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As I understand it CA now requires AFCI protection for practically all residential outlets.

I'm setting up my theater room and it calls for a 50A 220V NEMA 6-50 outlet for the subwoofer I want but I'm having trouble finding an AFCI breaker in this size.

I know this isn't the right place for product recommendations; I guess I'm more fishing to see if there are exceptions I'm missing?

  • Is the circuit run in metal conduit all the way from the panel, and hardwired to the subwoofer? – Harper Oct 30 '18 at 8:16
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    Just for reference can we have a link to that sub-woofers product page? You’ve piqued my interest! I follow theater room trends and I’ve not heard of this. – Tyson Oct 30 '18 at 9:59
  • @Harper No. It runs to a plug that the subwoofer connects to with a cord. – Matthew Oct 31 '18 at 3:23
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    Page 28 of the manual (pdf page 33 of 88) only calls for a 15 amp 240v receptacle (not 50 amp NEMA 6-50). That makes a lot more sense..... – Tyson Oct 31 '18 at 3:35
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    Yeah, that doesn't work that way. You can't put a bunch of 15A or 20A receptacles on a 50A circuit. If you need to provision power to multiple devices made to use a 15A or 20A circuit, either run multiple circuits or feed a subpanel. Yes, all that applies to 240V circuits also. Same rules. – Harper Oct 31 '18 at 5:46
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NEC AFCI requirements only apply to 120V, 15/20A circuits

NEC 210.12(A) is clear on this (list omitted):

(A) Dwelling Units. All 120-volt, single-phase, 15- and 20- ampere branch circuits supplying outlets or devices installed in dwelling unit kitchens, family rooms, dining rooms, living rooms, parlors, libraries, dens, bedrooms, sunrooms, recreation rooms, closets, hallways, laundry areas, or similar rooms or areas shall be protected by any of the means described in 210.12(A)(1) through (6):

Furthermore, a quick check of the 2016 CEC reveals that it hews to the 2014 NEC language with no state amendments (the quote above is from the 2017 NEC).

  • That's interesting as, presumably, there's nothing preventing outlets of higher ratings being installed. Thanks! – Matthew Oct 31 '18 at 3:25

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