100A Service Wired With #4 AL?
#1
100A Service Wired With #4 AL?
I got a call earlier tonight because someone had no power in half their house, melted buss. (Guess who made that panel) Anyway, the service was done in #4 Aluminum service cable. Was this ever legal, or is this another fly-by-night install? I'm just curious as the service is getting switched out tomorrow morning, they're on jenny for the night.
#2
It may have been legal in cold weather states for extra heat. (you know... to keep the conduit warm)
No....never legal that I know of. It's definitely aluminum right..... not silver plated copper ?
No....never legal that I know of. It's definitely aluminum right..... not silver plated copper ?
#5
(Guess who made that panel) Anyway, the service was done in #4 Aluminum service cable. Was this ever legal, or is this another fly-by-night install?
No, the NEC has never allowed #4 aluminum for a 100 amp service. The use of antioxidant on aluminum connections is not a code requirement, but a good practice.
It's Aluminium from the 70s. AL is printed right on the cable.
#6
The panel? My first guess would be Zinsco or GTE Sylvania (same thing). Regardless, it has to be an aluminum bus panel if the bus has melted. Also remember seeing some older Federal Pacific panelboards with melted installation/mounting hardware and I mean melted, there was a pile of aluminum in the bottom of the can where the molten aluminum had dripped.
And here's what it is getting replaced with:

Last edited by Justin Smith; 11-05-14 at 09:38 PM. Reason: Add picture
#7
The stab on the panel for the 50A breaker that fed the subpanel literally is missing except for a few burn marks.
#8
And you are sure it was a copper bussed GE panel? 35 years ago I believe all GE panels had aluminum bus, but I couldn't swear to it. It's possible copper was an available option and I just never saw one. The copper stab was missing? I have seen a lot of aluminum bus destroyed by heat, but never seen a copper bus melted; burned, yes, but never melted.
#9
I would cut or remove the plugmold and install the panel closer to the right to avoid any extra splices.