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-   -   Panel Lug Nuts and Torque (https://www.diychatroom.com/f18/panel-lug-nuts-torque-656977/)

seephor 04-08-2019 10:51 PM

Panel Lug Nuts and Torque
 
I'm trying to get the torque right on some power/neutral/ground lugs because I'm a nerd. They are the flathead type and the nut in the lugs are close to 3/4" in diameter and the spec states 50 in-lb of torque. I put my regular flathead bit in my in-lb torque wrench and the head of the bit wasn't large enough so it stripped out the lug nut a bit since they are made of soft aluminum.

Can an electrician tell me if they sell special bits for these large lug nuts and how they go about torquing them to spec? Or am I just a square for trying to torque these down to spec?

chandler48 04-09-2019 05:03 AM

Re: Panel Lug Nuts and Torque
 
Where are these screws located? On breakers? In the panel? Do you have a picture you can share so we can see what you see?

Jim Port 04-09-2019 10:31 PM

Most of the larger connections are Allen screws to avoid being stripped.

The code calls for properly torquing connections including device screws.

HandyAndyInNC 04-10-2019 12:30 PM

Re: Panel Lug Nuts and Torque
 
I tighten all the lugs I have ever touched as tight as they will turn and then stop. That is more than enough to help the properly sized cable in the lug. Tighten the screw until it stops turning


Andrew
Handy Andy In Mt Airy NC

DanS26 04-10-2019 12:41 PM

Re: Panel Lug Nuts and Torque
 
Quote:

Originally Posted by HandyAndyInNC (Post 5811153)
I tighten all the lugs I have ever touched as tight as they will turn and then stop. That is more than enough to help the properly sized cable in the lug. Tighten the screw until it stops turning


Andrew
Handy Andy In Mt Airy NC

Andy.....you might want to read this.....

https://www.ecmweb.com/contractor/do...calibrated-arm

Oso954 04-10-2019 12:46 PM

Re: Panel Lug Nuts and Torque
 
Quote:

I tighten all the lugs I have ever touched as tight as they will turn and then stop. That is more than enough to help the properly sized cable in the lug. Tighten the screw until it stops turning
Thatís severe over-tightening when they are specíd at 50 inch lbs. (4.17 ft lbs)

HandyAndyInNC 04-10-2019 01:57 PM

Re: Panel Lug Nuts and Torque
 
It may be, but they are still tight to this day. I am referring to buildings I wired some 40 years ago.


Andrew
Handy Andy In Mt Airy NC

Jim Port 04-10-2019 08:29 PM

Quote:

Originally Posted by HandyAndyInNC (Post 5811153)
I tighten all the lugs I have ever touched as tight as they will turn and then stop. That is more than enough to help the properly sized cable in the lug. Tighten the screw until it stops turning


Andrew
Handy Andy In Mt Airy NC

A total hack method. I guess you have never seen the damage caused from overheated connections from being too tight or conductors flattened or cut from improper torque like you advocate.

seephor 04-11-2019 04:07 PM

Re: Panel Lug Nuts and Torque
 
The hex or allen type ones are easy since I can use my hex key sockets with my torque wrench but these regular flat head ones that are 1/2"+ in diameter are the ones I can't find any socket type of flathead fits that have a wide enough flat head to prevent it from stripping out. I figured someone must sell some 1/2" wide flat head socket bits but I can't come across any. I used a regular 1/4" drive impact bit but the head is not wide enough so it strips out the soft AL. I ended up just use a large screwdriver and torqued it by feel but I'd rather proper torque it with my torque wrench..

curiousB 04-11-2019 08:57 PM

Re: Panel Lug Nuts and Torque
 
1 Attachment(s)
Get one of these and a torque wrench.....

Fishbulb28 04-11-2019 10:37 PM

Re: Panel Lug Nuts and Torque
 
Quote:

Originally Posted by seephor (Post 5811957)
I figured someone must sell some 1/2" wide flat head socket bits but I can't come across any.

What you're looking for is called a drag link socket.

The only retail stores I've seen them in were Sears stores with a full tool selection. I'm not sure if any Sears still in existence stocks much in the way of oddball tools, none of the last ones around here did. So it's probably going to be found at a specialty tool shop or ordered online.

seephor 04-11-2019 11:43 PM

Quote:

Originally Posted by Fishbulb28 (Post 5812123)
Quote:

Originally Posted by seephor (Post 5811957)
I figured someone must sell some 1/2" wide flat head socket bits but I can't come across any.

What you're looking for is called a drag link socket.

The only retail stores I've seen them in were Sears stores with a full tool selection. I'm not sure if any Sears still in existence stocks much in the way of oddball tools, none of the last ones around here did. So it's probably going to be found at a specialty tool shop or ordered online.

Perfect. I would have never guessed “drag link socket” This is exactly what I’m looking for. I’ll order online. Thanks!


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