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Discuss 3 phase db converted to single phase with 10mm earth in the Electrical Forum area at ElectriciansForums.net

D

daveelectrician

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Hi.Today during my job at a police station, took cover off brand new KQ 3 phase SquareD db (recent db change by different firm) to connect my new ring to one of the ways and found that the 3 phase db had been converted to single phase. 25mm double insulated tails live and neutral, L1, L2 and L3 linked out using some 10mm earth cable. To me i would say that is a c1 fault, so refused to make my circuit live until c1 was rectified. What is everyones opinion on this and does anyone know if there is a linking kit available from schneider.
 
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DNS1

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Arms
If all 3 phases are connected together and to the line side of the incommer, surely that means 415v for the whole system?!

I'm not an expert in 3 phase, but that just sounds plain wrong (and that's before we get to using 10mm earth as a line conductor!)
 
K

Knobhead

  • Thread Starter Thread Starter
  • #3
Have you been in touch with Schneider?

It's not unusual to convert a board like this. One danger is the neutral rail being overloaded.
 
K

Knobhead

  • Thread Starter Thread Starter
  • #4
If all 3 phases are connected together and to the line side of the incommer, surely that means 415v for the whole system?!

I'm not an expert in 3 phase, but that just sounds plain wrong (and that's before we get to using 10mm earth as a line conductor!)
How do you work that out?
 
M

Mark_Burgess

  • Thread Starter Thread Starter
  • #6
There is some rough work out there, what an idiot.
 
G

Guest123

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  • #7
Single phase conversion kits are available when using a 3p DB with a 1p supply.

Linking out using 10mm is dog rough but not a C1 imo.

Sent from my HTC Desire C using Tapatalk 2
 
R

Richard

  • Thread Starter Thread Starter
  • #8
If all 3 phases are connected together and to the line side of the incommer, surely that means 415v for the whole system?!

I'm not an expert in 3 phase, but that just sounds plain wrong (and that's before we get to using 10mm earth as a line conductor!)

No I think the Op means that it's a three dis board fed by a single phase and neutral...no?
 

DNS1

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Arms
No I think the Op means that it's a three dis board fed by a single phase and neutral...no?
Oh, ok, that makes more sense... It sounded like he was talking about a single phase board being fed by all 3 phases!

My bad!

:blush5:

I really shouldn't use this forum after beer...
 
B

Bobster

  • Thread Starter Thread Starter
  • #12
Deleted (cos I was being stupid!)
This is true, but it sounds like a 3ph dis board which has been converted to single phase.

The supply to it will be single phase line, neutral all that's been changed in the board is the 3 bus bars internal to the db have been linked together, albeit roughly.
 
D

daveelectrician

  • Thread Starter Thread Starter
  • #13
Thanks everyone for your replies. Will ring schneider tomorrow to see if there is a linking kit. Thought it was a C1 as 10mm not rated 100 A
 
B

Bobster

  • Thread Starter Thread Starter
  • #14
The boards rated at 100a across three phases. What protection is on the supply cable?
 
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