Electrical outlet standards

[tspan]

Is there a standard on dimensions of a duplex receptacle on a single yoke? We are looking to manufacture an additional circuit to be added to the back of a standard 5-15 outlet which would give us wireless control over it. According to the NEC and NEMA the receptacle counts as 2 conductors multiplied by the volumetric allowance for the largest wire in the box. I need to know how much volume the receptacle can take up to maintain compliance. For example in a 18in3 electrical box with 2 14/3 wires how large an area may the receptacle (mounted on a single yoke) use. Is this regulated?

Thanks in advance,

Teresa

 

[dbaird]

Link to Nema dimensions:

http://www.nema.org/stds/wd6.cfm

David Baird

Sr Controls Designer
EET degree.
Journeyman Electrician.

 

[tspan]

Thanks for that, I've actually read that standard and it regulates the face dimensions but not the depth. A NEMA representative suggested using GFCIs, etc as a guideline but as far as percentage of box thast can be filled or back clearance, it seems is not regulated.