ECS 03-0054 Connection of Large LV Services to secondary...

Document Number: ECS 03-0054

Version: 3.0

Date: 20/02/2018

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ENGINEERING CONSTRUCTION STANDARD

ECS 03-0054

CONNECTION OF LARGE LV SERVICES TO SECONDARY DISTRIBUTION SUBSTATIONS

Network(s): EPN, LPN, SPN

Summary: This standard details the procedures to be undertaken when connecting large LV Services to UK Power Network's secondary distribution substations

Author: Jesse Garcia Date: 20/02/2018

Approver: Paul Williams Date: 20/03/2018

This document forms part of the Company’s Integrated Business System and its requirements are mandatory throughout UK Power Networks. Departure from these requirements may only be taken with the written approval of the Director of Asset Management. If you have any queries about this document please contact the author or owner of the current issue.

Applicable To

UK Power Networks External

☒ Asset Management ☒ G81 Website

☐ Capital Programme ☒ UK Power Networks Services

☒ Connections ☐ Contractors

☐ Health & Safety ☒ ICPs/IDNOs

☐ Legal ☐ Meter Operators

☒ Network Operations

☒ Procurement

☐ Strategy & Regulation

☐ Technical Training

Connection of Large LV Services to secondary distribution substations


Version: 3.0

Date: 20/02/2018

© UK Power Networks 2018 All rights reserved 2 of 23

Revision Record

Version 3.0 Review Date 08/06/2022

Date 13/02/2018 Author Jesse Garcia

Reason for update: Updated to include new 2500Amp ACB.

What has changed: Inclusion of 2500Amp ACB, in section 4.



Reason for update: Minor version update

What has changed: references to EDS 08-0143 changed to EDS 08-2100



Reason for update: Periodic review;

What has changed: Two revised pictures under equipment particulars; one for ML7 termination and tool used for terminating.



Original Version



Version: 3.0

Date: 20/02/2018


Contents

1 Introduction ............................................................................................................. 4

2 Scope ....................................................................................................................... 4

3 Glossary and Abbreviations ................................................................................... 4

4 Equipment Particulars ............................................................................................ 5

4.1 Cables and Terminations ........................................................................................... 7

4.2 Metering .................................................................................................................... 9

4.2.1 ACB Protection Settings and Commissioning ............................................................ 9

4.3 Outdoor Transformer-mounted Cabinet with one or two 800A Service Ways........... 10

4.3.1 Equipment ............................................................................................................... 10

4.3.2 Cables and Terminations ......................................................................................... 11

4.3.3 Metering .................................................................................................................. 12

4.4 Indoor Wall-mounted 800A Service Way on a M1 or M2 LV Board .......................... 14

4.4.1 Equipment ............................................................................................................... 14

4.4.2 Cables and Terminations ......................................................................................... 15

4.4.3 Metering .................................................................................................................. 16

5 Testing, Commissioning and Energisation ......................................................... 18

5.1 Testing .................................................................................................................... 18

5.2 Commissioning ........................................................................................................ 18

5.3 Energisation ............................................................................................................ 18

6 References ............................................................................................................. 19

6.1 UK Power Networks Standards ............................................................................... 19

6.2 National and International Standards ....................................................................... 19

Appendix A – Metering Wiring Diagrams ........................................................................ 20

A.1 Substation Wiring Diagram for Connection of a Single LV Service .......................... 20

A.2 Substation Wiring Diagram for Connection of Two LV Services ............................... 21

A.3 Metering Termination Cabinet Wiring Diagram ........................................................ 22

A.4 Meter Termination Chamber .................................................................................... 23



Version: 3.0

Date: 20/02/2018


1 Introduction

This standard details the procedures to be undertaken when customers LV cables are to be connected to UK Power Network's LV equipment within a substation.

2 Scope

This standard covers the connection of large LV services, using LV cables provided by the customer to the following types of UK Power Networks LV distribution substation equipment:

Indoor/Outdoor transformer-mounted cabinet, containing a 1600A (NW16 H2) ACB and a spare service way (for use in all three UK Power Networks regions).

Indoor/Outdoor transformer-mounted cabinet, containing a NW25 H1 2500Amp for 1.5MVA transformer connections.

NW20 H1 2000Amp wall mounted ACB.

Outdoor transformer-mounted cabinet, containing one or two 800A service ways.

Indoor top or bottom entry wall-mounted 800A service way mounted on a M1 or M2 LV board.

3 Glossary and Abbreviations

Term Definition

ACB Air Circuit Breaker

AWS Aluminiun Wire Stranded Cable

COP 2,3,5 Metering Codes Of Practice

CT Current Transformer.

UK Power Networks UK Power Networks (Operations) Ltd consists of three electricity distribution networks:

Eastern Power Networks plc (EPN).

London Power Network plc (LPN).

South Eastern Power Networks plc (SPN).



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4 Equipment Particulars

Outdoor Transformer-mounted Cabinet with a 1600A (NW16 H2) ACB

This transformer-mounted cabinet (UK Power Networks Stores Code 13989Q) is used to provide a direct connection for a customer to a UK Power Networks substation for a load of between 415 and 1000kVA and includes an additional single 630A service way for network distribution.

The cabinet are designed to accept up to eight single-core armoured or unarmoured LV cables using UK Power Networks LV mechanical connector kits and a copper green and yellow earth cable. The cables shall be supplied by the customer and connected to the cabinet by UK Power Networks staff or contractors using the UK Power Networks approved jointing kits.

Indoor/Outdoor transformer-mounted cabinet, containing a NW25 H1 2500Amp for 1.5MVA transformer connections.

This transformer-mounted cabinet (UK Power Networks Stores Code 14000T) is used to provide a direct connection for a customer to a UK Power Networks substation for a load of up to 1500kVA.This ACB is best terminated with UT9 terminations as ML7s will be too difficult to terminate in the space available. Start cabling from the back towards the front.

Note: Use UT-9I Termination only, three per phase.

LV transformer termination kit (Sicame UT-9I) UK Power Networks Stores Code 04522S for single-core cables these connectors should be used with the following sizes of cable:

300mm2, 400mm2 to 600mm2 stranded copper cable depending on the cable route.



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2000Amp Wall Mounted ACB (NW20 H1)

This 2000Amp wall mounted ACB (UK Power Networks Stores Code 14223F) is used to provide a direct connection for a customer to a UK Power Networks substation for a load of between 415 and 1000kVA.

Note: Customer CTs are wired for top cable entry, if customer cables are connected at the bottom CT wiring must be modified by a meter operator or competent person.

The cabinet is designed to accept up to six single-core armoured or unarmoured LV cables using UK Power Networks LV mechanical connector kits and a copper green and yellow earth cable. The cables shall be supplied by the customer and connected to the cabinet by UK Power Networks staff or contractors using the UK Power Networks approved jointing kits.

The ACB comes supplied with a neutral termination plate to be attached to the transformer. Five meters of neutral cable protected via flexible conduit is provided for the connection of the metering neutral and to be attached to the same plate as the main neutral.

Metering Terminal Block

Each cabinet comes with pre-installed 1600/5A metering current transformers and voltage connections, which are pre-wired to a separate metering terminal box on the side of the outside of the cabinet.

Note: Leave yellow shorting links in place if metering CTs are not utilised.



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4.1 Cables and Terminations

Cable Termination Details:

ML7 Termination:

UK Power Networks commodity code: 02217B

ML7 Termination

The Sicame ML7 can be utilised for terminating.

630mm2 stranded copper

740mm2 solid aluminium

Picture of ML7 attached to ACB cabinet.

Termination Tool

This lug requires an insulated ratchet tool (UK Power Networks Stores Code 31547B / Sicame Part No JTS/7I) to shear off the conductor bolts.

UT-9I Termination

LV transformer termination kit (Sicame UT-9I) UK Power Networks Stores Code 04522S for single-core cables these connectors should be used with the following sizes of cable:

300mm2, 400mm2 and 500mm2 stranded copper;

400mm2 and 500mm2 stranded aluminium;

480mm2 and 600mm2 solid aluminium.



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UT-9I Termination

The above UT connectors shall be installed as specified in Section 4.6 of the UK Power Networks LV Jointing Manual.

If the customer installs aluminium wire armoured single core cables, the armour shall be connected to earth at the customer’s switchgear, where the incoming point of isolation is located.

Within the Transformer mounted cabinet, the aluminium armours shall be cut off level with outer sheath cut and insulated with heatshrink tube supplied with the termination kit, 25mm above the wooden cleat block.

Wall Mounted ACB Neutral Termination

The wall mounted ACB is supplied with a neutral termination plate, (depicted on the left) for the connection of up two UT9/Is or two ML7s. The plate also has a neutral lug for the purpose of connecting the metering neutral.

Terminating SWA with glands in cabinets and cabinet mounted ACBs

UKPN Stores Code: - 48806M

Brass glands will need to be supplied by the customer to suit customers cable

Note: Earth strands should be connected on customer’s side only. Plate is not suitable for wall mounted equipment.



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Date: 20/02/2018


4.2 Metering

In addition, there is the provision for the connection of either a 12 or 19 core 2.5mm2 copper

multi-core cables:

For a maximum cable length of 20 metres use 12 core 2.5mm2 copper multi-core cable (UK Power Networks Stores Codes 05973F).

For a length of between 20 and 40 metres use 19 core 2.5mm2 copper multi-core cable (UK Power Networks Stores Codes 05974Q).

These cables are used to make a connection between the enclosure on the right hand side of the cabinet and an LV COP 5 metering termination cubicle (UK Power Networks Stores Code 01329H) that is installed remotely in the customer’s switch room. This particular cable is installed and connected by UK Power Networks.

The 12 or 19 core cables shall be connected to the connection box and metering termination cubicle via a brass BW25 termination gland (UK Power Networks Stores Code 03803N).

The wiring diagrams for both ends of this cable connection are provided in Appendix A.

4.2.1 ACB Protection Settings and Commissioning

The ACB shall be commissioned in accordance with ECP 11-0514 using the protection settings from EDS 05-2011.



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Date: 20/02/2018


4.3 Outdoor Transformer-mounted Cabinet with one or two 800A Service Ways

4.3.1 Equipment

This transformer-mounted cabinet is used to provide a direct connection for one or two customers to a UK Power Networks substation each capable of supplying a load of between 275 and 550kVA.

Each cabinet comes with pre-installed 800/5A metering current transformers and voltage connections, which are pre-wired to a separate metering terminal box on the left hand side of the cabinet. Two versions are available:

One Service Way (UK Power Networks Stores Code 13987V) (Schneider Part No. EEE20R4).

Two Service Way (UK Power Networks Stores Code 13988F) (Schneider Part No. EEE21R4).



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4.3.2 Cables and Terminations

This cabinet is designed to accept either one or two sets of four single-core armoured or unarmoured LV cables for each service using UK Power Networks LV mechanical connector kits and a copper green and yellow earth cable. The cables shall be supplied by the customer and connected to the cabinet by UK Power Networks staff or contractors using the following approved jointing kit:

LV Transformer Termination kit (Sicame UT-9I) UK Power Networks Stores Code 04522S for single core cables these connectors should be used with the following sizes of cable:

300mm2, 400mm2 and 500mm2 stranded copper.

400mm2 and 500mm2 stranded aluminium.




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Date: 20/02/2018





4.3.3 Metering

In addition, there is the provision for the connection of either a single 12 or 19 core 2.5mm2

copper multi-core cables:

For a maximum cable length of 20 metres use 12 core 2.5mm2 copper multi-core cable (UK Power Networks Stores Codes 05973F).


These cables are used to make a connection between the enclosure on the right hand side of the cabinet and an LV COP 5 metering termination cubicle (UK Power Networks Stores Code 01329H) that is installed remotely in the customer’s switch room. This particular cable is installed and connected by UK Power Networks.



Version: 3.0

Date: 20/02/2018



The wiring diagrams for both ends of this cable connection are provided in Appendix A



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Date: 20/02/2018


4.4 Indoor Wall-mounted 800A Service Way on a M1 or M2 LV Board

4.4.1 Equipment

These 800A service ways are designed to be installed on to a new Schneider Electric M1 or M2 LV board and are used to provide a direct connection for an individual customer to a UK Power Networks substation.

Each 800A service way occupies the same amount of space as two standard 400A service ways and comes with pre-installed 800/5A metering current transformers and voltage connections, which are pre-wired to a separate wall-mounted metering terminal plate. Two versions available:

Top Entry 800A Service Way (UK Power Networks Stores Code 13996U) (Schneider Part No. EXK211).

Bottom Entry 800A Service Way (UK Power Networks Stores Code 13987V) (Schneider Part No. EXK210).



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Date: 20/02/2018


4.4.2 Cables and Terminations

Each service way is designed to accept either one or two sets of four single-core armoured or unarmoured LV cables using UK Power Networks LV mechanical connector kits and a copper green and yellow earth cable. The cables shall be supplied by the customer and connected to the fuse way by UK Power Networks staff or contractors using the following approved jointing kits:

LV Transformer Termination kit (Sicame UT-9I) UK Power Networks Stores Code 04522S for single core cables these connectors should be used with the following sizes of cable:

300mm2, 400mm2 and 500mm2 stranded copper.

400mm2 and 500mm2 stranded aluminium.




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Date: 20/02/2018





4.4.3 Metering

The wall mounted metering terminal plate has the provision for the connection of either a single 12 or 19 core 2.5mm2 copper multi-core cables:

For a maximum cable length of 20 metres use 12 core 2.5mm2 copper multi-core cable (UK Power Networks Stores Codes 05973F);


These cables are used to make a connection to an LV COP 5 metering termination cubicle (UK Power Networks Stores Code 01329H) that is installed remotely in the customer’s switch room. This particular cable is installed and connected by UK Power Networks.



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Date: 20/02/2018



The wiring diagrams for both ends of this cable connection are provided in Appendix A.



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Date: 20/02/2018


5 Testing, Commissioning and Energisation

To ensure that all installations of this type are installed, tested and commissioned safely it is important that close liaison is made between the customer’s authorised person on site and the UK Power Networks authorised person or contractor on site.

5.1 Testing

Prior to the commissioning and energisation of any of the types of service covered by this standard the customer’s cables shall be tested in accordance with ECP 11-0008 ‘LV Cable Testing’. The test should be either carried out directly by UK Power Networks Operational staff/contractors or be carried out by the customer’s authorised person on site and witnessed by UK Power Networks or its nominated contractor.

5.2 Commissioning

Prior to energisation of any of the types of service covered by this standard the customer’s cables shall be checked to ensure that they are in a safe condition and disconnected from the customer’s installation. For this purpose, it is recommended that the process and procedure documented in UK Power Networks Distribution Safety Rules for ‘Work on Customers HV Systems’ is utilised and a HV Operational Isolation and Earthing (OIE) is used by both parties to clearly identify the customer’s equipment, how it has been isolated and made safe.

Metering terminals are IP2X protected and therefore there is no danger of electrification via hands/fingers. Operatives who are commissioning metering wires must treat the terminals as “Live” and check with an approved testing device prior to inserting small wiring, Operatives and meter operators must use fuse links and shorting CT links to ensure “Isolation” of the small wiring is achieved during connection and also thereafter when working on the equipment. Appropriate PPE should be worn at all times.

5.3 Energisation

HSS 40 052 Energisation and Disconnection of Electrical Apparatus and Plant including all cables shall be used to notify the relevant parties of the energisation of all apparatus covered by this standard. The issue of this document helps to discharge part of UK Power Networks obligations under the CDM regulations. The document allows for individual items of apparatus to be identified as being energised as well as numerous items on the same site.

Before energising any cable or item of equipment on third-party land or a construction site for the first time:

HSS 40 052 shall be issued to the customer, landowner or site manager responsible for works on the site.

The carbon copy of the certificate shall be returned and archived with the job file.

The customer’s, landowner's or site manager’s signature shall be obtained, wherever possible, to acknowledge receipt of the document.

A copy of the construction and/or route plan identifying the apparatus that is being energised shall be attached to the certificate.

A separate ‘Notification of Energised Apparatus Electricity Certificate’ shall be issued for each individual service being energised. The service cable size, earth fault loop impedance and cut-out fuse size shall be recorded on the bottom of the certificate.



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Date: 20/02/2018


6 References

6.1 UK Power Networks Standards

The provisions within this standard are based on requirements detailed in EDS 08-2100

CDM Regulations

EAS 13-0052 LV Equipment for Large LV Services

ECP 11-0008 LV Cable Testing Procedure

ECP 11-0514 ACB Commissioning Procedure

EDS 05-2011 Air Circuit Breaker Protection Settings

EDS 08-2100 LV Customer Supplies

HSS 40 052 Energisation and Disconnection of Electrical Apparatus and Plant including All Cables

UK Power Networks Distribution Safety Rules 2016

UK Power Networks LV Jointing Manual

6.2 National and International Standards

BS EN 60947-2

ENA TS 37-02 Public Electricity Network Distribution Assemblies



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Appendix A – Metering Wiring Diagrams

A.1 Substation Wiring Diagram for Connection of a Single LV Service



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Date: 20/02/2018


A.2 Substation Wiring Diagram for Connection of Two LV Services



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A.3 Metering Termination Cabinet Wiring Diagram



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A.4 Meter Termination Chamber

1 Introduction2 Scope3 Glossary and Abbreviations4 Equipment Particulars4.1 Cables and Terminations4.2 Metering4.2.1 ACB Protection Settings and Commissioning

4.3 Outdoor Transformer-mounted Cabinet with one or two 800A Service Ways4.3.1 Equipment4.3.2 Cables and Terminations4.3.3 Metering

4.4 Indoor Wall-mounted 800A Service Way on a M1 or M2 LV Board4.4.1 Equipment4.4.2 Cables and Terminations4.4.3 Metering

5 Testing, Commissioning and Energisation5.1 Testing5.2 Commissioning5.3 Energisation

6 References6.1 UK Power Networks Standards6.2 National and International StandardsAppendix A – Metering Wiring DiagramsA.1 Substation Wiring Diagram for Connection of a Single LV ServiceA.2 Substation Wiring Diagram for Connection of Two LV ServicesA.3 Metering Termination Cabinet Wiring DiagramA.4 Meter Termination Chamber

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