TBL 310.15 (b)(6)

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Copperclad

Copperclad

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Merritt Island, FL USA
Hello All!
Im wondering if tbl 310.15 (6)(b) could be utilized to calculate the min. feeder size from a generator to a single family residence via a transfer switch?
Im hoping a #2 SER al. cable will suffice to feed a typical 200amp service if fused at 100amps at the genset?
 
Copperclad,

No, You can not use that table unless it's for the Main Power Feeder, meaning it serves

all the load of the dwelling.
 
well, shoot......
I was hoping to use up some shop stock, but I kind of knew I was grasping at straws!
All I know about the genset is its a 25kva 1phase 120/240 system. The system includes a man. transfer switch.
Thanks for helping me out!
 
Copperclad said:
well, shoot......
I was hoping to use up some shop stock, but I kind of knew I was grasping at straws!
All I know about the genset is its a 25kva 1phase 120/240 system. The system includes a man. transfer switch.
Thanks for helping me out!
Click to expand...

for a 25kva generator you will need a conductor rated at 120 amps from table 310.16 as per 445.13;)
 
iwire said:
You don't think the genset has a breaker?
Click to expand...

Most do, but they are usually the next size up, in this case 125 amps, on a generator that can only produce 104 amps continuously.
If we look at the exception, since it does have the breaker would we use the 104 amp rating? or do we have to size to the 125 amp breaker?
 
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