multiwire to detached structure

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electrofelon

electrofelon

Senior Member
Location
Cherry Valley NY, Seattle, WA
Occupation
Electrician
Do I have this right? If I want to run a 12/3 to a detached shed for, say, a split wired receptacle, do I need Grounding electrodes? Seems a bit ridiculous having to pound two ground rods and run a #8 up to my plastic nail on. I noticed 225.30 states that. "for the purpose of this section, a multi-wire branch circuit shall be considered a single circuit." But I see no such statement in 250.32.
 
Re: multiwire to detached structure

Hi electrofelon, You're correct if I believe the same is reference to a multi-wired split duplex receptacle.[210.7(B)] Could also be a single 240V receptacle.

rbj, Seattle
 
Re: multiwire to detached structure

In addition to what the others said, the 2005 clears this up quite nicely by adding that "for the purposes of this section, a multiwire branch circuit is considered one circuit".
 
Re: multiwire to detached structure

Luke warmwater, Can you give me a justification? Even if the multi-wire statement has been introduced in the 2005, if i'm under the 2002, it says one branch circuit. Don't get me wrong, I would love to not have to install groundrods, just trying to think of what this P.I.A. inspector I'm having to deal with might say and what my justificatoin would be.
 
Re: multiwire to detached structure

Branch Circuit, Multiwire. A branch circuit that consists of two or more ungrounded conductors that have a voltage between them, and a grounded conductor that has equal voltage between it and each ungrounded conductor of the circuit and that is connected to the neutral or grounded conductor of the system.
Click to expand...
Per the definition, a multiwire branch circuit is a circuit, not circuits.
Don
 
Re: multiwire to detached structure

Don has at least one, very keen eye.
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[ April 13, 2005, 08:14 AM: Message edited by: georgestolz ]
 
Re: multiwire to detached structure

This was clarifed in the 2005 NEC in Art 250, as it was clear by other code sections that grounding electrodes were not needed.
 
Re: multiwire to detached structure

Multi wire branch circuits has been "manipulated" in several different sections of the NEC.

2002 pages:

First read the definition on page 34.

Second read section 210.4(A) page 51 (permitted as multiple circuit - to help with the small appliance circuits requirement)

Third read 225.30 (again a single circuit) definitely helps with a 3-wire run to a garage in a dwelling unit situation. ;)

Fourth read240.20(B)(1)

Also read 300.13(B) device removal
 
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