I do not know of any code that restricts a garage circuit to just the garage
Or one that requires a dedicated circuit for a garage door opener

 

Ok for starting this topic .,

Typical most resdentail half hp GDO useally draw about 5 to 7 amps.

However you may want to check with your local codes I know most area will required RCD { GFCI } to the GDO anyway but few still have extempt on it and most case I know the GDO is useally tied together with garage receptale circuit unless specficed in the instruction that it required delcaited circuit then you have to do that.

Merci,Marc

 

it would draw 750W max for 1 HP

These small motors are very inefficient; 1500w is more likely for 1 hp, but the NEC has a table in it for figuring worse case values.

 

but, should be plenty of amps left to power whole house fans right?
I just want to make sure the door opener doesn't have a surge characteristics that would trip a 20amp breaker

 

but, should be plenty of amps left to power whole house fans right?

Fans generally don't pull MUCH power. The worst ones I've encountered so far were the cheap motors for attic ventalators from big box stores, I'm seen specs that have indicated as much as 4 to 5 amps for those fans.

But a quick google on wattage for a whole house fan has numbers more in line with about 250 watts (that's about 2+ amps). Since your basement already has a 20 amp circuit, unless you've got other appliances (such as a dehumidifier) sounds like you've got plenty of power for a fan and door opener.

 

One more question, since it is a 20amp breakeer circuit I need to use 12 gauge romex wire, I cannot use 14 gauge right even if it is going to terminate at the hardwared fan?

 

Yes 20a must have 12g wire