H
High Tower
I stand corrected mate!, I'm not going to argue with that !!.
My sentiments still stand on assessment of environment.
My sentiments still stand on assessment of environment.
K
Knobhead
Like anything our old friend diversity comes out to play and you have to play with it.
I’ve lost count of the 3 ½ core SWA’s I’ve put in, never had a problem with the neutral even 20 years later.
I’ve lost count of the 3 ½ core SWA’s I’ve put in, never had a problem with the neutral even 20 years later.
H
High Tower
V
VoltzElectrical
That's just it. failure to read the OP properly. I have fitted a TPN board off a single phase supply with the conversion kit supplied from the same manufacturer of the board (Dorman Smith).
Jumping the gun again folks.
N
netblindpaul
Not quite jumping the gun, I responded to a post that was going off topic a little, I admit, which then sent the thread not just off topic a little, but it seems a LOT! 
IF the board is correctly & fully single phased, then that is fine as mark ju has said, it is then simply say a 12*3, i.e. 36 or xx way 1ph DB, however, running just single phase loads across 3 phases on a 3ph db with a sub main etc. designed to take a 3ph load is not really OK.
IF the board is correctly & fully single phased, then that is fine as mark ju has said, it is then simply say a 12*3, i.e. 36 or xx way 1ph DB, however, running just single phase loads across 3 phases on a 3ph db with a sub main etc. designed to take a 3ph load is not really OK.
V
VoltzElectrical
Not quite jumping the gun, I responded to a post that was going off topic a little, I admit, which then sent the thread not just off topic a little, but it seems a LOT!
IF the board is correctly & fully single phased, then that is fine as mark ju has said, it is then simply say a 12*3, i.e. 36 or xx way 1ph DB, however, running just single phase loads across 3 phases on a 3ph db with a sub main etc. designed to take a 3ph load is not really OK.
Of course is it not ok to run all loads on a 3 phase board across one phase. Basic electrical training would tell you that you would overload the neutral, just as balancing all 3 phase loads results in no load on the neutral at all. I just don't know why anyone assumed this was the case.
As I said, It's quite common on larger jobs to use a 3PN board with a single phase incoming supply and linking kit to give a larger capacity board.
smiley face.
K
Knobhead
Voltz this was the point is the point I was trying to get across.
The board may have been designed correctly but as I found to my cost extras do get added.
With me it was a common 115V control supply to 21 various panels. I used a 3Ph 24 way board as described above. A great big engraved label on the front “Primary Control Circuits ONLY”. The supply was end tapped so not suitable for power outlets.
All was fine when I left it and went on my wandering around the company for a year or so. I arrived back to be informed the 12.5KVA 433/115V transformer had caught fire and a new 17.5KVA installed.
The original 3 spare ways had sub-boards connected to them, all supplying power outlets. It wasn’t a big thing to put right, a new DP board fed off a centre tapped 433/115V transformer.
The stupid thing is the sub-boards were DP, surely the fact that they were fed off a SP+N board must have set alarm bells ringing?
Since then I’ve had a thing about “who will follow me” and so went totally off the concept of using boards in such a way.
Would have loved to have been there when the transformer caught fire, every section of the plant shut down at once.
The reason for the common control supply was simply to ensure each panel didn’t have different potentials on the control supply. All the panels were cross linked, the central desk had all 21 different control supplies on multiple feeds.
PS couldn't resist putting a smiley in the quote :38:
G
GLENNSPARK
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