Multi Family Feeder Size

[rikcoop]

I have a Multi Family Apartment complex with Dwelling units having a load of 84 amps. Feeder size is #1 AWG aluminum with a 100 Amp breaker. Inspector is stating that a 100 Amp breaker can only have an 80% load or 80 amps on it. Is this correct?

 

[Dennis Alwon]

I have a Multi Family Apartment complex with Dwelling units having a load of 84 amps. Feeder size is #1 AWG aluminum with a 100 Amp breaker. Inspector is stating that a 100 Amp breaker can only have an 80% load or 80 amps on it. Is this correct?

If the load is continuous load then you can only have 80 % but in your case the calculated load is not continuous. I say the inspector is incorrect

 

[rikcoop]

Would that be per 215.3? If anyone has a code reference to back up my stance, I would be greatly appreciate it.

 

[peter d]

Inspector is stating that a 100 Amp breaker can only have an 80% load or 80 amps on it. Is this correct?

No, not correct at all. As for the code reference, he is using an incorrect interpretation of a continuous load. He is on the hook to prove his case to you (which will be impossible.)

 

[Dennis Alwon]

How about this article

210.20 Overcurrent Protection.
Branch-circuit conductors and equipment shall be protected by overcurrent protective devices that have a rating or setting that complies with 210.20(A) through (D).
(A) Continuous and Noncontinuous Loads. Where a branch circuit supplies continuous loads or any combination of continuous and noncontinuous loads, the rating of the overcurrent device shall not be less than the noncontinuous load plus 125 percent of the continuous load.
Exception: Where the assembly, including the overcurrent devices protecting the branch circuit(s), is listed for operation at 100 percent of its rating, the ampere rating of the overcurrent device shall be permitted to be not less than the sum of the continuous load plus the noncontinuous load.

 

[petersonra]

doesn't the load calculation already cover this?