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4 wire main panel switched to sub panel

Jerry Lozier

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Remoldel on older home, switched previous main panel to sub panel off new main panel. Old 200 amp main (now just a disconnect) they ran #2 AL with a 70 amp breaker in new main panel.

QUESTION: any reason the old (now subpanel) should not have been rewired with neutrals floated as they are bonded like a main panel.

old panel

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#2 AL from new panel

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70 amp breaker in new panel to sub

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Grounds and neutrals bonded

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thanks guys

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