Connecting conductors to receptacles

[Kooch]

I am getting old! (been a master since 1987 but mostly retired since 2004) I've been teaching high school students a basic practical electricity class. About half the semester is focused on the NEC and the other will be on replacing devices, adding a receptacle, hanging fixtures, etc. Just enough to see if there is interest in pursuing a career in the electrical field and possibly establishing an actual curriculum at this particular school.
To the point... I have looked for hours and can't seem to find the code reference for hooking the wires clockwise around the screw terminals. I don't think the Code actually says that but I recall that it does say something about it. Any help for an old-timer?

 

[roger]

At one time the handbook had an illustration showing what you're asking about in 110.14

 

[Little Bill]

At one time the handbook had an illustration showing what you're asking about in 110.14

My handbook shows it, but no code reference for it.

IMO, with solid wire, it doesn't make much difference.
Although, I always wrap the solid conductor clockwise. With stranded, if you wrap it counter clockwise, it will cause the strands to squeeze out when tightening the screw.

 

[mikeames]

Yea this is from my 99 Handbook

 

[electrofelon]

Do manufacturers instructions state to wrap clockwise? If so it would be 110.3

 

[mikeames]

I never checked, so I did, result.

On levitons site. The instructions are as follows. So yes you have to go clockwise at least with leviton. UL 498 : File E13399

https://leviton.com/content/dam/leviton/residential/product_documents/instruction_sheet/5320%20English%20Instructions.PNG

5320-4W

<p>White - 15 Amp, 125 Volt, NEMA 5-15R, 2P, 3W, Without Ears Duplex Receptacle, Straight Blade, Residential Grade, Grounding, All Screws Backed Out, Quickwire Push-In & Side Wired, Steel Strap</p>

leviton.com

 

[infinity]

Yea this is from my 99 Handbook

I was thinking about that NECH graphic too so I looked it up in my 2011. It seems that they're referring to only aluminum conductors not copper.

 

[mtnelect]

In the NEC 2011 Handbook you have "Mandatory Code" text in black and "Commentary" in overprinted with a color tint. Exhibits' 110.3 is the correct way & 110.4 is the incorrect method of terminating wire-binding screw terminals at receptacles and snap switches. Courtesy of Underwriters Laboratories.

 

[hillbilly1]

Anybody notice lately Leviton screws tend to push solid out from under them? I now have to keep the loop tight with my T-strippers. #14 and more so #12.

 

[mikeames]

Anybody notice lately Leviton screws tend to push solid out from under them? I now have to keep the loop tight with my T-strippers. #14 and more so #12.

A little, I thought it was me getting older (probably is) so I focus a bit more on the hook bend.