DOW RESTRICTED - For internal use only EWP-13 Elevated Equipment Near Power Lines (US Requirements)...

DOW RESTRICTED - For internal use only

EWP-13 Elevated Equipment Near Power Lines (US

Requirements) June 24, 2011

Global Electrical Safety and Maintenance TRN

DW Hull


Learning Objective• This Electrical Work Practice defines the safety requirements in the

U.S. for lift work or any activity near power lines or fixed energized parts of a transmission or distribution system up to 350 kV. For voltages above 350 kV, consult your Electrical DAS.

• Purpose: To protect personnel from electrical shock, electrocution and to prevent process safety incidents due to physical damage of power lines while assembling the lift equipment, disassembling the lift equipment, or performing lift work or any activity near the power lines. This work practice applies to any vehicle or mechanical equipment capable of having parts of its structure elevated near energized overhead lines or fixed energized parts of a transmission or distribution system.


EWP-13 Lift work near Power Lines

Applicability • This work practice establishes the minimum safety requirements for both insulated and

uninsulated power lines of any voltage, up to 350 kV, where it is possible for any part of the lift equipment, load line or its load is near or may become too close (i.e. within 20 feet or 6.1 meters) to energized electrical power lines or other energized parts.

• Un-insulated power lines may be bare, weather-protected or covered conductors.

Typical bare conductor power lines Un-insulated weather protected power lines

Un-insulated switches, fuses and cables


Examples of lift equipment (more than cranes!)

EWP-13 applies to any lift equipment that has parts that can be elevated.


Examples of applicable lift equipment

• Dedicated pile drivers• Service/mechanic trucks with

a hoisting device• Crane on a monorail• Tower cranes (such as fixed jib

(“hammerhead boom”), luffing boom and self-erecting)

• Pedestal cranes• Portal cranes• Overhead and gantry cranes• Straddle cranes• Sideboom cranes• Derricks• Dump Trucks• Concrete Pumping Trucks

. . . and variations of suchequipment.

• Articulating cranes (such as knuckle-boom cranes)

• Crawler cranes• Floating cranes• Cranes on barges• Locomotive cranes• Mobile cranes (such as wheel-mounted, rough-

terrain, all-terrain, commercial truck-mounted, and boom truck cranes)

• Multi-purpose machineswhen configured to hoist and lower (by means of a winch or hook) and horizontally move a suspended load

• Industrial cranes (such as carry-deck cranes)



Does not apply to:• Power cables

installed in cable trays, armored or metal clad cables, enclosed bus ducts, or cables protected by shields, drain wires or conduit.

Power cables in cable tray – Avoid contact with cable tray or cables with lift equipment.



Does not apply to:• Energized electrical power lines

when working from an aerial device (such as an insulated bucket truck) and the work is performed by Electrical Skilled Persons. For example, telecommunications employees, line-clearance tree trimming employees, electric utilities employees,

• Power lines that have been de-energized and are visibly grounded at the work / lift site.

Example: EWP-13 does not apply to insulated lift/boom equipment used

by Electrical Skilled Persons.



Does not apply to lifts:• Where the lift equipment is assembled, disassembled and/or operated:

– with the boom fully extended and, – with the boom having 360 degrees of rotation at any boom angle and, – where any part of the lift equipment, hoist line, slings, tag lines or loads

are always greater than 20 feet from the power lines.

Load

Boom fully extended if hydraulic extendable

Control Clearance Rotation

Radius

Top View:

Power line

20ft



Does not apply to lifts:

Where equipment with non-extendable booms: The uppermost part of the equipment, with the boom at true vertical, would be more than 20 feet below the plane of the power line.


General Requirements

The following requirements are for all assembly, disassembly and operations of lift equipment


General Requirements• The person responsible (director, foreman, supervisor,

etc.) for assembly and disassembly of the lift equipment and/or lift operations must determine if any part of the lift equipment, load line, load, rigging or accessories could get closer than 20 feet (6.1 meters) to a power line during the assembly, disassembly and lift operations. – Note: This includes other lift equipment, tools or vehicles that may

be use to assemble or disassemble the primary lift equipment.

• All power lines are to be considered energized unless it has been confirmed by the utility owner/ operator, who is an Electrically Skilled Person with respect to electrical power transmission and distribution, as de-energized and are visibly grounded at the work site.


General Requirements• All power lines are presumed to be un-insulated unless the utility

owner/ operator who is trained with respect to electrical power transmission and distribution or an Electrically Skilled Person who is trained with respect to electrical power transmission and distribution confirms that a line is insulated.

• Voltages of the power lines must be known prior to lift equipment transit, assembly, disassembly or operation.

• Barricades shall be used to restrict access to the lift equipment while lift operations are taking place. Barricades shall be at a minimum 10 feet (3 meters) from the lift equipment. Only personnel essential to the lift operation are permitted to be in the area of the crane and load during lift equipment operation.

– Where obstacles prevent the barricade from being at least 10 ft away, the barricade must be as far away from the lift equipment as feasible.


Lift Equipment In-Transit Requirements

The following requirements are for moving Lift Equipment.


Requirements: Lift Equipment In-Transit

Voltage (nominal, kV, alternating

current)

While Traveling – Minimum clearance

distance to un-insulated conductors

Clearance in feet

Clearance in meters

up to 0.75 4 1.22

over .75 to 50 6 1.83

over 50 to 345 10 3.05

When lift equipment is in transit, the boom or elevated parts must be lowered and its upper most parts clearance to un-insulated power lines must be:

If power lines are insulated as determined by the utility representative or an Electrical Skilled Person, prevent contact so as not to damage the line.

Un-insulated power lines

Insulated power lines Upper most parts

Table T



• A dedicated spotter is required if, any part of the equipment while traveling, including “pick and carry”, will get closer than 20 feet (6.1m) to un-insulated power lines. The dedicated spotter must be in continuous contact with the driver/operator of the lift equipment. The dedicated spotter must:

– Be positioned to effectively gauge the clearance distance.

– Where necessary, use equipment that enables the dedicated spotter to communicate directly with the operator.

– Give timely information to the operator so that the required clearance distance can be maintained.

Un-insulated power linesInsulated power lines

Upper most parts

Spotter Operator

Direct communications may be verbal at short distances, by dedicated radio communications or by other means.

Upper most parts


Requirements: Lift Equipment In-TransitLift equipment in transit is prohibited

where un-insulated or insulated power lines cannot be seen or in conditions of reduced visibility, unless a safe path of travel is identified and used. Examples are but are not limited to fog, heavy rain, heavy snow, smoke, haze, poor illumination at night, etc.

The effects of speed and terrain on equipment movement (including movement of the boom/mast) must be considered so that those effects do not cause the minimum clearance distances specified in Table T to be breached.



• Standard heights/clearances for all power lines shall be established and documented by the site. Clearance signs shall be installed for power lines crossing over roadways or equipment access lanes in situations where the height/clearance are “non-standard”. The clearance sign shall indicate the height of the power lines from grade level and voltage.

• Lift equipment in transit shall not contact insulated power cables or insulated communication cables.

EXAMPLE


Lift Equipment Assembly, Disassembly, and Operations - Insulated Power Lines

The following requirements are for assembly, disassembly and operation of lift equipment near Insulated Power Lines


Lift Equipment Assembly, Disassembly, and

Operations - Insulated Power Lines A planning meeting must be conducted prior to the positioning and operation of

lift equipment within 20 feet of insulated power lines. This meeting is a pre-job discussion between the individuals involved in the job and must address:

– Job scope.– Verification by a utility owner/ operator / representative who is trained with respect to

electrical power transmission and distribution or an Electrically Skilled Person who is trained with respect to electrical power transmission and distribution has confirmed the line is insulated

– Precautions needed to prevent contact of the lift equipment with the insulated power line. Either of the following requirements must be met:

• An individual designated solely to observe and maintain direct communication with the lift equipment operator to prevent contact during lift equipment positioning and during lift operations. The individual can have other duties while the lift equipment is in position but is not operating, or

• Insulated power lines are treated as un-insulated and the requirements in this work practice must be followed for un-insulated power lines.


Lift Equipment Assembly, Disassembly, and

Operations - Insulated Power Lines

• Un-insulated power lines that have been covered by insulating barriers, are not considered insulated and must be treated as un-insulated.


Lift Equipment Assembly and Disassembly. Un-insulated Power Lines

The following requirements are for assembly and disassembly of lift equipment near un-insulated Power Lines



• The person responsible (director, foreman, supervisor, etc. ) for assembly of the lift equipment or disassembly of lift equipment must determine if any part of the lift equipment, load line, load, rigging or accessories could get closer than 20 feet (6.1 meters) to an un-insulated power line or other un-insulated energized parts during the assembly process or disassembly process.

– Note: This also includes other lift equipment, tools or vehicles that may be use to assemble or disassemble the primary lift equipment.



Methods acceptable for assembling or disassembling the lift equipment near un-insulated power lines are listed below in order of preference:

a) OPTION 1. De-energize and visibly ground the power line at the work / lift site. The owner of the power line must determine that it is infeasible to de-energize and ground the power line before proceeding with other options below.

Typical Power Line Grounding



Infeasible to de-energize and ground the power line means:

– Introduces additional or increased hazards to the power user(s), facility or site. Examples are:» Interruption of life support systems, » Deactivation of emergency alarm systems, » Shutdown of hazardous site ventilation equipment

or other needed emergency systems, » High probability for the release of hazardous

chemicals or dangerous uncontrolled chemical reactions.



Methods acceptable in order of preference con’t:b) OPTION 2. Maintain a 20 foot (6.1 m) clearance to the

power lines.

c) OPTION 3. Utilize Table 1. Control Distance/Clearance.

Voltage (nominal, kV, alternating current)

Minimum clearance distance

Clearance feet Clearance meters

up to 50 10 3.05

over 50 to 200 15 4.57

over 200 to 350 20 6.10

Table 1. Control Clearance for EWP-13



• Where Option 2 or Option 3 is used, all of the following must be met.– Conduct a planning meeting with the operator and the other workers who will be in the

area of the equipment or load to review the location of the power line(s), and the steps that will be implemented to prevent encroachment/ electrocution. Use of Attachment 1 or other forms with the same content will meet this requirement.

– If Tag lines are used, they must be non-conductive.– Implement at least one of the following:

• Use of mechanical restraints to limit lift equipment movement.• Use of proximity alarms to alert the lift equipment operator of encroachment.• A device that automatically warns the operator when to stop movement, such as a range control

warning device. Such a device must be set to give the operator sufficient warning to prevent encroachment.

• A device that automatically limits the range of lift equipment movement, alarms, and is set to prevent encroachment.

• An insulating link/device, rated for the voltages involved and rated for the load weight, must be installed at a point between the end of the load line (or below) and the load.

• Use of a dedicated individual/spotter to be positioned to effectively gauge the clearance distance,, communicate timely information and communicate directly to the lift equipment operator to maintain the required clearance distance. The dedicated individual/spotter shall be in continuous contact with the lift equipment operator and one or more forms of visual aid methods must be used to mark the limits of lift equipment movement is required. Examples are but not limited to:

– Painting on the ground or on a line of stanchions – Hot stick with flags and/or barricade tape.– Flags



•Assembly or disassembly of lift equipment (including load line, rigging and lifting accessories) below un-insulated energized power lines is prohibited unless the power lines are de-energized and visibly grounded at the work site.

•Assembly or disassembly of lift equipment (including load line, rigging and lifting accessories) within / closer than the distances given in Table 1 of un-insulated energized power lines is prohibited.

Voltage kV, Minimum clearance distance


up to 50 10 3.05

over 50 to 200 15 4.57

over 200 to 350 20 6.10



Lift Equipment Operations. Un-insulated Power Lines

The following requirements are for operation of lift equipment near un-insulated Power Lines


Lift Equipment Operations Un-insulated Power Lines

Step 1:• Identify the work zone by either:

– Demarcating the boundaries with:• Flags, signs or painting on the ground or on a line of

stanchions, fiber glass sticks with flags or barricade tape, orange cones, etc or

• Use of a range limiting device to limit movement only within the work zone or

• Use of a range control warning device to limit movement only within the work zone and

• The operator is prohibited from operating the lift equipment past the established work zone boundaries.

• Defining the work zone as the area 360 degrees around the lift equipment, up to the equipment maximum working radius.



Step 2:

• The person responsible (director, foreman, supervisor, etc.) for the lift operation must determine if any part of the lift equipment, load line, load, rigging or accessories could get closer than 20 feet (6.1 meters) to a power line or other energized parts if operated up to the equipment’s maximum working radius in the work zone. If so, one of the following options must be implemented:

– (Option 1) De-energized and visibly grounded the power line at the work / lift site. The owner of the power line must determine that it is infeasible to de-energize and ground the power line before proceeding with other options below.

– (Option 2) Maintain a 20 foot (6.1 m) clearance to the power lines.– (Option 3) Utilize Table 1. Control Clearance.– (Option 4) Utilize Table 2. Control Clearance – Lift work under the

safety observation of an Electrical Skilled Person. See Attachment 2.



• Where Option 2, Option 3, or Option 4 all of the following must be met.

– Conduct a planning meeting with the operator and the other workers who will be in the area of the equipment or load to review the location of the power line(s), and the steps that will be implemented to prevent encroachment/ electrocution. Use of Attachment 1 or other forms with the same content will meet this requirement.

– If Tag lines are used, they must be non-conductive.– Erect an elevated warning line, barricade, or line of signs, in

view of the operator, equipped with flags or similar high-visibility markings.

• If the operator is unable to see the elevated warning line, a dedicated spotter must be used.



• AND Where Option 2, Option 3, or Option 4 is used, Implement at least one of the following:

– Use of mechanical restraints to limit lift equipment movement.– Use of proximity alarms to alert the lift equipment operator of encroachment.– A device that automatically warns the operator when to stop movement, such as

a range control warning device. Such a device must be set to give the operator sufficient warning to prevent encroachment.

– A device that automatically limits the range of lift equipment movement, alarms, and is set to prevent encroachment.

– An insulating link/device, rated for the voltages involved and rated for the load weight, must be installed at a point between the end of the load line (or below) and the load.

– Use of a dedicated individual/spotter to be positioned to effectively gauge the clearance distance,, communicate timely information and communicate directly to the lift equipment operator to maintain the required clearance distance. The dedicated individual/spotter shall be in continuous contact with the lift equipment operator and one or more forms of visual aid methods must be used to mark the limits of lift equipment movement is required. Examples are but not limited to:

• Painting on the ground • Flags or painting on a line of stanchions • Clear line of sight landmarks that have been flagged or painted• Flags.



• If Option 4 is used, Attachments 2 and 3 MUST also be used. Note: Attachments 2 and 3 contain mandatory requirements not listed else where in this training.

• Operation of lift equipment (including load line, rigging and lifting accessories) below un-insulated energized power lines is prohibited unless the power lines are de-energized and visibly grounded at the work site except as provided by Option 1.

• Operation of lift equipment (including load line, rigging and lifting accessories) within / closer than the distances given in Table 2 of un-insulated energized power lines requires the approval of the Electrical DAS and all the requirements in Attachments 1, 2, and 3 must be met..


Equipment Requirements for Lift Equipment near Power Lines

The following are equipment requirements are for operation of lift equipment near Power Lines or other energized parts.


Equipment Requirements for Lift Equipment near Power Lines

• The use of lift equipment in which the boom is designed to free fall (live boom) is prohibited where the load or boom is directly over a power line, or over any part of the area extending the Table 1 clearance distance to each side of the power line, or any part of the area extending the Table 1 clearance distance to each side of the power line is within the radius of vertical travel of the boom or the load. Examples:

Live boom is prohibited since boom will contact the power line if it free falls

Live boom is prohibited since boom will penetrate clearance distance if it free falls

Live boom is prohibited since load will contact the power line or penetrate the clearance distance if it free falls


Lift Equipment Contact to Power Lines

This section describes the hazards and how to avoid these hazards if the lift equipment contacts a power line.


Contact with Power Lines Step and Touch Potentials

• Lift equipment contact with a un-insulated power line (or an insulated power line that has been damaged by lift equipment contact) will cause the lift equipment, line and loads to become energized with a very high level of “short” circuit current flowing through the lift equipment and through the earth/ground.

• If the lift equipment comes in contact with a energized power line and– You touch the lift equipment or its attachments (line, load, etc.)

while standing on the ground your body will become part of the electric circuit and be subject to electrical shock, injury or electrocution.

– Your stride or distance between your feet (or step potential) will also place you in the electrical circuit and you will likely be subject to electrical shock, injury or electrocution.


Contact with Power Lines Touch Potential (Voltage)Contact to

Power Line

Touch Potential or Voltage:

Hands (or other part of the body i.e. forearm, elbow, etc.) and feet are at different voltages that causes a current to flow through the hand and exit the feet. The current path is through the torso (i.e. the heart) and serious injury or death may result.

The difference of voltage is caused by contact of the lift equipment or it’s parts (line, load, etc) to an energized power line and the resulting “short” circuit current flow through the earth/ground.

LOAD

Short circuit current


Contact with Power Lines Touch Potentials (Voltage)Contact to

Power Line

Mitigation Requirements:

• Persons on the ground shall not touch or approach the lift equipment. The lift equipment structure, load lines and load will be energized and a hazardous touch potential / voltage exist.

• If tag lines are used, they must be non-conductive.

• Dry polypropylene, nylon, etc.

• Metallic, conductive or cables, wet ropes, chains and the like shall not be used.

LOAD

Short circuit current


Contact with Power Lines Touch Potentials (Voltage)

Additional Mitigation Requirements:

Where Control Clearance is less than that in Table 1 but greater than Table 2.

1. Use of an insulating link/device, rated for the voltages involved, must be, installed at a point between the end of the load line (or below) and the load.

2. Non-conductive rigging must be used.

3. The lift equipment must be grounded. This ground must meet the same current handling and voltage rise limitation requirements as a Personal Protective Ground (see EWP-33).

33 KV Insulating

Link


Contact with Power Lines Step Potential (Voltage)

LOAD

Contact to Power Line

“Short” circuit current

Step Potential or Voltage:Where the voltage between the feet are different. This difference in voltage will cause current to flow up one foot and leg then out the other and may result in serious or fatal injury.

The difference of voltage is caused by contact of the lift equipment or it’s parts (line, load, etc) to an energized power line and the resulting “short” circuit current flow through the earth/ground.

Keep your feet close together! Shuffle walking or heel to toe movement shall be used to reduce this risk.

You do not need to be in contact with the lift equipment or it’s parts to be injured by step potential. All that is required is sufficient current flow through the earth/ground and sufficient space between your feet.


Contact with Power Lines• In the case of lift equipment contact

with energized power lines or other energized parts con’t:

– All personnel shall proceed away from the lift equipment to designated assembly areas by keeping feet as close together as possible (shuffle walking or heel to toe) and keeping hands at the side. Avoiding touching anything with the hands. DANGER! A step potential or voltage will exist along the surface of the ground, and if one uses a larger walking stride, can cause current to flow between the feet or if touching another object, between the feet and hands (or any other part of the body).

Guidance: The designated assembly area should be at minimum 33 feet (10 meters) away from the work zone.


Contact with Power Lines

• In the case of lift equipment contact with energized power lines or other energized parts: – The lift equipment

operator should remain in the cab unless there is an imminent danger of fire, explosion or the emergency that dictates evacuation of the cab.

The metal cab (and crane structure) surrounding the operator, will conduct the current more easily than a human body -- i.e. current will flow around the structure and not through the operator. The metal cab acts as an equal potential surface and the hands, feet and other parts of the body are at equal voltage, therefore current cannot flow through the body.


To Earth /Ground



• In the case of lift equipment contact with energized power lines or other energized parts con’t: – Where lift equipment

operator evacuation is needed, jump clear from the last step of the stairs or ladder, and land with both feet together and without simultaneously touching the lift equipment with any part of the body and the ground.


To Earth /Ground



• In the case of lift equipment contact with energized power lines or other energized parts con’t: – The lift equipment operator

should attempt to disengage lift equipment contact with the power line.

Recommendation: Select an evacuation route from the lift equipment, considering a route as far as practical from fuel and oil tanks/sources.

Prolonged “short” circuit current flow may result in ignition of fuel and oils, thus creating additional hazards.


Attachment 1. Pre Task Hazard Assessment for Lift Equipment Assembly, Disassembly and Operations Less Than 20 Feet From Un-insulated Power Lines*

Location:________________________________________ Date:_________Safe Work Permit Number/ID: ___________________Scope of work / lift activity:__________________________________________Lift Crew Director/Supervision/Crew Leader_____________________________

Use this check list for each activity i.e. use for assembly, use for operations, and use for disassembly. Other procedures or checklists may be used if they contain equivalent information.

ItemCompleted (Y/N)

1 Determine and record power line voltage __________kV

2 Determine and record minimum clearance distance (Table 1) ________ft/m

3 Work zone is demarked. Lift equipment operation past the work zone boundaries is prohibited.

4 The locations of the un-insulated power lines or energized parts are known to all lift crew members.


Attachment 1. Pre Task Hazard Assessment for Lift Equipment Assembly, Disassembly and Operations

Near Un-insulated Power Lines*5 Steps are to be taken to prevent encroachment into the power lines. One or more shall

be used:1. Use of mechanical restraints to limit lift equipment movement.2. Use of proximity alarms to alert the lift equipment operator of encroachment.3. A device that automatically warns the operator when to stop movement, such as a

range control warning device. Such a device must be set to give the operator sufficient warning to prevent encroachment.

4. A device that automatically limits the range of lift equipment movement, alarms, and is set to prevent encroachment.

5. Use of an elevated warning line, barricade, or line of signs, in view of the operator, equipped with flags or similar high-visibility markings.

6. Use of a dedicated individual/spotter to be positioned to effectively gauge the clearance distance,, communicate timely information and communicate directly to the lift equipment operator to maintain the required clearance distance. The dedicated individual/spotter shall be in continuous contact with the lift equipment operator and one or more forms of visual aid methods must be used to mark the limits of lift equipment movement is required. Examples are but not limited to:o Painting on the groundo A line of stanchions o Clear line of sight landmarks that have been marked or paintedo Flags

* Use of an elevated warning line, barricade, or line of signs is required for lift operations in conjunction with at least one other encroachment prevention steps listed.


Attachment 1. Pre Task Hazard Assessment for Lift Equipment Assembly, Disassembly and Operations

Near Un-insulated Power Lines*

6 Barricades used to restrict access and identify the work area /zone while lift operations are in place. Barricades shall be at least10 feet (3 meters) from the lift equipment.

7 In case of contact to energized power lines, emergency plans and precautions are in place with all workers associated with the lift.

o Evacuation routeo Assembly area. (Select at least 33 ft or 10 meters away from the lift equipment)o Feet together shuffle walk, hopping, or heel to toe movement to evacuate.

8 In case of contact to energized power lines, lift equipment operation actions are:1. Should attempt to disengage lift equipment contact with the power

line.2. Should remain in the cab unless there is an imminent danger of fire,

explosion or other emergency.a. Evacuation routeb. Method to “jump clear”

9 Non-conductive tag lines used.

10 Review and discuss as needed this Pre Task Hazard Assessment with all crew members associated with the lift operations.


Attachment 2 - Additional Requirements where Control Clearance is less than that in Table 1 but greater than or equal to Table 2 distances.

• Operation of lift equipment (including load line, rigging and lifting accessories) within / closer than the distances given in Table 2 of un-insulated energized power lines requires the approval of the Electrical DAS and all the requirements in Attachments 1, 2, and 3 must be met.

• An insulating link/device, rated for the voltages involved and rated for the weight of loads involved must be, installed at a point between the end of the load line (or below) and the load.

Impedance Grounded Solidly Grounded Solidly Grounded*, fixed energized parts

kV Clearanceft

Clearancemeters

Clearanceft

Clearancemeters

Clearanceft

ClearanceMeters

50 or less 10.0 3.0 10.0 3.0 8.0 2.4

69 10.6 3.2 10.0 3.0 8.0 2.4

115 12.2 3.7 10.5 3.2 8.0 2.4

138 12.9 3.9 11.0 3.4 10.0 3.0

230 16.0 4.9 12.8 3.9 13.0 4.0

350 20.0 6.1 15.1 4.6 15.33 4.7

Based on US OSHA standards 29 CFR Part 1910, Subpart S


Based on NFPA 70E*or impedance grounded below 25 kV

Table 2



A dedicated spotter who is in continuous contact with the lift equipment operator is required. The dedicated spotter must:

•Be equipped with a visual aid to assist in identifying the minimum clearance distance. Examples of a visual aid include, but are not limited to: A line painted on the ground; a clearly visible line of flagged or marked stanchions; a set of clearly flagged or marked visible line-of-sight landmarks (such as a fence post behind the dedicated spotter and a building corner ahead of the dedicated spotter).

•Be positioned to effectively gauge the clearance distance.

•Where necessary, use equipment that enables the dedicated spotter to communicate directly with the operator. Examples could be by radio, horns or other alerting devices.

•Give timely information to the operator so that the required clearance distance can be maintained.



An Electrical Skilled Person, with respect to electrical power transmission and distribution, shall be present during lift operations. The Electrical Skilled Person shall:

•Be positioned with the spotter or in clear line of sight of the spotter.

•Be positioned to clearly observe the power lines and lift equipment movement.

•Be in continuous contact with the lift equipment operator

•Warn the equipment operator prior to any power line clearance distance encroachment.

•Intervene, stop lift activity, and direct boom load line and load to a safe area if lift conditions change, job scope changes or if measures to prevent power line encroachment or injury are deemed ineffective.



• Lift equipment operators remotely operating the equipment from the ground must use either wireless controls that isolate the operator from the equipment or insulating mats that insulate the operator from the ground. Insulating mats must be rated for the voltages involved.

• All lift crew, excluding the lift operator, shall wear rubber insulating gloves with leather protectors/over gloves during the lift operation.

• Insulating line hose or cover-up must be installed by the utility owner/operator except where such devices are unavailable for the line voltages involved. Installation and use of insulating barriers must be completed by Electrical Skilled Persons.



A pre job briefing or pre job hazard assessment shall be performed and lead by the lift crew leader/ lift director or supervision and the Electrical Skill Person, prior to lift equipment assembly, lift equipment disassembly and operation of the lift equipment near un-insulated power lines or parts and reviewed with all persons involved with these operations.. The pre job briefing or pre job hazard assessment shall include the listing / items given in Attachment 1 and Attachment 3 or use of Attachment 1 and Attachment 3.

Attachment 3. Additional Pre Task Hazard Assessment items for Lift Equipment Operations using Table 2Location:________________________________________Date:_____________Safe Work Permit Number/ID: ___________________Lift Director/ Lift Crew Supervision / Crew Leader___________________________Electrical Skilled Person:____________________________________________

Note: Use this check list for each activity i.e. use for assembly, use for operations, and use for disassembly. Other procedures or checklists may be used if they contain equivalent information.


Attachment 3. Additional Pre Task Hazard Assessment items for Lift Equipment Operations using Table 2

The following items are required where Table 2 distances are used. Recommend for use with Table 1 distance.

CompleteYes / No

1 Determine and record minimum clearance distance (Table 2) ________ft/m

2 An insulating link/device*, rated for the voltages involved, must be, installed at a point between the end of the load line (or below) and the load.

3 Any power line device that automatically reenergizes the circuit is disabled.

4 A dedicated spotter who is in continuous contact with the operator.


Attachment 3. Additional Pre Task Hazard Assessment items for Lift Equipment Operations using Table 2

5 An Electrical Skilled Person is positioned with the spotter who is also in continuous contact with the operator.

6 Non-conductive rigging used

7 Operating the lift equipment from the ground must use either wireless controls that isolate the operator from the equipment or insulating mats that insulate the operator from the ground. Insulating mats must be rated for the voltages involved.

8 Lift equipment has been grounded with a PPG (See EWP-33)

9 Insulating line hose or insulating covers are installed.


Simplified Flow Diagrams

iGrafx Document

LIFT EQUIPMENT IN TRANSIT

ASSEMBLY AND DISASSEMBLY OF LIFT EQUIPMENT

LIFT OPERATIONS

iGrafx Document

iGrafx Document


Voltage (nominal, kV, alternating current)

Minimum clearance distance to uninsulated energized conductors


up to 50 10 3.05

over 50 to 200 15 4.57

over 200 to 350 20 6.10


Impedance Grounded Solidly Grounded Solidly Grounded*, fixed energized parts

kV Clearanceft

Clearancemeters

Clearanceft

Clearancemeters

Clearanceft

ClearanceMeters

50 or less 10.0 3.0 10.0 3.0 8.0 2.4

69 10.6 3.2 10.0 3.0 8.0 2.4

115 12.2 3.7 10.5 3.2 8.0 2.4

138 12.9 3.9 11.0 3.4 10.0 3.0

230 16.0 4.9 12.8 3.9 13.0 4.0

350 20.0 6.1 15.1 4.6 15.33 4.7



Based on NFPA 70E*or impedance grounded below 25 kV

Table 2. Control Clearance for EWP-13 – Lift work with the safety observation of an Electrical Skilled Person


Summary

• Remember 20 ft (6.1 meters) - FOR– The distance (under, over, sides) for lift

equipment assembly, disassembly and lift operations where this standard applies ( for less than 350 kV) i.e. the trigger to review and use as needed EWP-13.

– When a spotter is required for lift equipment in transit.

• Natural or existing barriers or stanchions must be marked

• Demarcate your work zone


Summary –con’t• All power lines are presumed to be energized. • All power lines are presumed to be un-

insulated.• Lift equipment includes any vehicle or

mechanical equipment capable of having parts of its structure elevated

• Voltages of the power lines must be known.• Know your actions in case of contact with

power lines.• Understand step and touch potential and how

to avoid this electric shock and electrocution hazard.

• Use non-conductive tag lines.

Date post:	27-Dec-2015
Category:	Documents
Upload:	owen-fitzgerald
View:	228 times
Download:	0 times

DOW RESTRICTED - For internal use only EWP-13 Elevated Equipment Near Power Lines (US Requirements)...

Documents