[RE-wrenches] Feeder without a dedicated breaker

[Drake]

Romex sheath is not generally considered much protection.  The intent 
of the code is that the tap wires that are not adequately protected 
by the feeder over current protective device have hardened physical 
protection.  My read is that they need to be in conduit or some 
substantial enclosure.


>Also at issue is the question: is the romex wire protected "by other 
>means"?  Judgement call.
>
>See citation below from 240.21(B):
>
>(2) Taps Not over 7.5 m (25 ft) Long. Where the length of
>the tap conductors does not exceed 7.5 m (25 ft) and the tap
>conductors comply with all the following:
>(1) The ampacity of the tap conductors is not less than
>one-third of the rating of the overcurrent device protecting
>the feeder conductors.
>(2) The tap conductors terminate in a single circuit breaker
>or a single set of fuses that limit the load to the ampacity
>of the tap conductors. This device shall be permitted
>to supply any number of additional overcurrent devices
>on its load side.
>(3) The tap conductors are protected from physical damage
>by being enclosed in an approved raceway or by other
>approved means.
>
>End of citation
>
>William Miller
>
>
>
>
>
>
>
>At 01:06 PM 10/25/2011, you wrote:
>>William,
>>
>>The tap conductor ampacity must not be less than the rating of the breaker
>>protecting that circuit, which in this case (if I understand the 
>>configuration
>>correctly) would be the main breaker in the panelboard.
>>
>>Any smaller gauge would require its own OCP device of appropriate rating
>>if it's to be code-compliant.
>>
>>Dan
>>
>>
>>
>>--- On Tue, 10/25/11, William Miller <william at millersolar.com> wrote:
>>>
>>>From: William Miller <william at millersolar.com>
>>>Subject: Re: [RE-wrenches] Feeder without a dedicated breaker
>>>To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
>>>Date: Tuesday, October 25, 2011, 2:54 PM
>>>
>>>Jamie:
>>>
>>>Thanks for getting me started.  I did not think to consider this 
>>>as a tap, but it appears to match the criteria.
>>>
>>>William Miller
>>>
>>>
>>>
>>>At 11:38 AM 10/25/2011, you wrote:
>>>>William, I would start with Article 240.21(B).
>>>>
>>>>Jamie Johnson
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>
>Miller Solar
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>email: william at millersolar.com
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Drake Chamberlin
ATHENS ELECTRIC LLC
OH License 44810
CO license 3773
NABCEP Certified PV
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