I'm thinking of using an un-conduit-ed SER cable to feed a 100A sub-panel to avoid running 3 separate THHN cables through an EMT conduit (+ maybe a redundant ground).
The panels are 3ft away from each other and the total cable will be 12ft long. I'll be using 3-3-3-5 CU SER cable and running it through the 2 studs in between the panels.
Other specs: The max use load won't exceed 80A. The sub-panel is 225A rated (value pack from a local big store, cheaper then the 12ft SER cable). All of the breakers should be properly rated at the 75deg requirements.
Thx for your input.
Right, perhaps I should better rephrase the question: will I pass inspection if I run a SER cable in between panels without being enclosed in a metal conduit?
I should have mentioned that my current “main” electric panel is actually a sub-panel itself: the proper neutral-ground bonded main panel is outside next to the meter. It has only one 200A breaker feeding the panel in my basement with a SER cable that is not conduit protected.
That’s how I got the idea that I could feed the new sub-panel with a SER without conduit in between. As you can see from the picture my current panel is fed through the ceiling, around the top plate of the unfinished wall and into the first sub-panel without any conduit protection. Then my electrician mentioned that we should add a conduit between the old and the new sub-panel.
So now I’m wondering if the old SER cable coming from the ceiling should be in a conduit, or If I should add a conduit now.
Alternatively, could I use flexible conduit instead of ridged EMT and pass inspection? Using three #4 insulated AWG THHN cables plus one bare ground cable inside?
Per Manassehkatz’s question: a 2-2-2-4 aluminum SER would be MUCH cheaper but I heard that aluminum SER is more prone to overheating so for $40 more I would rather be playing it safe.
Which contradicts my original question because if I do want to be safer I should enclose everything in a conduit ;)