2 wires connected by a plastic wire-nut.  I want to further secure them by a liquid glue all inside the nut, that will harden permanent.?

What glue/cement should I use?  These are big wires, measuring .213, insulation and all.

Joe2019-12-18T23:39:26Z

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Glue will reduce the quality of the electrical connection.

A wire nut, of the correct size for the wires, will make a connection that is mechanically and electrically sound, and hold the wires in compression.  It's hard to beat.

Anonymous2020-07-28T15:50:30Z

the option is solder, but no one does that but me 

if you staple the romex to the studs it will be secure if you nut it correctly 
what kind of stress do you worry about ?

Robert J2019-12-19T15:53:08Z

If you think there is any possibility of a wire nut coming loose, use a proper screw terminal junction box instead.

Or use crimped-on eyelet terminal tags, then a nut, bolt and anti-vibration washer to connect them together.
(Be sure to use a proper ratchet crimp tool in that case, not the nasty plier things that come with cheap terminal kits). 


Do that inside a plastic box such as this, replacing the small terminal block with a suitably large one or using it as a container for a bolted junction.
https://www.ebay.com/itm/3-Way-Electrical-Junction-Box-Enclosure-Case-Waterproof-IP68-Cable-Connector/114018673214


There is nothing you can safely add to a wire nut.

Ensure whatever you do complies with your local electrical regulations, if it's anything other than low voltage wiring.

Anonymous2019-12-19T03:08:45Z

Just leave it alone.  The wires are not going anywhere.

STEVEN F2019-12-19T02:15:45Z

Liquid glue will interfere with the conductive properties of the joint. If you have the proper sized wire nut, you DO NOT need any further mechanical reinforcement.

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