Dedicated AC line - Contractor wants to use BX instead of romex

Look at page 16. Read pages 31 thru 36.
https://centralindianaaes.files.wordpress.com/2012/09/indy-aes-2012-seminar-w-notes-v1-0.pdf

I would argue many should read all of this ... about 15 times!  Maybe something will sink it. Worst case, they may give more though to their purchases.


One thing from this presentation is why lots of separate runs are a bad idea as they likely also have separate runs for the ground. That is a good way to induce more voltage difference between grounds. Do a heavy gauge run to a small sub-panel and plug everything in there.

jea48, aluminum or steel clad?

Hello,
My recommendation is put the Romex in a bx shield. Basically do both. You can prevent the mice and have the good cable. This should be legal. 

@ dletch2

https://cdn.cableorganizer.com/old-images/midatlantic/PowerSolutions-middle-atlantic.pdf

MC cable is manufactured in both steel and aluminum. “Steel-Clad MC” cable with insulated ground wire is the best choice for AV systems. It has twisted conductors that help reduce AC magnetic fields, however the steel jacket is what helps most.

Read pages 6 through 9.

FWIW I have read on audio forums that steel conduit tends to take some of the air out of the music where aluminum does not. Therein why some like to use Romex instead of steel conduit.

Aluminum still gives you some RF shielding from airborne RFI entering the cable. Just install the MC aluminum armor cable like you would install Romex cable. Keep it at least 8" to 12" from existing parallel running branch circuits. Even further from lighting branch circuits that use dimmers and or transformer based LED lights. That includes the switch leg side of the circuit.
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