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fused disconnect and/or GFCI ?

4K views 8 replies 6 participants last post by  RichyL 
#1 ·
I am installing a hard-wired/plumbed residential steam humidifier which requires 240v (no neutral) and is rated at 17.8 Amps. The manual calls for "an external fused disconnect" rated at 25 amps but does not mention a GFCI breaker. It seems like a gfci would make sense in this case, and may be required by NEC (but not sure how a humidifier gets classified by NEC).

My question is how "best" (compliant with NEC and safest way) to do this ---

a) install 30 amp GFCI breaker in main panel (SquareD QO panel -- no 25amp breakers available) and a 25 amp fused disconnect at the unit. (or can I use non-fused disconnect since using GFCI at main panel?)

b) install 30 amp breaker in main panel and a 30 amp GFCI breaker/disconnect at the unit (25 amp if i can find one)

c) install 30 amp breaker in main panel and 25 amp fused disconnect at the unit, and skip the GFCI...


Thanks!!
 
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