Parallel sets spliced to feeder

[Grouch1980]

I'm pretty sure the answer is no, this is not a tap, but would like feedback:

There's an existing installation, with a #1 AWG feeder originating from a 3 pole, 100 amp breaker. The feeder goes to an apartment in a multi-family building. The feeder, inside the apartment, terminates in a splice box. In the splice box, 2 parallel sets of #4 AWG cables splice to the #1 AWG feeder, and go to the electrical panel. All conductors are copper.

I do not believe these 2 parallel sets are considered tap conductors, since the total ampacity of the paralleled sets (170 amps, using the 75 deg C column) exceeds the breaker rating of 100 amps. Am I correct? The 10 foot or 25 foot tap rules do not apply.

 

[infinity]

I do not believe these 2 parallel sets are considered tap conductors, since the total ampacity of the paralleled sets (170 amps, using the 75 deg C column) exceeds the breaker rating of 100 amps. Am I correct? The 10 foot or 25 foot tap rules do not apply.

You're correct that they're not tap conductors but since they're smaller than #1/0 they are not permitted as parallel conductors.

 

[ggunn]

In the splice box, 2 parallel sets of #4 AWG cables...

Parallel sets must be #1/0 or larger

 

[Grouch1980]

Thanks... and yes, agreed, they should've been a minimum of 1/0.

 

[infinity]

Who would parallel two sets of #4's when you could just use a single set of #3 for 100 amps.

 

[Grouch1980]

Who would parallel two sets of #4's when you could just use a single set of #3 for 100 amps.

It's one of those old buildings in Brooklyn, where you find surprises at every corner.