Says “secondary surge protector” does “secondary” mean it’s type 2? Thanks in advance!
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No!
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Those were originally installed as a Type 1 but these units preceeded the Type 1 or Type 2 classifications that are in the NEC today.
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I found this surge protector connected to the main lugs. Would you consider this a double tap, or would it be acceptable due to being grandfathered in?
It was never code compliant to double tap the terminals that are listed for only a single conductor.
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Did you read the full article at the link I posted above?
