310.15(B)7

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dglps

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Is 310.15(b)7 the proper table to use for SE cable as a feeder from a panel to feed a sub panel in an attached garage?
 

Dennis Alwon

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No you cannot use that table


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Dennis Alwon

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Chapel Hill, NC
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Retired Electrical Contractor
Here is the article


310.15(B)(7) 120/240-Volt, 3-Wire, Single-Phase Dwelling Servicesand Feeders. For individual dwelling units of onefamily,
two-family, and multifamily dwellings, conductors,
as listed in Table 310.15(B)(7), shall be permitted as
120/240-volt, 3-wire, single-phase service-entrance conductors,
service-lateral conductors, and feeder conductors
that serve as the main power feeder to each dwelling unit
and are installed in raceway or cable with or without an
equipment grounding conductor. For application of this section,
the main power feeder shall be the feeder between the
main disconnect and the panelboard that supplies, either by
branch circuits or by feeders, or both, all loads that are part
or associated with the dwelling unit. The feeder conductors
to a dwelling unit shall not be required to have an allowable
ampacity rating greater than their service-entrance conductors.
The grounded conductor shall be permitted to be
smaller than the ungrounded conductors, provided the requirements
of 215.2, 220.61, and 230.42 are met.
 

Dennis Alwon

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Location
Chapel Hill, NC
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Retired Electrical Contractor
Yes but read the article I posted. If the feeder carries the entire load of the dwelling then you can use 310.15(B)(7). It must do all loads associated with the dwelling
 

GoldDigger

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Location
Placerville, CA, USA
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Retired PV System Designer
Possibility not covered is service disconnecting means outside and "subpanel" in garage, which carries entire dwelling load... ???
True, but only if the OP's "panel" is nothing but a service disconnect and does not supply any loads or feeders other than the one to the garage "subpanel".
 
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