Three phase

[andy]

when you lot wire a 3 phase DB, do you use the number tape on the earths/neutrals?

and do you have a picture of a properly wired DB?

 

[Big_Spark]

when you lot wire a 3 phase DB, do you use the number tape on the earths/neutrals?

and do you have a picture of a properly wired DB?

I sometime use numbers to indicate conductors, however if the board is terminated correctly then there is no need as the Neutral and CPC conductors should be terminated in the corresponding terminal. For 3 Phase breakers I always put the Neutral and CPC in the middle terminal of the three ways that the breaker occupies.

Do I have a picture of a correctly terminated board? Nope, I do not photgraphs things without good reason, and this is usually for reports when things are not right...However I may have a hunt through file pictures to see if I have any..

 

[andy]

For 3 Phase breakers I always put the Neutral and CPC in the middle terminal of the three ways that the breaker occupies.

er... what?

 

[pdcelec]

If you dont understand what he said, get someone who does to connect up

 

[plugwash]

when you take a 3 phase cuircuit from a 3 phase board you use a 3 pole common trip MCB which takes 3 positions in the board to give you the 3 phase cores you need but your cuircuit only has one neutral.

 

[kai]

If you are wiring a "Section 607" circuit with a high integrity duplicate earth, the two earth cables have to occupy separate holes on the earthing block, with the 2 outermost holes on the appropriate numbered way on the main earth bar being used, one for each earth lead.

 

[ban-all-sheds]

If you dont understand what he said, get someone who does to connect up

I'm with Andrew on this one.

Disclaimer - I have no 3-phase experience, and little knowledge, as I've never needed to fiddle with 3-phase systems, so if my breath has a high methane content, feel free to tell me so, but...

For 3 Phase breakers I always put the Neutral and CPC in the middle terminal of the three ways that the breaker occupies.

Wouldn't a 3-way breaker only have terminals for L1, L2 & L3, and a TP&N breaker take 4 ways?

And Neutral and cpc connected together - are 3-phase installations commonly TN-C?

Do I have a picture of a correctly terminated board? Nope, I do not photgraphs things without good reason, and this is usually for reports when things are not right...However I may have a hunt through file pictures to see if I have any..

Shouldn't really give plug a hard time - it wasn't his board - he just linked to a Wikipedia article...

 

[pdcelec]

What FWL meant was

1: connect up the three phase conductors to the three terminals in the three pole mcb in the correct phase order eg terminals 13,14,15

2: connect the neutral conductor to the associated terminal in the neutral rail and connect to the central one i.e 14 in this example

3: connect the cpc to the associated terminal in the earth rail and connect to the central one i.e 14 in this example

 

[supersparks]

on a TP board say its 4 way, that means 4 ways for 3 phase breakers so infact you have 12 SP ways, so on the N bar you will have 12 holes, on earth you will have 12 again, so, if you use a 3ph breaker you will have a choice of 3 holes.

my personal preference is to use the first way, but its down to installer rather than any safety reason, anyone encountering jims way could see the sence in it, as they could mine, using the 3rd hole would be just as acceptable but i cant see any reasoning behind it

as for a 3ph board, heres one done a while back, bit of a rush, but its all about the £££

 

[supersparks]

beaten to it by pdcelec

and i can't show everyone a piccy because this site blocks all references to ask the trades .co.uk STILL

http://www.ASK THE TRADES.co.uk/P3010006.JPG

for those of you who want to see the picture

 

[ban-all-sheds]

What FWL meant was

1: ..
2: ..
3: ..

Now I see. Thanks for that, and sorry about the smell...

 

[andy]

What FWL meant was

1: connect up the three phase conductors to the three terminals in the three pole mcb in the correct phase order eg terminals 13,14,15

2: connect the neutral conductor to the associated terminal in the neutral rail and connect to the central one i.e 14 in this example

3: connect the cpc to the associated terminal in the earth rail and connect to the central one i.e 14 in this example

thats what i would do aswell... just when you said connect them to the middle i was thinkin of something else... (as in it would go bang when switched on...)

 

[andy]

beaten to it by pdcelec

and i can't show everyone a piccy because this site blocks all references to ask the trades .co.uk STILL

http://www.ASK THE TRADES.co.uk/P3010006.JPG

for those of you who want to see the picture

thats too neat.... but then there arent many cables going in.... ill post a piccy of the last 3 ohase board i done later (as in once i can be bothered to copy the pic from my phone to PDA then PDA to computer the computer to internet...

 

[supersparks]

yeh same, ive got one from a few months ago, whole setup, 12 3ph way board, coupled to a 4 way 3ph board and an external switching timer.

sadly, before i took the pic somone came and added a 25mm 4 core armoured and messed it all up and it looked ****e (used the photo to slag the workmanship lol)

so i wont bother posting that

 

[andy]

yeh same, ive got one from a few months ago, whole setup, 12 3ph way board, coupled to a 4 way 3ph board and an external switching timer.

sadly, before i took the pic somone came and added a 25mm 4 core armoured and messed it all up and it looked s***te (used the photo to slag the workmanship lol)

so i wont bother posting that

i put the armoured in before wiring the rest...