I need a 480 volt supply for a new machine. I have a 575 to 480 transformer already in my substation, which is marked for facility use. All my plant lighting comes from here. Breakers were sized and installed to support future needs that are not being used. Is it acceptable to use one of these spare breakers to power a panel for machine use? I would not be using any of the breakers labeled lighting panel, but I would be using power supplied by the 480 volt facility use transformer.
480 volt supply
- Thread starter jhill4751
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Re: 480 volt supply
Where are you located. I have never heard of 575 volts. Must be a local phenom.
Anyway, sure, use it if the panel has the excess capacity, not just the spaces for the breaker, but for the calculated additional load to the current load on the panel. Lighting or power panels are named such in 408.14. You won't be challenging the classification of your panelboard by adding this one branch circuit.
Where are you located. I have never heard of 575 volts. Must be a local phenom.
Anyway, sure, use it if the panel has the excess capacity, not just the spaces for the breaker, but for the calculated additional load to the current load on the panel. Lighting or power panels are named such in 408.14. You won't be challenging the classification of your panelboard by adding this one branch circuit.
Ed MacLaren
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Re: 480 volt supply
575 volts is the equipment rating, or "utilization voltage" for equipment, such as motors, transformers, etc, that are supplied from a 600/347 volt system.
In other words, 575 is to a 600 volt system, what 460 is to a 480 volt system.
The 600/347 volt system is the standard for commercial/industrial/institutional services in most parts of Canada, instead of the 480/277 volt system common in the USA.
The advantage is less amps per kva, permitting smaller wires, or reduced losses.
Ed
[ November 13, 2003, 06:09 PM: Message edited by: Ed MacLaren ]
575 volts is the equipment rating, or "utilization voltage" for equipment, such as motors, transformers, etc, that are supplied from a 600/347 volt system.
In other words, 575 is to a 600 volt system, what 460 is to a 480 volt system.
The 600/347 volt system is the standard for commercial/industrial/institutional services in most parts of Canada, instead of the 480/277 volt system common in the USA.
The advantage is less amps per kva, permitting smaller wires, or reduced losses.
Ed
[ November 13, 2003, 06:09 PM: Message edited by: Ed MacLaren ]
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