Is a loop required under a receptacle screw?

[SSDriver]

I agree, a loop is best practice. I see the Leviton online instructions say to make a 2/3 loop under the screw. However, does NEC or any code state that a loop under a screw is required?

I know NEC does not, but it does say you have to follow manufacturers instructions

 

[Another C10]

Back wire is the best of both worlds

Back wired or stab in is the best design for quick finish work but horrible for long term functionality, although I have to admit it's an easy money maker on correcting the ... "1/2 of my room doesn't work call" .

 

[Another C10]

does NEC or any code state that a loop under a screw is required

not to be a smart alec but we put way to much criteria on what is or is not written within the NEC ... I don't think the NEC tells us to wear gloves or what tool is best for the job either. point being sometimes our educated common sense will prevail, not meaning to bash your personal character , just using your noted comment as a talking point. Yes some techniques are better than others, we don't need a boardroom of NEC rule makers to come to that conclusion for us.

 

[tom baker]

FWIW we use crimp pins and coloured ferrules. Works for us.

We would except for the confusing metric wire sizes.

 

[Besoeker3]

We would except for the confusing metric wire sizes.

These are all controls, all 1.0mm, not a lot to be confused about..........................

 

[roger]

I agree, a loop is best practice. I see the Leviton online instructions say to make a 2/3 loop under the screw. However, does NEC or any code state that a loop under a screw is required?

110.3(B)

 

[retirede]

We would except for the confusing metric wire sizes.

 

[Delta_Dave]

110.3(B)

Ok. It's one of those 'install to manufacturer's instructions'. So an Inspector could fail an inspection if he saw it and knew.

 

[roger]

Correct and as I posted earlier, UL has instructions as well.

 

[Frank DuVal]

These are all controls, all 1.0mm, not a lot to be confused about..........................

Wait, let me use Google to see what size that is in an available ordering size from the supply house.

Oh No! 1.04 mm ² is 17 AWG, not happening here.

I use ferrules a lot in cabinets like that. Unless the devices have nice clamps, then I do not.

 

[electricmanscott]

110.12 Electrical equipment (and a receptacle is equipment) shall be installed in a neat and workmanlike manner.

Side note, that's been removed and replaced for 2023 to gender neutral language.

 

[Besoeker3]

Wait, let me use Google to see what size that is in an available ordering size from the supply house.

Oh No! 1.04 mm ² is 17 AWG, not happening here.

No - but the rest of the world does..................

 

[GeorgeB]

These are all controls, all 1.0mm, not a lot to be confused about..........................

I think he was joking with you. Much (if not most) of our industrial controls wiring uses ferrules. Our wall switches and typical 15 and 20 amp receptacles have 5 screws for our duplex outlets; 2 hot, 2 neutral, 1 for that bare, green, or yellow-green. Only the green and neutral are seen in this view.

Why 5 you ask? The brass tab between the silver screws showing can be broken to separate the 2 receptacles on the 1 yoke.

 

[tthh]

Had a look at the wiring on a Hatteras yacht -- probably in the 1990's. The wiring was all stranded and all the terminations were crimped on connectors and light switches used were just normal Leviton.

 

[Another C10]

No - but the rest of the world does..................

well that doesn't impress me much, I like the numeric system I know, it's worked well within our construction industry and so far structures still stand tall and strong. I'm better at fractions I suppose.

 

[Besoeker3]

well that doesn't impress me much, I like the numeric system I know, it's worked well within our construction industry and so far structures still stand tall and strong. I'm better at fractions I suppose.

And that's fine. But you don't fractions with currency like dollars or pounds.

 

[Besoeker3]

I think he was joking with you. Much (if not most) of our industrial controls wiring uses ferrules. Our wall switches and typical 15 and 20 amp receptacles have 5 screws for our duplex outlets; 2 hot, 2 neutral, 1 for that bare, green, or yellow-green. Only the green and neutral are seen in this view.

Why 5 you ask? The brass tab between the silver screws showing can be broken to separate the 2 receptacles on the 1 yoke.


View attachment 2563760

This what we have on our walls, usually a double.