industrial distribution boards
industrial distribution boards
(OP)
always have trouble understanding 3phase distribution boards that supply other 3phase boards which supply either other boards or directly to electric motor isolators. very new to me at the moment. anyone have any rough guides as to loading and supplies, always in factories and industrial premises. very large subject but any practical guides would be appreciated.
many thanks
cn100
many thanks
cn100





RE: industrial distribution boards
Then we can discuss loading.
RE: industrial distribution boards
thanks
cn100
RE: industrial distribution boards
A 30A three-phase circuit implies 30A PER PHASE. So each conductor must be rated for 30A.
In a three-phase panel, you could have three-phase breakers (3-pole), or single-phase breakers (2-pole and 1-pole). A 2-pole breaker provides line-to-line voltage, so in a 208/120V panel, it would provide 208V, while a 1-pole breaker provides line-to-neutral voltage, in this case 120V.
RE: industrial distribution boards
You use a large ampere panel to feed a smaller panel. basically because you may need more circuit breakers than is available on a large ampere single panel and for a lot of other reasons. Panel boards were invented to provide a organized means of protection on all circuits used in a system otherwise you would have many many more fused disconnects all over the place like was done back in the turn of the century.
All this is determined by connected loads and codes and a lot more.
If you are in this business you need to take a good NEC code class it would explain this matter and would really really help.
good luck
RE: industrial distribution boards
now back to the question, then is it possible to look at the main cable feeder rated at say 125A into a dis. board
and add up all existing outgoing loads. so long as total does not exceed 125A then it's ok to keep loading up board.or how much diversity can be allowed on a common sense basis.
thanks
cn100
RE: industrial distribution boards
Consulting Application Catalog
or you can go here and download one.
ht
It's a catalog for sure, but it very infromative and with pictures.
RE: industrial distribution boards
So you have to determine how much load will run simultaneously and come up with appropriate load estimate. According to most Codes (NEC definitely)you should size the feeders and equipment for 125% of the caclulated loads.
More further down (away from main serice and closer to indidual loads) the diveristy factor rises.