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Bctc Devbook May13 Final Lowres

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Guidelines or DevelopmentNear Overhead Transmission Lines in BC

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC2

Project Overview

BC Transmission Corporation and BC Hydro 3

Characteristics o Transmission Towers 7

Designing Around Power Lines 9

Power Saety and Rights-o-Way Uses 23

Glossary 29

Frequently Asked Questions 33

Sources & Acknowledgements 35

 

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC3

BC Transmission Corporation (BCTC) and BC Hydro: “the Utilities”

BC Transmission Corporation (BCTC) was established in 2003 as the provincial Crown corporation to ocus on planning,

building, operating and maintaining a sae, reliable and cost-eective power grid. Electricity is delivered through an

interconnected system o more than 18,000 kilometres o transmission lines. This includes the management o 20,500 steel

towers, 100,000 wood poles and 287 substations.

BCTC is responsible or operating, planning and maintaining BC Hydro’s high-voltage electric transmission grid, and

BC Hydro retains ownership o the physical assets and the legal tenure or the rights-o-way. As the system asset owner,

BC Hydro acquires certain rights rom landowners (including private property owners, First Nations, municipalities and the

provincial and ederal Crown) to install, replace, maintain and access works related to the electrical delivery system. For the

transmission system, this is done in response to BCTC requirements. Because both utilities are involved in the management

o the right-o-way they are reerred to jointly as “the Utilities”.

Lands under transmission lines and towers

(generally reerred to as transmission acilities)

are usually owned by private landowners, while

the Utilities maintain specic rights governing

their use. These lands are called rights-o-way

(ROWs). The ROW agreements restrict owners’

rights to activities that do not impact public

saety, interere with the operation o the lines,

cause a saety hazard, or interere with the rights

granted. These agreements also usually allowthe Utilities to construct, maintain and replace

existing acilities, as well as reserve space or

uture acilities.

BC Transmission Corporation and BC Hydro

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC4

What is the purpose o this document?

 This document aims to promote the successul development o sites crossed by ROWs and the creation o well-

designed places. It demonstrates that a well-thought-out design approach can:

•  Successully incorporate the Utilities’ ROWs within developments

• Minimize the impact o overhead lines within a quality living environment

•  Integrate the growth o BC’s transmission system and communities in an eective way through partnership with

landowners, communities and developers

ROW containing two lines o 500kV transmission towers

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC5

Who will use this document?

 These guidelines are or the use o any individual interested in land

development near transmission acilities.

Property Owners

 These guidelines will assist property owners seeking to maximize

use o their land along the Utilities’ ROWs by providing a set o 

recommendations or appropriate land use and saety guidelines.

Local Government

 These guidelines will promote awareness o the potential to

develop and improve the environmental quality o land close

to transmission ROWs, and provide supplementary planningguidance on the development o ROWs. They also provide a

basis or analyzing and approving land development located

in close proximity to the Utilities’ acilities.

 Transmission lines across the City o Vancouve

Developers and Designers

 These guidelines will help provide clarity about the design constraints posed by transmission ROWs, along with greater

awareness o the opportunities to improve the environment and thereore the value o the development through good

design.

Communities

 This guide is a useul resource or communities planning or growth, because it provides guidelines or the successul

development o land close to high voltage overhead lines and within transmission ROWs.

BC Transmission Corporation and BC Hydro

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC6

BCTC’s transmission system crosses over 75,000 hectares

o land and consists o approximately 18,000 kilometres o 

transmission lines, 20,500 steel towers, 100,000 wood poles

and 287 substations.

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC7

Characteristics o Transmission Towers

 Transmission towers and lines they support are the most visible aspect o the Utilities’ inrastructure on the landscape. BCT

manages a wide variety o towers and lines that deliver electricity across the province. Three common types o towers are

shown below.

138 kV Wishbone Woodpole Structure230 kV Double Circuit

Aesthetic Steel Pole Structure500 kV Steel Lattice Structure

Characteristics o Transmission Towers

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC8

With eective planning and design,

transmission corridors can beneft landowners

and create better, more aesthetically pleasing communities.

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC11

Density

 The density o development can play a key role in screening views o the transmission acilities. By placing non-residential

buildings nearest to the transmission acilities, views o the line are screened rom most public and residential areas.

 

Higher density residential buildings close to transmission acilities may create a negative perception to the residents. The

lines may appear closer rom the upper oors o a multi-storey building.

It is important to create a harmony between density, alignment, orientation and landscaping in

order to create an aesthetically appealing development.

Alignment & Orientation

When developing new subdivisions and communities, varying the alignment o streets and paths can reduce the

number o views o transmission towers, minimizing their impact and reducing the impression o a linear corridor.

Buildings should be oriented to minimize direct views o towers rom residences. This can result in some developments

acing the overhead power lines, rather than the towers. The use o a ‘rectangular’ building block orm, oriented

perpendicular or at an angle to the lines, oers the opportunity to minimize direct views towards the transmission acilities,

thereby reducing the visual impact rom streets, buildings and gardens. This orientation is best suited or high- and

medium-density developments, usually in the orm o apartments and townhomes.

Orienting building blocks parallel to the transmission route could increase the numbers o homes with views o the line

and or higher voltage lines may cause problems with induced currents.

Designing Around Power Lines

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC12

Orienting building blocks parallel to the transmission route

could increase the numbers o homes with views o the line.

Alignment & Orientation

Buildings that are not square in orm provide the opportunity

to be oriented in many ways, avoiding direct views along the

transmission route.

Aligning homes between towers, as opposed to against towers along transmission corridors

helps to reduce the visual impact o tower lines.

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC13

Alignment & Orientation

 The orientation o homes parallel to the ROW does

little to minimize the visual impact o the lines rom

inside the homes, as in the rst diagram.

Locating cul-de-sacs on the edges o the right-o- way

and between towers minimizes the visual

impact o the towers and lines rom each single amily

dwelling, as in the second diagram.

ROW 

ResidentialLots

Designing Around Power Lines

Developments adjacent to ROWs can also be let open ended, with the resultant space

used to create public gardens, squares or parking lots.

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC14

Non-linear alignment o streets and roads provides opportunities to

minimize the view o power lines rom buildings.

Varying the lot angles and placement o buildings can greatly reduce the visual impacts o transmission lines.

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC15

Alignment & Orientation

By curving streets and paths, even with relatively small curves, you can signicantly reduce the visual impact o towers.

Views acing towards transmission lines can be oriented some distance rom the towers, and can also be ramed by new

street scenes and public open spaces, particularly where changes in topography occur.

 The arrangement o buildings, boundaries, ences, paths and landscaping in parallel with the transmission route over long

distances will tend to highlight the presence o overhead power lines and the linear nature o the route and will make them

more obtrusive.(Parallel structures to the ROW can also create induced currents). However, where one or more o these

elements is varied and is not parallel, the linearity o the transmission route and its overall prominence can be reduced.

Curved paths should also be angled to avoid ending visually at a tower, as below. This helps to reduce the visual impact o 

transmission towers.

Designing Around Power Lines

Let A street with an end point towards

a transmission tower gives prominence

to the tower.

Right By altering the street pattern, the

visual eect o the tower is minimized.

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC17

Landscaping & Screening

Landscaping is one o the most eective methods to diuse

the eects o transmission acilities, while transorming the

space within and adjacent to the ROW into an aesthetically

pleasing amenity to homeowners. Screening can enhance the

quality and intimacy o the immediate setting by creating the

perception that towers have receded into the distance.

Consideration should thereore be given to the use o 

screening in layers with varying heights to match site

circumstances. Mature trees planted along streets can

eectively screen views and enhance the residential

environment. Layers o planting create a series o silhouettesinto the distance, creating depth in the eld o vision that

helps to reduce the visual impact o the transmission acilities.

In this way, views o towers can be eectively screened

without the need or continuous belts o planting. Views o 

towers can be obscured or much o the year in areas where

the branches o mature trees arch over the street.

Street planting can be ‘retro-tted’ to existingenvironments to soten the visual impact o towers

and overhead power lines.

Appropriate low growing vegetation can be located withinthe ROW, while larger species can be planted near the edge

o the ROW. At the edge o the ROW, the species must be

planted ar enough rom the transmission acilities as not to

pose a threat to the acilities (swaying into the wires, etc).

Within the ROW, trees and shrubs generally cannot exceed

3 metres in height at maturity. The use o the ROW or

planting and gardening provides a valuable amenity to

individual landowners or communities, who may use the

ROW as a shared garden. The Utilities would need to be

consulted or such uses o the ROW.

Designing Around Power Lines

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC18

Let  In this image, the visual impact o power lines

is very strong, as l ittle attention has been paid to

varied orientation or the use o landscaping to ‘hide’

the towers.

Right  This image illustrates how screening and

landscaping can diminish the visual impact o power lines

in residential neighbourhoods.

A combination o cur ved streets,

rectangular building patterns,

landscaping and screening can

be seen in the example to the

let, while the ROW underneath

the lines has been developed into

community amenities.

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC19

Community Amenities Within the ROW

While use o the ROW has some restrictions (as per the statutory right-o-way agreements) the presence o long corridors

o clear, open space provides the opportunity to develop signicant private and community amenities. In order to best use

this space, it is important to consider design ideas such as:

• Breaking the transmission route into cells using roads, bridges, etc.

• Developing such cells or uses such as garden squares and parking lots

• Creating meandering paths and varied planting

• Providing a mix o activities beneath and adjacent to the overhead power line

Some examples o compatible uses within the ROW are

outlined in the next section. The process that the Utilities

use to review compatible ROW uses is outlined in a separate

document called Partners in Use, Rights-of-Way Guidelines for 

Compatible Uses. Developers should keep in mind that such

uses are site specic and would require prior approval rom the

Utilities, on a case-by-case basis.

Designing Around Power Lines

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC21

Nature and Conservation The retention or creation o nature conservation areas may be particularly suitable where public access to the area is

restricted or prevented. The trails shown ollow McLellan Creek and connect to HiKnoll Park nature conservation area in

Surrey and Brydon Lagoon in the City o Langley. These areas orm a part o the Cloverdale and Serpentine Greenway.

Fish habitat, HiKnoll Park, Surrey, BC

Serpentine Greenway, Surrey, BC

Circulation Paths Active recreation paths, roads, cycle paths and walkways may be

successully accommodated beneath high voltage overhead lines.

Design eorts should seek to orient the path or trail alignment at least

six metres away rom the Utilities’ acilities.

Christmas Tree Farms, Allotmentsand Community Orchards The use o land or allotments and community orchards may be

appropriate subject to maintaining saety, security and operational

clearances which are determined by the Utilities on a site-specic

basis, depending on transmission line voltage and tree species.

Designing Around Power Lines

Parking Secondary parking may be accommodated beneath high voltage

overhead lines subject to saety, security and operational concerns being

met. The Utilities need to review any proposed parking area on a site-

specic basis to ensure saety clearances rom vehicles to conductors.

Private GardensROWs on BC Hydro and Crown land adjacent to private land may be

licenced to extend private yards, enabling landowners to develop

gardens and planting patches.

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC23

Public Saety and Rights-o-Way Uses

When developing and designing land located close to transmission lines and

within ROWs, there are a number o actors related to public saety, acility

security, maintenance and design to consider.

Public Saety

Contact, or near contact, with high voltage equipment is extremely

dangerous and must be avoided. Objects that approach overhead electricity

conductors too closely can cause atal or severe shocks and burns. In order

to prevent such incidents, minimum saety clearances or all overhead

power lines are prescribed, which must be maintained between conductors

and the ground, trees, buildings, equipment and any other structures, suchas street lighting.

 The clearance required will depend on the operating voltage o the line, its

construction and design, the topography o the location over which the line

passes and the type o development proposed. The Utilities’ pre-approval is

required when unloading, stacking or moving material underneath conductors

and care should be taken in the construction o buildings or other structures in

the vicinity o an overhead power line.

Generally, buildings located outside o the ROW are sae rom any

o these concerns. However, buildings located at or near the edge

o the ROW may ace certain impacts rom electric eld induction.

 These impacts can be mitigated i they are better understood at the

time o the land development planning stage.

Nothing should ever be attached to a transmission tower or pole,

whether temporary or permanent. Storage or use o hazardous

materials is not permitted in or near ROWs. This includes anything

ammable, explosive, or corrosive.

Developers and municipalities need to consider emergency accessin the design o their developments where they plan to be adjacent to the right-o-way.

Sufcient access and maneuvering room or emergency equipment and trucks o the ROW, particularly or reghting

must be maintained. I a development adjacent to a ROW catches re, reghters need room to park vehicles, maneuver

ladders, and shoot water rom proper angles without putting themselves at risk rom the transmission system.

Public Saety and Rights-o-Way Uses

Public saety plays an

important role when

designing around

transmission inrastructure.

It aects not only the general

public, but the Utilities

maintenance sta as well.

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC24

Guidelines or Compatible Uses

 The Utilities have classied potential ROW uses as described below, to assist landowners and developers in designing or

ROWs. See the Compatible Use Guidelines or urther details:

http://www.bctc.com/the_transmission_system/rights_o_way_prop_rights/ 

 

Major impact

 The ollowing uses are considered to be “major impact” and must be coordinated by the utilities:

• Driveways, access roads, utility crossings

• Parking, playgrounds, tennis courts, gol courses, cemeteries, swimming pools• Gravel pits, quarries, ll, berms, and retaining walls

• Any activity involving elevation or grade changes more than 0.5 metres

• Sewage disposal elds, detention/retention ponds, watercourse relocation

• Portions o non-habitable buildings (e.g. garages, carports)

• Highways, roads and major pipelines parallel to and/or within the ROW

• Street lamps and other lighting standards

• Any activity involving any type o mechanized equipment (e.g. excavators, bulldozers, irrigation systems)

 

Reueling within the ROW is not recommended, and in many ROW agreements it is specically prohibited. In the interest osaety, users should contact the Utilities beore proceeding with these kinds o activities.

No signifcant impact

 The ollowing uses are considered to have “no

signicant impact” and do not require specic

permission rom the Utilities:

•  General landscaping and residential gardens,

provided there is no change in grade and

vegetation has a maximum height o 3 metresat maturity

•  Grazing o animals and agricultural uses (without

mechanical irrigation systems or metallic ences)

Minor impact

 The ollowing uses are considered to have “minor

impact” and should be reviewed by the Utilities prior

to development:

•  Tree arms and other multi-year crops

• Hiking and equestrian trails, paths and walkways

• Small garden sheds and storage o non-hazardous materials

• Non-metallic water and sewer lines, septic elds

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC25

1. Induced CurrentsLandowners and developers should be aware o the potential or nuisance and startle shocks (caused by induced voltage)

that can occur when someone comes in contact with a large conductive object (eg. a vehicle, building or even encing)

located on or o the right-o-way. These shocks are known as ‘nuisance’ or ‘startle’ since they will not physically hurt

someone, but will be noticed by some people and provoke a startle reaction.

 These touch currents occur when a grounded individual touches an ungrounded object while standing in an Electric Field

(e-eld). Conductive objects when placed in an e-eld attract a charge, and a person touching that object can experience

an annoying or startling shock when a person’s body provides a path to ground or the current to ollow.

 There are many actors which inuence the likelihood o nuisance shocks and the extent that people will notice them. These include:

• Line voltage

• Conductor to ground clearance

• Size o the vehicle or object

• Location on or o the right o way

• Atmospheric conditions

• Personal physiology

Electric elds emanate rom any conductor or wire that carries voltage. Higher line voltages produce higher electriceld strengths. The closer the conductor is to the ground, the higher the eld strength beneath it tends to be, and the

increased possibility o shocks.

Larger objects such as a building or a large vehicle have the capability o a larger charge and thereore the shock could be

more noticeable. Backyard metallic objects such as swings, portable grills and lawnmowers have been known to deliver

similar shocks. Ungrounded metal wire ences can also receive sufcient charges to cause nuisance shocks.

Maintenance Needs

When transmission lines are built, the poles or towers are placed on sites which

have clear routes to allow maintenance crews to gain access to them. Changing

land use and the expansion o subdivisions cannot be allowed to impede access

to poles or towers.

When planning uses within the ROW, it is important to consider maintenance

requirements. Transmission lines and towers require a minimum o six metres o 

clearance on all sides to ensure sae access or maintenance workers.

Public Saety and Rights-o-Way Uses

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC26

During building construction, workers have also received shocks when installing ungrounded gutters and downspouts on

structures built close to the edge o the right-o-way. Homeowners may also experience shocks when cleaning gutters i 

the gutters are not properly grounded. Call the BC Hydro provincial rights-o-way help desk (1-800-667-1517) i you need

advice or want assistance in properly grounding metal objects.

New Construction

 To date, no buildings exceeding two storeys in height have been placed immediately at the edge o a 500kV transmission

right-o-way in British Columbia. Such buildings may be subject to electric elds because o their height, length, orientation

and their proximity to the transmission lines. Accordingly, owners or developers should retain a proessional consultant

with expertise in calculating electric and magnetic elds, mitigation strategies, and saety issues during construction and

ater occupancy. Consultants can advise on the project design and anticipated construction methods.

It’s important to remember that even startle shocks could pose saety issues to construction workers or residents,

depending on the activities in which they are engaged.

Let A low rise residential structure

located at the boundary o the ROW

meets the requirements.

Right A medium rise residential

structure located on the boundary o 

the ROW meets the requirements, but

can create induced currents, as the

upper levels o the building are close

to the Utilities’ acilities.

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC27

Top A tall building located at the boundary o the

ROW meets the requirements, however it poses a high

risk o induction as the upper levels o the building are

closer to the Utilities’ acilities.

Public Saety and Rights-o-Way Uses

Based on past experience, we have ound it is important to:

1. Maintain the perpendicular orientation o the buildings with respect to the 500 kV conductors.

2. Bring the electric service to the buildings in rom a dedicated distribution transormer with individual eeds kept

perpendicular to the 500 kV conductors (metallic underground services should also be oriented perpendicularly).

3. In all construction projects near 500 kV transmission lines, engage a consultant knowledgeable in the calculation

and management o electric elds.

Fences and Metal Clothes Lines

In general, ences can be constructed near transmission lines. However, the ollowing saety precautions should be observed.

•  Metal ences should not be attached to any tower or conductive pole

• Metal ences should not be constructed within ve metres o any tower or conductive pole o a transmission line

•  Metallic objects such as metal clothes lines should not be connected to poles or towers. I lightning or an

electrical lash hits a pole or tower, momentary high currents and voltages could create a risk o electrocution

•  Metal ences running parallel to the transmission acilities may need to be grounded at intervals to reduce

nuisance shocks

Bottom An alternative approach to high rise

development that allows or increased density but

mitigates induced currents.

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC28

2. Electric and Magnetic Fields (EMF) Power requency (also reerred to as extremely low requency

or ELF) electric and magnetic elds are present everywherethat electricity ows. All electric wires, and the electrical devices

they supply, such as light bulbs, households appliances, and

computers, are sources o electric and magnetic elds. Scientists

have been researching EMF and possible health eects or more

than 30 years and this extensive research has not established a

link between health risks and EMF. Leading health authorities

say there is no reason to be concerned about exposure levels

in typical Canadian homes and workplaces, regardless o the

proximity to power lines.

We realize that, regardless o the view o health authorities,some individuals have a dierent view. I people have any

concerns we encourage them to visit the BCTC website and

investigate the issue.

3. Noise rom LinesIn calm and dry conditions transmission lines normally make little noise, however, some typical sounds can include:

•  a buzzing sound rom damp or salt-polluted insulators

•  a humming noise rom conductors and/or tower steelwork, especially during very windy periods

4. Radio and Television IntererenceRadio and television intererence can be the result o various electrical appliances or objects. BC Hydro has a guide

to identiying the sources o such intererence, and homeowners should contact the BC Hydro provincial rights-o-

way help desk (1-800-667-1517) i they are having reception problems.

Reer to the BCTC inormation sheet on

EMF or search EMF at:

http://www. bctc.com

Where can I fnd moreinormation on EMF?

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC29

Glossary

Agreement

An act in law whereby two or more persons declare their consent as to any act or thing to be done.

Cable

Generally reers to an underground “cable” suitably insulated, used or transmitting electricity.

Compatible Use (Secondary Use)

Any use in a right-o-way other than a utility’s use or the transmission o electricity which does not compromise the utility’s

criteria or saety o people, security or its works, and exibility or maintenance and uture works. Examples o compatible

use are gol courses, agricultural grazing land, and Christmas tree arms.

ConductorWire strung between poles or towers, used or transmitting electricity.

Crown Land

Property owned or under the jurisdiction o the Provincial or Federal Government.

Distribution

Power lines less than 60 kV.

Easement

An interest in land owned by another that entitles its holder to a specic limited use or enjoyment. A statutory right o way

is a orm o easement.

Electrostatic Induction

A voltage / current induced in an object due to the electric eld surrounding an energized powerline.

Electric and Magnetic Fields

 Two distinct orms o energy. Electric elds are created by the presence o voltage in a conductor. They exist around

energized wires, even i equipment is turned o. Magnetic elds are created by current (that is the ow o electrons)

through a conductor. They exist only when equipment is turned on and current is owing. In short, electric elds are

associated with voltage and magnetic elds are associated with the amount o current being used.

Encroachment

A xture, such as a pool, a ence, a building or a porch, which is located within a right-o-way that does not have a util ity’s

consent or right to be there.

Fee Simple

Full ownership o land subject to existing charges on the registered deed. The owner assumes all relevant obligations (e.g.

payment o taxes, public liability, etc.)

Glossary

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC30

Glossary (continued)

Field Strength

 The strength o an electric eld, measured in volts per metre or o a magnetic eld measured in gauss.

Hazard Trees

A tree which is deective, has a “target” (where it is likely to hit or damage a person or object when it ails), and has the

imminent potential to ail.

Legal Survey

Requires a eld survey and preparation o a plan by a registered certied British Columbia Land Surveyor.

Reliability

With regards to an electric power system, the degree to which the perormance o the elements o that system results inpower being delivered to consumers within accepted standards and in the amount desired. A measure o the continuity o 

electric service over a long period o time.

Right-o-Way (ROW)

A term to describe limited interests in land which provide the right to utilize the property, or specic purpose(s), without

having ull ownership. Limited interests are dened by statutory rights-o-way, lease, licence, permit or letter agreements.

Rights or Access

Construction or Permanent Access

A right granted to enter onto lands outside the statutory right-o-way or the purpose o construction or maintenance

o a utility ’s works. Generally, access to towers, poles, guys, etc. is obtained along the statutory right-o-way. However,

in situations where an alternate access is required across vacant Crown land or private property, temporary during

construction and permanent rights or maintenance are obtained through a separate agreement.

System Security

 The ability o the bulk power electric system to withstand sudden disturbances such as electric short circuits or

unanticipated loss o system components.

Statutory Right-o-Way

A right belonging to a party to pass over the land o another. A statutory right-o-way is a right granted by statute to

negotiate or easements without a dominant tenement. A limited interest in land is acquired which is registered in the Land Title Ofce against the ee simple title. The limited interests obtained through this orm o agreement are dened within

the right-o-way document. The owner o the property retains the rights and benets or ownership. Statutory rights-o-

way are used by utility companies, government agencies, Crown corporations and local governments or the purposes o 

constructing linear works such as highways, railways, pipelines, transmission lines, water and sewer lines.

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Guidelines or DevelopmenNear Overhead Transmission Lines in BC31

Glossary (continued)

Step & Touch Potential

A potential dierence or voltage gradient set up in the ground as a result o a ault current. Persons walking would

experience a voltage between their eet (step potential). Persons touching a grounded object with their hands would

experience a voltage between their hands and eet (touch potential).

Substations

 Transorming or switching stations to control the voltage and direction o electricity. They reduce the voltage to lower

levels or distribution. Switching controls the direction o electricity and ensures ault protection.

Transmission

Circuits categorized 60 kV and above are reerred to as transmission (e.g. 138 kV, 230 kV, 360 kV, 500 kV). Circuits operating at

60 kV are reerred to as “subtransmission” and may supply bulk customers directly. In some areas o BC, the sub-transmissionvoltage is at 138 kV. 230 kV is the backbone o BC Hydro’s urban transmission system. Overhead lines are usually built on

steel towers or steel poles, although wood poles are common in rural areas. 500 kV is the major bulk transmission voltage.

Overhead lines or 500 kV are only built on steel towers.

Underbuild

When distribution circuits (<60 kV) are located on the same overhead pole as some sub transmission circuits (60 kV, 138 kV)

Distribution circuits are usually situated underneath the sub transmission circuits.

Upgrading

Improving the quality or the standard o a line without increasing its capability.

Uprating

Increasing the power carrying capability o the line by improvement in clearance, replacement with a larger conductor or

operating the line at a higher voltage.

Vegetation Management

 The activity o controlling tree growth by using various techniques including pruning, tree removal, herbicides, and

biological means.

Glossary

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Frequently Asked Questions and Further Ino

Where can I see a copy o my right-o-way Agreement?

Property owners wishing to see a copy o their statutory right-o-way document should contact their local Land Title Ofce.

More inormation can be ound at: www.ltsa.ca/land-title/land-title-ofces/ 

Where can I fnd more inormation about compatible uses or rights-o-way?

You can nd more inormation about ways to implement compatible uses in the document Partners in Use, Rights-o-Way

Guidelines For Compatible Uses, available rom www.bctc.com

Who can I consult about developing near a right-o-way or implementing a compatible use?

 To learn more about developing near a right-o-way or to consult the Utilities about applying or compatible use, please

contact the BC Hydro Properties Division at:

  BC Hydro Properties Division

12th Floor, 333 Dunsmuir St.

Vancouver, BC V6B 5R3

Phone: 1.800.667.1517 or in the Lower Mainland 604.623.3637

Fax: 604.623.3988

Email: [email protected]

For additional inormation, please visit our website at www.bctc.com or BC Hydro at www.bchydro.com

Frequently Asked Questions

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Sources

Appleyard, Donald, The View rom the Road, MIT Press, Cambridge, Mass., 1964

BC Hydro and BC Transmission Corporation, Rights o Way Guidelines or Compatible Use

Jacobs, Allan B, Great Streets, Cambridge, Mass.: MIT Press, 1993

National Grid UK, Sense o Place: Development or Guidelines Near High Voltage Lines

 Transpower New Zealand, Landowners Booklet: General inormation or landowners and those living, working or playing

near transmission lines

Unwin, Raymond, Town Planning in Practice: An Introduction to the Art o Designing Cities and Suburbs, Princeton

Architectural Press, New York, 1994.

Acknowledgements

BCTC wishes to acknowledge the assistance o a number o individuals that have contributed to this document.

Robert Dykstra, Area Planning & Development, City o Surrey

Ron Hintsche, Senior Planner/Approving Ofcer, City o Abbotsord

David Walsh, Team Lead – ROW Control, BC Hydro

Mike Prettejohn, Acting Manager, Property Rights Services, BC Hydro

Kim Proudlove, Property Representative, Property Rights Services, BC HydroLaura Lee Richard, MCIP, Editor, Planning West, Planning Institute o British Columbia

Hector Pearson, National Grid Transco, UK 

National Grid, UK, Sense o Place: Design guidelines or development near high voltage overhead lines.

(the inspiration or these guidelines)

 The principal authors o this document are:

Gary Holisko, M.A., MCIP, Manager Land Management Programs, BCTC

Farhad Mawani, consultant

Josh Bassett, consultant

Sources & Acknowledgements

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www.bctc.com


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