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Posted By Topic: Connection after an ESC

Jul 11 2018 18:16

Hi there, As I read the regulation With regards to Electrical Safety Certificates Regulation 74A. (2)
When an installation is disconnected by a local supply authority faultman to allow the electrical worker to carry out the electrical repair such as a point of entry replacement,
Then the LSA cannot reconnect as a ESC cannot be supplied as the work is not \"complete\" until the power is reconnected.
This would then mean that the Electrical worker would need to be on site when the LSA faultman reconnects the supply in order to carry out tests and write up the ESC.
I think I am reading the regulation correctly and if so means that when an ESC is supplied before the power is re instated would in fact be illegal or to that effect.
Another effect would be that the electrical worker could be waiting hours for the faultman to turn up to reconnect the supply to allow testing !
others views would be appreciated


Jul 12 2018 07:55

Just to clarify - are you talking re connect or reliven? There is a big difference.

If only the fuse element has been removed it is simply a reliven. This is not controlled by regulation and the final connection would be done by the electrical worker. The electrical worker completes the tests / checks IAW ESR 73A and completes the ESC IAW ESR 74A.

If it is a reconnection (wires being reterminated at the point of connection), the liney would need to complete the checks and tests IAW ESR 73A and complete an ESC IAW ESR 74A. They may need to sight a CoC / RoI from you however to complete those checks.

I hope this helps.

Jul 12 2018 08:14

A reconnect, as in the case of replacing a main switch for instance.

whereas a reliven would be as an isolation for safety in order to work around lines etc, such as a painter painting a house.

Regarding a reconnect, any ESC supplied before the installation is livened by faults would be invalid according to Reg 74(2)

Jul 12 2018 08:24

Replacing the main switch is not done by the linesman but by the electrical worker. So if I understand correctly, the linesco would deliven the mains by removal of the fuse, the electrical worker would replace the main switch (low risk PEW), re connect the conductors (the last PEW to allow current to flow) and issue the ESC IAW ESR 73A and 74A. Linesco would reliven the installation by reinserting the pole / pillar fuse.

ESR 74A (2) talks about disconnection / reconnection. Not delivening / enlivening. Removing the roadside fuse is not disconnection and reinserting it is not reconnection (despite what the retailers may say).

Jul 12 2018 08:33

Issue the COC for the linesman so he can see your test results etc and then when the site has been reliven sign the ESC part? Just because they are on the same piece of paper doesnt mean they have to be issued at the same time.

Jul 12 2018 09:00

Reg 74A (2) For the purposes of subclause (1), if an installation or part installation was disconnected from a power supply while the prescribed electrical work was done, the work is complete only once the installation or part installation is connected or reconnected to a power supply.

The reality in my view is that a LSA request for a ESC although not required by law, they own the network and are entitled to request whatever they want in order to connect the installation.
The fact that the ESC would in fact be invalid might suggest that a Certificate of Compliance although according to Reg 65(2) is not required for low risk electrical work may none the less be the best pathway forward for the LSA to request prior to relivening and then the electrical worker can complete the ESC once relivened.

Jul 12 2018 09:43

For the sort of work suggested, ie replacement of main switch or any fitting within the installation upstream of main switch(mains entry, meter, mains cable, etc); the sequence of events should be:

1 isolation for safety. If done at pole / pillar / pit; then done by person authorised by network operator (there\'s no such thing as a Supply Authority any more, they were written out more than 20 years ago). Generally just by isolation, rather than disconnection.

2 replacement of fitting, by electrical worker.

3 notification by worker to network that work is complete. NO CoC needed for replacement, as it is low risk PEW; but one can be issued if wanted.

4 re-livening by network-authorised person

5 ESC issued by electrical worker who did the connection of the fitting(s) replaced.

6 copies of ESC provided as required

Because only isolated, and not disconnected, the person re-livening is not doing any PEW so no requirement for any certification. And ESR 74A(2) does not apply to what they do; only to the connection of the replacement fittings.

If the network had actually disconnected, then there must be TWO ESCs.
One covering the replacement of the fittings (work on an installation / part installation); which must be issued by whoever connects them. Another issued by whoever re-connects to network (work on a fitting that supplies an installation); issued by whoever re-connects.

The point of clause (2) is to establish when the time for issuing ESC starts; ie when the work is complete.

The difference between isolation and disconnection is crucial; as is the fact that unless the N is disconnected as well as active(s) then the installation has NOT in fact been disconnected from supply. There is NO need to wait until re-livened before issuing an ESC.

An ESC issued before re-livening is perfectly valid; but if issued before connection to supply would be invalid because the declaration on it - that the (whatever) \"is connected to a power supply\" would be untrue.

If the network asks for a copy of the ESC for the work done while the installation was isolated / disconnected, that\'s up to them. They do not have a right to a copy, but they can ask. If they disconnect; then before re-connecting they must follow ESR73A. If the work done was general or high risk, they get to sight the relevant CoC & RoI (they are not entitled to a copy, but they can ask). but whatever paperwork they see and / or get copy of, does NOT relieve them of their obligations to do pre-connection checks as per ESR 73A.

The one bit of this that could be tricky is that IF (fully) disconnected from network (active(s) & N); then the ESC for the replacement of fittings within the network cannot be validly issued until installation is once more connected to supply.

But worth noting that unless N is disconnected, then the installation remains connected to a supply throughout.

Since even partial disconnection at pole / pillar / pit triggers need for ESC issued by person re-connection; and therefore forces network to accept, in writing, responsibility for stating that the entire installation \"is connected\", and \"is safe to use\"; they\'d be mad to do any more than isolate by removing fuse.

One point about safety isolation is that the network has NO way to know why isolation is requested(unless we tell them); they can\'t know whether any PEW of any sort was done . If no PEW was done, there can be no certificates for them to request.

Jul 12 2018 15:36

O2inspect, you should also read Reg 74c with regard to the issuing of ESC’s.

Issued as soon as practicable but no longer than 20 working days after connection.

So while the others referenced refs give information about what must be on the ESC 74C covers the acceptable timings.

Obviously the ESC will have to be issued on the spot if the relivener wants to see a copy of something.

Be aware that many lines companies out there have a poor understanding of the ESR’s and wiring rules and will confuse low risk main switch replacement with Mains work. They may insist on an Inspection and ROI prior to reconnecting or relovening the supply. Not worth the argument if you want the supply back on.
Certainly worth it after you get it back on and can muster the energy to go into battle with them.

When I was a lines company employed Inspector I enjoyed immensely challenging the “Power Board” mentality and refused many requests from the network to “ Inspect” low risk work.

I simply explained to the operator or lineman that was wanting the inspection prior to relivening that there logic was incorrect and they had no right to require an inspection for that type of work.
I would also tell them that I was happy to back that up in writing or in person with their supervisor or manager if they got in trouble.
Only has to do it a couple of times before word got around and things improved.