445.13 Generator Conductor Ampacity

[MME-elec]

For multiple taps of a generator, is it the intent of the code that each set of taps be rated not less than 115% of the generator rating?
Have a situation where an existing generator feeder is not fully rated based on generator capacity, but is undersized to add any more significant load. I want to add a 2nd tap for a fire pump whose required feeder size is also less than the generator capacity. (I've established that the generator can support the entire existing + fire pump load.) An inspector is requiring the fire pump feeder to based on generator rating rahter than pump load rating.

 

[Gregg Harris]

For multiple taps of a generator, is it the intent of the code that each set of taps be rated not less than 115% of the generator rating?
Have a situation where an existing generator feeder is not fully rated based on generator capacity, but is undersized to add any more significant load. I want to add a 2nd tap for a fire pump whose required feeder size is also less than the generator capacity. (I've established that the generator can support the entire existing + fire pump load.) An inspector is requiring the fire pump feeder to based on generator rating rahter than pump load rating.

Take a look at Artical 695 section 695.3

 

[Smart $]

Where is the first overcurrent protection device? If the taps are to or after that device. 445.13 does not apply.

The confusing part of 445.13 is that it states, "The ampacity of the conductors from the generator terminals to the first distribution device(s) containing overcurrent protection..." Many incorrectly (IMO) interpret this as meaning the load terminals of an incorporated OCPD. The premise of my opinion is an OCPD is not a generator . Just because the generator and OCPD share the same housing does not make their function something different :thumbsup: