[TCUG] Re: 6 year electrical testing
- From: "Welsh, Paul" <Paul.Welsh@xxxxxxxxxxxxxxxxxx>
- To: "'tcug@xxxxxxxxxxxxx'" <tcug@xxxxxxxxxxxxx>
- Date: Tue, 15 Jun 2004 14:14:12 +0100
Answer, there is no need to disconnect in this way.
You can use power from a live feed at each remote point or adopt the
Birmingham method, where a spare core is powered up temporarily by inserting
a fuse to provide power for the test - the advantage is that lamp circuits
don't experience the earth impedance test load.
Just remember to test ALL remote points. That means on a three head signal
pedestal, with push button, test each transformer mounting plate, the push
button door and the pedestal. There is a tendency to just test the
pedestal, that isn't good enough.
PW
-----Original Message-----
From: Chris Gladwyn [mailto:chris.gladwyn@xxxxxxxxxxxxxxxxxx]
Sent: 15 June 2004 13:34
To: tcug@xxxxxxxxxxxxx
Subject: [TCUG] 6 year electrical testing
I am currently looking at TCUG guidance Note 1 which in section 2.4.7
suggests that core to core testing may be omitted as there is a
possibility of :-
1. Reduced safety for highway users whilst installation inoperative for
lengthy periods (perhaps up to 3 days at complex sites).
2. Insecure reconnection of cables especially on older installations.
3. Incorrect retermination of cables at either street equipment or
controller.
4. Additional traffic congestion while temporary arrangements in
operation.
5. Loss of special facilities (pedestrians, cycles, bus priority) for
long periods
Whilst I agree with this the document then recommends that the
continuity of the steel wire armour be tested. The test procedure for
this is to disconnect every core at the pole cap and then connect all
cores together and connect to the SWA.
Surely some of the arguments for core to core testing apply to this as
well.
Does anyone have advice on this and is there an alternative test that
could be carried out that would meet the requirements of BS7671 without
having to disconnect all connections in the pole cap.
Chris Gladwyn
Hertfordshire Highways
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