Document Number: EOP 03-0072
Date: 10/03/2015
ENGINEERING OPERATING PROCEDURE
EOP 03-0072
PUP BUSBAR FOR WT HENLEY CUT-OUTS
Network(s):
EPN, LPN, SPN
Summary:
This operating procedure details the installation instructions and limitations of use
for the WT Henley Pup busbar.
Owner:
Jesse Garcia
Date:
10/03/2015
Approved By:
Steve Mockford
Approved Date:
31/03/2018
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
All UK Power Networks
G81 Website
Asset Management
Contractors
Capital Programme
ICPs/IDNOs
Connections
Meter Operators
HSS&TT
Network Operations
UK Power Networks Services
Other
THIS IS AN UNCONTROLLED DOCUMENT, THE READER MUST CONFIRM ITS VALIDITY BEFORE USE
Version: 4.1
Pup Busbar for WT Henley Cut-Outs
Document Number: EOP 03-0072
Version: 4.1
Date: 10/03/2015
Revision Record
Version
4.1
Review Date
31/03/2018
Date
13/03/2015
Author
Lee Strachan
Why has the document been updated – Minor update
What has changed – Document number corrected
Version
4.0
Review Date
31/03/2018
Date
10/03/2015
Author
Jesse Garcia
Why has the document been updated – Periodic review
What has changed – Document re-numbered from EBP 03-0034 to EOP 03-0072
Version
3.1
Review Date
22/03/2015
Date
28/07/2012
Author
Lee Strachan
Document reviewed for publishing on G81 website
Version
3.0
Review Date
Date
19/01/2012
Author
J Garcia
Reviewed for Series-8
Version
2.0
Review Date
Date
02/03/2011
Author
J Garcia
Reviewed and Rebranded
Version
1.0
Review Date
Date
22/08/2005
Author
D J Collis
Original (Review date extended by DJC)
© UK Power Networks 2015 All rights reserved
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Pup Busbar for WT Henley Cut-Outs
Document Number: EOP 03-0072
Version: 4.1
Date: 10/03/2015
Contents
1
Introduction ............................................................................................................. 4
2
Scope ....................................................................................................................... 4
3
Description............................................................................................................... 5
3.1
Existing Services ....................................................................................................... 5
3.2
New Services ............................................................................................................ 5
4
Actions Required ..................................................................................................... 5
4.1
Existing Services ....................................................................................................... 5
4.2
New Services ............................................................................................................ 5
5
Installation Instructions .......................................................................................... 5
© UK Power Networks 2015 All rights reserved
3 of 9
Pup Busbar for WT Henley Cut-Outs
Document Number: EOP 03-0072
Version: 4.1
Date: 10/03/2015
1
Introduction
The WT Henley Pup busbar has been used on the UKPN network for some years. The
busbar is currently only suitable for use on WT Henley, Series 7, 8.
The Pup busbar from WT Henley has previously been used to supply a second service from
an existing 100A supply with the two fuses fed from the service restricted to 60A. This
practice will not be allowed for new services. In future, for new services, the fuse rating of
the second fuse will be restricted to 30A and the main fuse to 60A (see drawing below).
Landlords
Supply
Pup fuse
30A
30A
Landlords
Supply
Service
Pup fuse
30A
30A
Main Fuse
60A
60A
A
A
Neutral
Pup
bar
PupBus
Busbar
Cable
cover
Service
Service
Main Fuse Main Fuse
60A
60A
60A
100A
Service
Main Fuse
60A
100A
A
A
Neutral
Pup
bar
PupBus
Busbar
Cable
cover
Incoming
Cable
In
coming
Cable
Incoming Cable
Cable
In coming
The original pup busbar was designed with only a single screw termination and service
failures have occurred on existing services. The new design of busbar provides full contact
with both screws in the terminal. The new design is shown Section 5 and should be used to
replace any existing Pup busbars found on the UK Power Network.
2
Scope
This bulletin applies to all three networks within UK Power Networks and should be applied
to all new and existing services supplied using the WT Henley Pup busbar.
© UK Power Networks 2015 All rights reserved
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Pup Busbar for WT Henley Cut-Outs
Document Number: EOP 03-0072
Version: 4.1
Date: 10/03/2015
3
Description
3.1
Existing Services
Where existing services are discovered with the old style of Pup busbar they should be
replaced with the new style. When changing the Pup, a check must be made to ensure that
the main fuse in the existing service is reduced to a maximum of 60A. If a higher rated fuse
is discovered, then it must be replaced with a 60A fuse. If this is not done the cut-out could
be subjected to an overload and may fail. The principle of reducing both fuses to 60A must
also be applied to all existing looped services using cables. Looped services must not be
fused above 60A.
3.2
New Services
When used for a new service, the maximum size of fuse in the service supplied by the Pup
will be 30A. A 30A wide bodied fuse to fit the standard 100A WT Henley fuse carriers will be
supplied with each Pup busbar.
4
Actions Required
4.1
Existing Services
Replace older style Pup busbars with the new style and ensure that the main service is
down-rated to a maximum of 60A and the pup is fused at 30A. The fuse carriers must be
appropriately labelled.
4.2
New Services
The WT Henley Pup busbar is only permitted for use on new services up to 30A and the
main fuse may only be rated up to 60A
5
Installation Instructions
To install a WT Henley Pup busbar onto an existing or new service, follow the instructions
below:
1. The old style Pup busbar.
Note: The original Pup busbar was
designed with only a single screw
termination and service failures have
occurred on existing services.
© UK Power Networks 2015 All rights reserved
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Pup Busbar for WT Henley Cut-Outs
Document Number: EOP 03-0072
Version: 4.1
Date: 10/03/2015
2. New WT Henley Pup busbar kit.
UKPN Commodity Code 12027V
includes 30A fuse link and label.
3. Add 60A label.
UKPN Commodity Code 12028F.
4. On arrival check the condition of
cut-out and fuse ratings.
Remove fuse carrier and neutral cover
from the SP&N cut-out. This will allow
the removal of the cable cover.
© UK Power Networks 2015 All rights reserved
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Pup Busbar for WT Henley Cut-Outs
Document Number: EOP 03-0072
Version: 4.1
Date: 10/03/2015
5. Remove the plastic plug.
By pushing inwards towards were the
plug is located with a screwdriver the
plug should fall out; alternatively you
may use a pair of pliers to pull the plug
out.
6. Undo terminal screws.
Undo the terminals on the bottom left
hand of the single pole and neutral cutout and also the single-phase unit. The
busbar will only fit in these terminals
and if it is being used on an existing
service the incoming service cable may
need to be moved to the right hand
side terminal.
7. Insert Pup fuse on the left hand
terminal.
Ensure pup is fully inserted into the
carrier.
8. Install the second fuse way and
secure to the meter board.
Ensure the Pup is fully inserted into
both carriers so that no gaps are left or
exposed to foreign object ingress.
Note: That the cable termination on
second fuse way is blocked. Secure
carrier to the back board.
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Pup Busbar for WT Henley Cut-Outs
Document Number: EOP 03-0072
Version: 4.1
Date: 10/03/2015
9. Check tightness.
Tighten the terminal screws on the two
fuse ways, and check the tightness of
all existing terminals.
10. Ensure correct fusing and labels
are utilised.
Install a 30A fuse in the additional fuse
carrier and down-rate the main fuse to
a maximum of 60A.
11. Preparing the cable chamber.
Using a pair of pliers remove
chamber’s pup access from the side
cover.
© UK Power Networks 2015 All rights reserved
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Pup Busbar for WT Henley Cut-Outs
Document Number: EOP 03-0072
Version: 4.1
Date: 10/03/2015
12. Install cable covers.
Complete visual checks and replace
cable cover and neutral cover and
install fuse carriers into fuse ways.
© UK Power Networks 2015 All rights reserved
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