3 Phase meter cable identifying

[westie101]

It is quite common to have L1, L3, L2 rotation in these parts, I think it just depended on what side of the bed the DNO man (Westie icon_lol.gif) got out of!

Yes some parts are like that with all sorts of crosses on our network to correct it!

The bit I mainly work in is by far for the greater majority standard L1, L2, L3.

 

[Spark123]

I think the DNO have changed their colour schemes over the years, on some plans I have some supplies are RYB, R, Y, G, BL, W.

 

[Lectrician]

Getting the neutral wrong would cause issues though!

If it's live, one can surely ascertain which is neutral with a voltmeter?

one submain had two phases connected to one phase in busbar chamber.

Bang?! I think I must be misunderstanding you!

Kind Regards, John

If you have four tails sticking out at you ready to connect to a meter, they are not going to be live, and beeping them out is going to be required. Ericmark said it wouldn't make much odds getting the phases muddled, and while this is *kind of* true, if all the tails are black, confusing the neutral up with the phases is a possibility.

The L1 and L2 outgoing to a switch fuse both on the L1 phase, so you effectively had L1 L1 L3 at the DB. No bang

 

[JohnW2]

If you have four tails sticking out at you ready to connect to a meter, they are not going to be live ...

True, but that's not actually what the OP described. he said that the four black tails were coming out of the load side of a meter - although, again, one would hope that they were not live!

Ericmark said it wouldn't make much odds getting the phases muddled, and while this is *kind of* true, if all the tails are black, confusing the neutral up with the phases is a possibility.

That's true, but I misunderstood which bit of eric's post you were responding to. He was talking about using a phase rotation meter, which presumably implies a live supply - in which case, as I said, determining which was neutral would not be a problem.

The L1 and L2 outgoing to a switch fuse both on the L1 phase, so you effectively had L1 L1 L3 at the DB. No bang

Sure - as I said when I mentioned the bang, I was obviously misunderstanding - I was taking your words "two phases connected to one phase" a bit too literally

Kind Regards, John

 

[Lectrician]

When he said "Load side", I assumed he just meant the consumers side, as opposed to the suppliers side.

He also said disconnected, so assumed he meant disconnected from the meter.

He also mentioned the tails went to the DB, so I assumed connected that end still - "The 4 tails are ran to a 3 phase DB located in another room."

 

[JohnW2]

When he said "Load side", I assumed he just meant the consumers side, as opposed to the suppliers side. He also said disconnected, so assumed he meant disconnected from the meter. He also mentioned the tails went to the DB, so I assumed connected that end still - "The 4 tails are ran to a 3 phase DB located in another room."

On relection, I suppose it's anyone's guess as to what he meant. I took him to mean that the tails were still connected to the meter, but had been disconnected from whatever they were previously connected to.

If you're interpretation is right, and he has the ends of 4 disconnected conductors near the meter, t'other ends of which go to a 3-phase DB, then surely all he needs to do to identify the conductors is to check continuity between the loose ends and the connections in the DB?

Kind Regards, John

 

[westie101]

Going back to the OP, the general standard for 3 phase meter terminals is: -
L1 in
L1 out

L2 in
L2 out

L3 in
L3 out

N in
N out

if that's any help