service calculation

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Mporter4

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I have been asked by the plant engineer to verify that they have enough capacity on there main switch gear to add some more load for some new equipment.
first of all I have issues with there electrical drawings.I have attached a copy of "one" of there panel schedules and would like to know if I am calculating this properly.
they have a total KVA of 35.56 on 480/277volt panel.to come up with how much load this panel would put on the main switchgear I multiplied 35.56*1000 /480/1.73= 42.82amps.

This panel would consume 42.82 amps from my main 1600 amp circuit breaker.
IS THIS CORRECT?;):-?
 
Mporter4 said:
I have been asked by the plant engineer to verify that they have enough capacity on there main switch gear to add some more load for some new equipment.
first of all I have issues with there electrical drawings.I have attached a copy of "one" of there panel schedules and would like to know if I am calculating this properly.
they have a total KVA of 35.56 on 480/277volt panel.to come up with how much load this panel would put on the main switchgear I multiplied 35.56*1000 /480/1.73= 42.82amps.

This panel would consume 42.82 amps from my main 1600 amp circuit breaker.
IS THIS CORRECT?;):-?
Click to expand...

It sounds about right, but until you get in there and take actual load measurements, you'll never be 100% sure. Do you have access to a data logger? A high amperage amp-clamp? If the facility is old and you haven't been there since day one, the panel schedules are basically useless because things could have been added or taken away over the years that you may be unaware of. Take your time and get as many measurements as possible.
 
I do have a data logger software,my amp probe is not big enough to accomidate the service size though.

I am concerned about loads that are not used but may be used after I have completed my test such as heat strips etc.
 
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