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I am upgrading an obsolete Sylvania panel located inside the house. There's a main panel outside the garage with the main 150 amp breaker. I have a supplied bonding screw with the new panel. Technically the indoor panel is a sub panel, so I am thinking I shouldn't install the bonding screw. Am I right in my assumption?

The house was built in 1986. The house is located in Florida, USA. What should I look for to know, should I check for 4 wires from outside feed to the inside and see if outside box is bonded neutral to ground?

isherwood
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Ken
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1 Answers1

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You are correct--the panel should not be bonded. Most panels will come with a bonding screw in case it is being used as a main panel and first means of disconnect, which yours isn't. When you install your sub panel, all neutrals from circuits in the panel need to be attached to the neutral bus and a second grounding bus needs to be installed in the sub panel and all bare and green grounding conductors must be install on that bus.

Also the neutral conductor coming from the main panel needs to be attached to the sub panel neutral bus and the grounding conductor coming from the main needs to be attached to the new grounding bus. Most panels do not come with a separate grounding bus but can be purchased separately. They are usually available at the same location you purchased the sub panel.

Hope this helps and stay safe.

isherwood
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Retired Master Electrician
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