It doesn't say you can either. In fact it makes no mention of using
the screws as terminals at all.
This is summed up well in the beginning of NFPA70 (the NEC)
"90.1(C) Intention. This Code is not intended as a design
specification or an instruction manual for untrained persons."
On 07/22/2016 6:47 PM, firstname.lastname@example.org wrote:
In that case, why are they there? Decoration? It does say what wire
sizes they're qualified for and that they match UL color code and
proudly announces the "Terminal compartments isolated from each
other for positive conductor containment" and spec's they're Tri-drive
screws which pretty much indicates they're expected to be used.
Granted, but the manufacturer's datasheet isn't the Code, either...
The screws are there to tighten the plate inside the device.
There are 2 mounting screws there too and they are grounded but that
des not mean you can hook a ground wire to them.
Tri Drive simply means they accept flat blade and Phillips
screwdrivers along with #1 Robertson bits
Yes it is "110.3(B) Installation and Use. Listed or labeled equipment
shall be installed and used in accordance with any instructions
included in the listing or labeling."
You still have not told me what sized box you would need to accept 4
cables. (the minimum you would need to use 3 on one terminal, even if
you split the receptacle by breaking off the tab).
If you leave it as a duplex, you can install 8 conductors plus the
ground just using the available holes in the back. That is a count of
11 (22" for #14, 24.75" for #12)
Hey I really do not care. Do whatever you want. You are not in my
patch. Maybe your inspector doesn't care. I was just pointing out the
On 07/23/2016 1:19 AM, email@example.com wrote:
Ah, so! My bad; was thinking of the other push-in type with just the
internal spring connector in which the screw terminals are independent.
Just a "senior moment", I guess, sorry...
Referencing the Code doesn't make the referencing document the Code... :)
Yes, you're (obviously) supposed to install the device to Code, the
question I had (as well as at least one other poster) was where the
specifics of what had/had not been qualified was documented. But, as
above, that was based on thinking about another device's configuration,
not the specific device in question.
As for box sizes, I really don't know (and didn't go look up...just
seemed like there'd be room for a third cable if one didn't need to have
room for the pigtails -- but fill is something I'm certain I violate
routinely as Code just seems _way_ overkill often from a practical
standpoint of what one needs to put where. "If it fits, it's good" is
pretty much my definition... :)
The farm here isn't in a regulated jurisdiction so don't actually have
to worry about inspections...I've pretty much followed Dad's practices
which have served since REA arrived with no problems ever observed of
excessive heating or such in some 70 year or so now, so doesn't seem to
have been _too_ non-conservative.
I just redid some wiring in the barn where I've begun rearranging for
the woodshop installing a 3ph converter for the planer and removing a
bunch of the old motor starters and so on from the feed mill no longer
using to put its controls where they were. They were all installed in
the late 50s/early 60s and still look as new as far as wire, etc.,
inside the controllers, etc, despite the accumulated grain dust and
other inevitable detritus from such a location over that time...from
which I draw comfort the basic rules followed are adequate albeit
admittedly far closer to 60s/70s era Code than current; it's still
3-wire service, not 4, etc., and that's not going to change in my lifetime.
Again, I wasn't trying to argue, was actually trying to figure out a
limitation reason on using the side terminal screws but as noted was
operating under a wrong assumption which made the conclusion had drawn
Not sure I'm understanding the whole question here.
These receptacles have 2 screws on each side, joined by a jumper plate
that is removeable (one time only) to convert to a
split" There are 2 holes in the back of the receptacle at each screw
for "back-clamp" wiring that can accept one copper conductor from #10
to #14 AWG.
Those back-clamp conductors are clamped in place by pulling the
clamping plate in, squeazing the wire between the clamping playe and
the statiobary plate in the outlet.
Instead of arguing about whether it is legal to ALSO side-wire to the
screw terminals directly just look at the way it is constructed. Code
does NOT allow 2 wires under one screw BECAUSE the connection of each
wire is dependent on the integrety of the other When one wire deforms
from round over time it effects the pressure on the other wire,
effectively loosening the connection. The back-clamp system is
designed and approved for 2 wires on one screw using the clamp plate.
Addind a wire under the screw head (if it is physivally possible to do
so) changes the "engineering" of the connection, in basically yhe
same wat 2 wires inder one screw affects the connection and is NOT
allowed. I do not have the instructions that came with my outlet any
more but I recall it said for use with the convenient back clamo which
accomosates 2 wires per connection OR the "conventional" connection od
a single wire under the screw.
I'm sure on mine if I had installed 2 #10 conductors in the back it
wouls have been virtually impossible to get anything heavier than
aboue a #18 under the screw head
On Fri, 22 Jul 2016 14:27:25 -0700 (PDT), bob_villain
The thing people keep missing is you can accommodate four 2 wire w/g
cables in a standard back wired duplex receptacle without using the
side screws. How many wires do you think you can stuff in a box?
I have vague recollection that a device wasn't allowed in-circuit
with another device - e.g. a downstream recep may not be wired
in parallel with an upstream recep using the device terminals, but
rather the upstream device must be pigtailed.
On Wednesday, July 20, 2016 at 5:02:28 PM UTC-5, firstname.lastname@example.org wrote:
You don't explain where this wire is coming from or how long it
is. It should come from a 15a or 20a breaker on the main panel.
Black is hot. White is neutral. Green is earth ground. That is
the standard color code but you can't trust that is true until
you verify it. A 10 gauge wire at 120V should go through a 15a or
20a breaker. If the wire is long then a 15a breaker may be best.
The black (Hot) wire goes to the breaker. The box may accept two
breakers but you can only use one breaker. Turn off the power
before messing with it. Contact an electrician if you are uncertain.
Use a test light to verify that black is indeed the only hot wire.
Since it is not going to be 100% to code anyway, there IS a way to
use both breakers in that panel. Using a lug or large wire nut, split
the black to both breakers, and put the white on the neutral as you
normally would. Make sure the #10 wire is fed on the black from a
single 30 amp breaker, with the white on neutral at the main panel so
you are only getting 120 volts, not 240.. Connect the bare or green to
the panel case.
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