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[MAC702]

A 5/16" molly toggle will need about a 7/8" hole. With some Loc-Tite, I'd probably trust it if it snugged well.

A T-anchor would be a lot stronger with a full-size nut, and only need a hole the same size as the fastener: https://www.grainger.com/product/15W098?ef_id=CjwKCAj...

[MAC702]

Changing from MIG to flux-cored requires swapping the lead plugs to change polarity in addition to the dial setting on the machine....

[MAC702]

Does the hole have enough thickness to thread it? Or is that still too much modification? Drill and tap smaller holes? Any way to attach a picture of what you are seeing to help us think about it?

[MAC702]

Tell us all of your settings, including polarity.

[MAC702]

To what input voltage are you plugged in?

[MAC702]

I'm an electrician and I don't know what you mean by this. What exactly are you measuring at "10mm"? What is the duty cycle of the job being done by the 14-ga wire? How many amps is it expected to carry during that duty cycle?

Actually, China produces crap in some factories and...

[MAC702]

Because no one cares if air is leaking out of couplers while in use....

[MAC702]

The "rating" depends on the governing body and the circumstances. The manufacturer is not limited to the extra safety measures in the typical electrical construction codes. And separately, welding equipment (plasma cutters are often the same in this regard) has a duty cycle that allows for...

[MAC702]

Not keeping us updated regularly will result in immediate [email protected]

[MAC702]

If I'm picturing what you are describing, you have two "100" levers on a 2-pole breaker that are connected together? That means you have 100A of 240V available at that breaker. When you have just one lever on a single-pole breaker, it's that amount of 120V. This will usually be limited...

[MAC702]

No, it doesn't work that way. You need an electrician....