[Shop-talk] Electrical install questions

[Jeff Scarbrough]

Are fuses required? I've seen plenty that are just a pull-out handle...
On Jul 31, 2015 11:36 PM, "David Scheidt" <dmscheidt at gmail.com> wrote:

> On Fri, Jul 31, 2015 at 6:15 PM, Steve Hammatt, Mount Vernon WA USA
> <gsteve at hammatt.com> wrote:
> > Need to hook up home central a/c located in my (temporary) shop/garage.
> > New shop and extra garage space is to be soon added to our property.
> > The installation will be handled by a local HVAC contractor (using an
> outside
> > electrical contractor) or option is to allow the homeowner (me) to
> supply the
> > power from the panel to the electrical shutoff mounted on the outside
> wall
> > of the garage, next to the condenser.  We have a dedicated 30A 240V
> circuit,
> > previously used for an electric clothes dryer (now switched to gas) that
> > goes up and through the garage attic trusses (above the garageb s drywall
> > ceiling)
> > toward the houseb s laundry room.  My thought is to interrupt the run to
> the
> > dryer, terminating the run toward the no longer being used dryer, and
> install
> > a J-box to make a new run to the adjacent garage wall for the a/c unit.
> I
> > plan
> > to bore through the double top plate and run the Romex down through the
> wall
> > and through to the outside where it would be connected to the switch box.
> > Here are my questions:
> > 1.  Planning 2.5 ton 13SEER unit.  What Romex wiring size can I run?
> Itb s
> > about a
> > total of 50b .
>
> 30 amp breaker requires 10gauge wire, which will provide a 3% voltage
> drop at about 100 feet.
>
>
> > 2.  I understand that the J-box in the attic storage space must be easily
> > accessible.
> > Any other placement requirements?
> > 3.  Any recommendations for the outside switch box?  Is there a design
> for
> > going through a siding/OSB exterior wall?
>
> I expect they want a standard a/c disconnect, with fuses.  There are
> versions that feed through the back, from through the wall.
>
> > 4.  Any nailing recommendations?  Ib m familiar with not nailing
> (staples)
> > too
> > tight on the Romex.  Spacing suggestions?
>
> Minimum spacing is specified by the NEC.  basic rule is no more than
> 4.5 feet apart, within one foot of any box or fitting, and within 6
> inches of a single gang box without a clamp.  Also, wire should be
> parallel with the studs (where that makes sense, of course), and needs
> to be 1 1/4 away from the edge.  If it can't be, it has to be
> protected from nails by a plate, sleeve, or in conduit.  There are
> additional complications, but if you follow that, use sense, you'll be
> fine.
>
>
> --
> David Scheidt
> dmscheidt at gmail.com
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