Code or Myth

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bwyllie

Senior Member
Location
MA
I hear from time to time people say that the NEC requires 10% capacity in panelboard breaker spares and/or amperage capacity on a feeder. I cannot find it in the code, has anybody run across this or is this more of a good engineering practice?
 
infinity

infinity

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Location
New Jersey
Occupation
Journeyman Electrician
It maybe a good engineering practice to provide some room for future expansion but it's not required by the NEC. Personally if I were a client I would expect an engineer to provide some room for future expansion without asking.
 
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