Switched from hand twisting to a torque wrench for main lugs after a scary call

I used to just crank down on main lugs by feel, thinking a good grunt was enough. Then I got called to a house in Bellingham where a 200 amp panel had melted lugs from being too tight. The homeowner said they heard a buzzing for a week. I bought a basic torque wrench for about 80 bucks and started using the specs on the panel label. The difference in how the connections seat is real. What's your go-to method for making sure lugs are right?

3 comments

3 Comments

kevinr232mo ago

You really trust those torque specs that much? I've been doing this for twenty years and my calibrated arm has never caused a meltdown. Isn't that extra step just slowing you down on simple jobs for no real gain?

willow_garcia2mo ago

Yeah but that's the thing... your arm isn't calibrated, that's the whole point. I've seen too many connections fail both ways, from loose to over-tightened. The specs are there because the engineers who made the panel actually tested it. It feels like an extra step until you're the one getting that callback for a melted busbar.

the_sean1mo ago

Ever think your arm could be wrong? I used to side with kevinr23 on this, thought my feel was good enough. Then I saw a service cable burn up from a lug that was just a bit too tight. The torque wrench feels slow at first, but it's faster than redoing a job or dealing with a fire. That cheap tool saved me from a huge headache. Now I check the label every time, no guesswork.

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