engineering construction...

Document Number: ECS 13-0080

Version: 2.0

Date: 26/09/2017

TH

IS IS

AN

UN

CO

NT

RO

LL

ED

DO

CU

ME

NT

, T

HE

RE

AD

ER

MU

ST

CO

NF

IRM

IT

S V

AL

IDIT

Y B

EF

OR

E U

SE

ENGINEERING CONSTRUCTION STANDARD

ECS 13-0080

COMBINED CUT-OUT AND CT CHAMBER INSTALLATION

Network(s): EPN, LPN, SPN

Summary: This standard details the procedure for installing the Schneider combined cut-out and CT chamber.

Author: Jesse Garcia Date: 26/09/2017

Approver: Paul Williams Date: 05/10/2017

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

Combined Cut-Out and CT Chamber Installation Document Number: ECS 13-0080

Version: 2.0

Date: 26/09/2017

© UK Power Networks 2017 All rights reserved 2 of 14

Revision Record

Version 2.0 Review Date 05/10/2022

Date 26/09/17 Author Jesse Garcia

Reasons for Update: Periodic Review

What has changed:

Section 6.1; Added M6 washer in order to fix it onto plywood.

Schneider drawing number updated in section 7.2

Version 1.0 Review Date 14/10/2017

Date 27/09/2016 Author Jesse Garcia

New document to cover the installation of the combined cut-out and CT chamber


Version: 2.0

Date: 26/09/2017


Contents

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

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

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

4 Equipment Description ........................................................................................... 5

4.1 Three Phase Cut-Out ................................................................................................ 5

5 Parts List .................................................................................................................. 6

6 Cut-out and CT Chamber Installation ..................................................................... 7

6.1 Overview ................................................................................................................... 7

6.2 Mounting Cable Box (Item 2) ..................................................................................... 9

6.3 Incoming Cable ....................................................................................................... 10

6.4 Covers ..................................................................................................................... 11

6.5 Outgoing Cables ...................................................................................................... 12

6.6 Meter Terminal Box ................................................................................................. 12

6.7 Replacing CTs and Terminations ............................................................................. 13

7 References ............................................................................................................. 14

7.1 UK Power Networks’ Standards............................................................................... 14

7.2 Other Documents .................................................................................................... 14

Figures

Figure 4-1 – Combined Cut-out and CT Chamber ................................................................. 5

Figure 4-2 – Secure Premier Meter ....................................................................................... 6

Figure 4-3 – Elster A1700 Meter ........................................................................................... 6

Figure 4-4 – Elster A1120/40 Meter ...................................................................................... 6

Figure 4-5 – EDMI MK10E Meter .......................................................................................... 6

Tables

Table 5-1 – Parts List ............................................................................................................ 6


Version: 2.0

Date: 26/09/2017


1 Introduction

This standard details the procedures to be undertaken when installing the Schneider combined cut-out CT chamber.

2 Scope

This standard applies to the installation of the Schneider combined cut-out and CT chamber in EPN, LPN and SPN.

3 Glossary and Abbreviations

Term Definition

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).


Version: 2.0

Date: 26/09/2017


4 Equipment Description

The Schneider combined cut-out and CT chamber is shown in Figure 4-1 consists of a 400A three-phase cut-out, a CT chamber containing three 400/5 CTs and a meter terminal box that can accept a range of meters shown in Figure 4-2 to Figure 4-5.

4.1 Three Phase Cut-Out

Figure 4-1 – Combined Cut-out and CT Chamber


Version: 2.0

Date: 26/09/2017


Figure 4-2 – Secure Premier Meter Figure 4-3 – Elster A1700 Meter

Figure 4-4 – Elster A1120/40 Meter Figure 4-5 – EDMI MK10E Meter

5 Parts List

The parts list required to install the combined cut-out and CT chamber is shown below.

Table 5-1 – Parts List

Part Materials Code Qty Comments

Combined Schneider CT-chamber 47441N 1

M10 Fixings 13698R 3

M6 Washers 13247H 3


Version: 2.0

Date: 26/09/2017


6 Cut-out and CT Chamber Installation

6.1 Overview

Refer to the LV Manual for jointing instructions.

Equipment Assembly

The combined cut-out and CT chamber is supplied as two parts:

Item 1 – Main cut-out body including cable terminals and meter box (weight 15kg).

Item 2 – Front cover, fuse handles, bottom terminal covers, 3 x blanking discs, incoming cable grommet and cable box.


Version: 2.0

Date: 26/09/2017


Mounting Main Cut-out Body (Item 1) Fixing Item 1 on Wall

Use the template provided to mark out the two main fixing holes for the cut-out body.

Fixing Item 1 on Wall

Remove the cable terminal covers as shown using a flat head screwdriver.

Following manual handling guidelines mount the main cut-out body to the wall using suitable fixings as appropriate for the site conditions (not supplied with kit).


Drill wall and fix to the wall using M10 fixings when fixing to brick walls.

Utilise an M6 washers and suitable wood screws when fixing to plywood the length of the screw will be dependent on thickness of the plywood on site.


Version: 2.0

Date: 26/09/2017



The copper earth component behind the nominated hole to the right hand side has been modified to allow an M10 fixing to pass through.

6.2 Mounting Cable Box (Item 2)

Fixing Item 2

Once item 1 is secured to the wall, line up the cable box (item 2) and mark the three fixing holes.

Drill holes.

Mount the cable box on the wall using the three holes drilled previously using suitable fixings.


Version: 2.0

Date: 26/09/2017


6.3 Incoming Cable

Cable Range

1x (70mm² – 300mm²) solid aluminium sectorial conductors or

1x (70mm² – 300mm²) stranded conductors.

Cable Terminations

1 x termination per phase using Sicame UMT300 (shear head connector).

Cable Installation

Install the cables in accordance with the LV jointing manual.


Version: 2.0

Date: 26/09/2017


6.4 Covers

Fitting Covers

Replace the terminal covers using the two screws on either side of the cover.

Replace the front cover and the cable box front cover as shown.

Ensure the wire seals are present in the locations shown in the image on the left.

Cable Cover Securing

In order to secure the front part of the cable chamber, ensure that all the captive back clips are attached to the back of the cable chamber.


Version: 2.0

Date: 26/09/2017


6.5 Outgoing Cables

Internal Cable Grommet

With a hacksaw, cut the grommet to suit the correct cable size in order to avoid ingress of foreign objects.

Note: Ensure the grommets protrude through the trunking if using trunking, to avoid IP rating issues.

Cable Range

1x (70mm² – 300mm²) solid aluminium sectorial conductors.

Or 1x (70mm² – 300mm²) stranded conductors.

Terminations

1 or 2 terminations per phase using Sicame UMT300 (shear head connector).

6.6 Meter Terminal Box

Meter Terminal box

Electrical diagram ref, with WAGO terminal (DJ207E001).


Version: 2.0

Date: 26/09/2017


6.7 Replacing CTs and Terminations

Replacing CTs and Terminations

In order to replace the CT or the termination the stalk needs to be undone.

Before the stalk is removed the plastic white pin holding the CT depicted on the picture needs to be removed so that the stalk can be pulled away.

M12 nut securing stalks depicted on the left picture; recommended tightening torque 40Nm.

Replacing CTs and Terminations

Once the stalk has been removed.

The termination can be pulled upwards through the CT.

The CT is held onto the bus bar via a pin; it will require removing.

Note: The CT wiring S1; S2, and CT ration must be correct if the CTs are replaced.

The CT wiring must be kept away from the termination and protected by the polycarbonate barriers provided.

Sicame Terminations

The UMT95 has 2 x M6 fixings and the recommended tightening torque 20Nm.




Version: 2.0

Date: 26/09/2017


7 References

7.1 UK Power Networks’ Standards

EAS 13-0081 Combined Cut-Out and CT-Chamber

LV Jointing Manual

7.2 Other Documents

Schneider Cut-Out Drawing

EUKPNCTC-SF