Any Logical Reasoning

A

Alwayslearningelec

Senior Member
Location
NJ
Occupation
Estimator
If the engineer is calling for a 400A switch in a switchboard to feed a 400A panel and VD is not an issue and they are calling for (2) sets of #500 is there any logical reasoning for this? Those feeders could handle 760A. Is it because of possibly changing things in future and installing equipment requiring more power and they would be covered?
 
You'll have to ask the engineer. Perhaps there are plans to upgrade the panel in a future project.
 
Alwayslearningelec said:
If the engineer is calling for a 400A switch in a switchboard to feed a 400A panel and VD is not an issue and they are calling for (2) sets of #500 is there any logical reasoning for this? Those feeders could handle 760A. Is it because of possibly changing things in future and installing equipment requiring more power and they would be covered?
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Since the feeder originates at a 400 amp switch (although it could be) I doubt that future expansion is being considered. As Charlie said ask the engineer.
 
Alwayslearningelec said:
Right but they could always swap out the switch later.
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What size EGC are they indicating on the plan? Also, unless they left space in the switchboard above or below the 400 or have a spare 800 switch already in the switchboard what's the point? A 800 amp switch will not fit in a 400 amp switch location.
I would ask the engineer for sure.
 
Knightryder12 said:
What size EGC are they indicating on the plan? Also, unless they left space in the switchboard above or below the 400 or have a spare 800 switch already in the switchboard what's the point? A 800 amp switch will not fit in a 400 amp switch location.
I would ask the engineer for sure.
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Not sure but I will check.....good point on then spare and spaces.
 
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