grounding with #10 stranded

[ibew441dc]

infinity,


Hmmm? you got me think'n. It has always been stuck in my head that ground screws must be listed.

Please read 250.148 , especially 250.148(c) and tell me what you think.

ibew441dc

 

[roger]

It means that if an approved screw (not listed as there is no such animal that I know of) is not used a listed device (such as a clip) must be used.

Roger

 

[tom baker]

I find these to be quite useful.

An easier and cheaper solution is a non insulated fork terminal. The insulated ones are hard to crimp without a good tool. I make up a bunch of 12 AWG pigtails with the crimp on terminals

 

[peter d]

The best solution is to use solid wire pigtails for grounding.

 

[ibew441dc]

roger

Define grounding screw. I see no spot that says it has to be approved.

Also check out 250.8 , that should clear it up.

What do ya think?:smile:

 

[roger]

roger

Define grounding screw. I see no spot that says it has to be approved.

Also check out 250.8 , that should clear it up.

What do ya think?:smile:

I know what the article says, maybe this will help you.

The termination of equipment grounding and bonding conductors must be by exothermic welding, listed pressure connectors of the set screw or compression type, listed clamps, or other listed fittings. Sheet-metal screws cannot be used to connect grounding (earthing) or bonding conductors or connection devices to enclosures. Figure 250–42

Author’s Comment: The rule still doesn’t prohibit drywall screws or wood screws from being used for this purpose, just “sheet-metal” screws!

​

Roger

​

 

[tbonse]

I know what the article says, maybe this will help you.

The termination of equipment grounding and bonding conductors must be by exothermic welding, listed pressure connectors of the set screw or compression type, listed clamps, or other listed fittings. Sheet-metal screws cannot be used to connect grounding (earthing) or bonding conductors or connection devices to enclosures. Figure 250?42

Author?s Comment: The rule still doesn?t prohibit drywall screws or wood screws from being used for this purpose, just ?sheet-metal? screws!

​

Roger

​

Yes, It may not specifically prohibit drywall or wood screws, but as they're not UL listed for electrical bonding, they're also not permitted. :grin:

Back on topic, my personal preference, for #10, #8, or #6 stranded grounding conductors, is the set screw pressure connector.

 

[roger]

Yes, It may not specifically prohibit drywall or wood screws, but as they're not UL listed for electrical bonding, they're also not permitted. :grin:

What screw do you know of that is UL listed for electrical bonding?

BTW, for clarrification, the commentary with the illustration is not mine.

Roger