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Posted by N8N on April 22, 2008, 3:41 pm
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> > On Apr 22, 1:12=A0pm, rajmada...@gmail.com wrote:
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> > > I'm in the process of replacing an existing Vent/Heat/Light unit in my=
> > > bathroom. =A0The old wiring setup on this system seems odd to me.
>
> > > The previous installer is running three Romex wires to the unit.
> > > There is a two gang switch controlling (with one double switch).
> > > =A0 =A0 =A0 =A0 One wire holds the Neutral and ground (other wire is c=
lipped), coming
> > > from source junction box.
> > > =A0 =A0 =A0 =A0 Another wire is holding two feeds from the switch (the=
ground is
> > > clipped).
> > > =A0 =A0 =A0 =A0 The last wire is holding one feed from the switch (the=
other wires
> > > are clipped).
>
> > > Here is my question:
> > > =A0 =A0 =A0 =A0 Due to new location of the new unit, and existing cabl=
e size, I need
> > > to extend the two feed Romex cables coming from the switch. =A0Hence, =
I
> > > need a junction box to extend the lines. =A0The issue is, if I use a
> > > metal box then shouldn=92t those wires be grounded to the box?
> > > Normally, I would say yes ground the wires to the box. =A0However, the=
> > > previous installer cut the grounds on those cables=85 so what value
> > > would there be in grounding them? =A0Another solution is to use a
> > > plastic junction box (which is legal in my town), to avoid the
> > > grounding issue.
>
> > > Any thoughts?
>
> > > Thanks,
> > > Raj
>
> > The whole thing is incorrect, you should be running one cable from the
> > switch box to the unit. =A0Since that is not possible given that you
> > have three different functions in the unit (unless someone makes a
> > 12/4wg cable?) that is, vent, heat, and light, do any of these
> > functions have their own neutral? =A0If that is the case then you should=
> > run a separate cable for the light, say, as a 12/2 w/ground, and then
> > another cable 12/3 w/ground for the vent and heat. =A0Neutrals should be=
> > connected to each other at the switch box but NOT in the v/h/l unit.
> > this way the currents in each cable will sum to zero in the absence of
> > a ground fault. =A0All grounds should be connected together and to the
> > box at all locations.
>
> > You will have to run new wire from the switch box to the new location
> > to be code compliant.
>
> > good luck
>
> > nate- Hide quoted text -
>
> > - Show quoted text -
>
> What N8N describes is essentially what I did, except that there are 2
> additional lights in the bathroom.
>
> There are 3 switches on the wall - one vertical, the other 2
> horizontal.
>
> The vertical switch is wired to control the light in the heat/vent
> unit as well as the 2 other recessed lights via 14/2wg romex. (The
> lights are on the load side of the GFCI outlet since one recessed
> fixture is above the shower stall.)
>
> The horizontal switches control the heat or vent via 14/3wg.
>
> The top horizontal switch controls the vent, because the vent pulls
> air up, the lower horizontal switch controls the heat because the heat
> blows down.
>
> Anal? Did I hear someone say anal?- Hide quoted text -
>
> - Show quoted text -
I mentioned 12/2 and 12/3 because I was assuming a dedicated 20A
circuit for the bathroom.
yes, I'm still planning exactly how I'm going to rewire mine.
nate
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