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Secure Circuit Breaker Screws (Manual Torque)

0:35
1:55
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At 0:35 in

My Dad who is a Master Electrician shows how to Install a Commercial 3-Phase Breaker, Thoughts?

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What happens here

This is a critical step for both safety and proper function. Using a No. 2 Square Tip screwdriver, manually tighten the captive screws on the circuit breaker. It is extremely important NOT to use a drill or power tool for this, as the internal components, made of aluminum and copper, are very soft and easily stripped. Carefully turn each screw until you feel it 'bite' into the threads, indicating a snug connection. The screws should be completely flat against the breaker once tightened. Throughout this process, maintain a 'one-hand' technique, keeping one hand free and away from the electrical panel. This prevents creating a path for electrical current through your body in case of an accidental contact.

Goal: Secure the circuit breaker to the busbar using the captive screws with manual torque to prevent damage.

Tools and materials

  • Electrical Panel Unspecified — The main distribution board where the breaker is installed
  • Insulated Gloves Helix — To provide electrical insulation and hand protection during handling
  • No. 2 Square Tip Screwdriver Unspecified — Manually tightening the captive screws on the circuit breaker

What they say

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till it snaps in. Now, this is what a lot of rookies do. They use a drill. You do not use a drill unless you are a journeyman. Okay. Why is that? Because these are aluminum and copper, very light, easily stripped metals. Okay. So, they're so easy to cross thread. I can't tell you how many times in my career I show up and one of these screws is cocked or burned because it wasn't put in properly. Yeah. So, you can eliminate all that headache by just using number two square tip screwdriver. Okay. One hand, I've got an insulated glove on. One hand and I'm going to put the screw in and I want to turn it till I feel it bite into the thread. One hand now. Yeah, cuz you don't want to uh well, create a loop, right? Always go one hand. If I go like this, now I create a path through my body. Now that I've got it in, now I'm going to I'm going to manually torque it by hand. Nice. So, you can see every screw is completely flat. It's touching perfectly the bus. That's a great connection. And now I can turn it on and off. Of course, I'm going to leave it off and now I'm ready to put the wire in. Nice. Yep, I see the MC cable. Nice.

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