can neutral wire always be shared ?

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  #1  
Old 06-11-07, 01:14 PM
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can neutral wire always be shared ?

If you have to high amp circuits...such as a window a/c and a bath room hot tub/whirlpool...each requiring a dedicated 15 amp circuit..can you still share the neutral for the circuit ?

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  #2  
Old 06-11-07, 01:18 PM
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Yes, provided that the two hot lines come from opposite sides of the incoming 240 volt service.
 
  #3  
Old 06-11-07, 01:57 PM
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There are a few other restrictions on shared neutral circuits too, such as pigtailing the neutral at each outlet and using a common trip lever if the two hots are ever both connected to the same yoke.

Note also that if you don't get the two hots on opposite legs of the service, everything will work perfectly fine ... until the fire. Don't do it unless you are 100% sure of the theory behind how this works.
 
  #4  
Old 06-11-07, 03:12 PM
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Neutrals may not be shared downstream of a single-pole AFCI or GFCI device which means no shared neutral circuits may serve bedroom lights or receptacles, and in many cases cannot serve bathroom or kitchen receptacles.

Your whirlpool tub requires GFCI protection, so if you use a shared neutral circuit you will need to use a blank-face GFCI disconnect instead of a GFCI breaker.

Usually a shared neutral circuit is not worth the trouble in residential wiring. I only recommend them where the circuit legs are going to the same physical location such as a dishwasher and disposal or an outdoor shed.
 
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