Code Question Of The Day

Subject: Article 240.21 (B)

Charlie,

I love your code question of the day, keep up the good work. I will keep my question short and sweet. Does the feeder tap rule permit tapping a lug of a disconnect or meter enclosure or for that matter any equipment lug or busbar? The code says “Conductors shall be permitted to be tapped…” What say you??

Thanks
Paul

Paul Cameron
Chief Electrical Inspector
Pasco County

Subject: 314.28 (A)(2)

Can you explain what the last paragraph in 314.28(A)(2) is talking about? It states "When transposing cable size into raceway size in 314.28(A)(1) and (A)(2), the minimum metric designator (trade size) raceway required for the number and size of conductors in the cable shall be used."

How do you transpose cable size to raceway size?

Thanks,
Gary Beckstrand
UEJATC

Hi Gary, Thanks for participating. Section 314.28 relates to sizing of junction boxes and shows the requirements for the distance between raceway entries. Where cable assemblies are used instead of raceways, 314.28(A)(2) explains the method to be used when transposing (changing) the cable size into raceway size. The minimum trade size raceway required for the number and size of the conductors in the cable must be used. For example, if you have a cable containing four 3/0 AWG THWN conductors you must determine the minimum size raceway that would be required for those conductors. Annex C, Table C requires a 2” conduit for those conductors.

NECA is in the process of creating and revising several NEIS (ANSI approved standards), and would like you to participate in this process!

Below is a listing of all standards in the process of being published or revised, if you feel that you would like to be involved in the review process, please contact Aidan McCallion at 301-215-4549 or by email at Aidan.McCallion@necanet.org.