Why is this screw there?

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IMG_6199
IMG_61991920×1440 239 KB

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Is it a back-fed breaker which I assume it is? A screw or hold-down clamp is required to secure a back-fed breaker for safety reasons. Do you have a picture with the dead front cover removed and/or the circuit labels?

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I do not, sorry. I rent and didn’t want to do anything of the sorts for the educational portion. Thank you for your answer and helping me learn more!!

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That is the main breaker (backfed) of a 100 A panel turning off the entire dwelling. It is required to be secured by a screw.

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The safety reason is that if the back-fed breaker were to accidentally detach while someone was working inside the panel, the “live” back-fed breaker would be flopping around inside the panel.

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Afternoon, Alexander. Hope to find you well.

Looks like a hold-down kit for a back-feed breaker.

back-feed breaker hold down kit
back-feed breaker hold down kit579×463 13.7 KB

Can you describe a bit more of what you inspected in relationship to this panel?
Is this a service, sub or auxiliary panel?

Is/was there solar or a power generator?

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