Unusual specification.

[Klem531]

Hello, 25 year IBEW Journeyman here. Currently working in the office of a small contractor estimating jobs. Anywho, I came across a head scratcher today whilst doing a take off. There is a spec that states: "In order to reduce short curicuit, the electrical contractor shall route 30ft of #12awg wire for each power and lighting branch circuit connected to the lighting control panel. Run wire from panel, up to joist space, loop and route back down to the L. C. P. ".
Has anyone come across something like this? Thanks.

 

[infinity]

Yes I've seen this for lighting panels. It believe that it has to the with the 5000 amp SCCR rating of the panel. Someone will chime in with the details

 

[LarryFine]

Welcome to the forum.

No, not in branch-circuit wiring.

 

[MyCleveland]

Looks like the EE cannot provide any calc so he adds this ridiculous feature into the design.

If your source panel for the lighting ccts had a full 65k available & X/R = 3 ...
277/480 -> outbound #12 CU
10' - 6395A
15' - 4403A
20' - 3353A
120/208 -> outbound #12 CU
10' - 2922A
15' - 1972A
20' - 1488A