Attic fan

[Robbie Atoms]

Is a attic fan considered an appliance or a motor in a
Dwelling calculation? I think it would be a motor calculation.
Thanks
Robbie

 

[jumper]

IMO it is an appliance with a motor.

It can be used for 220.53.

 

[MyCleveland]

IMO it is an appliance with a motor.

It can be used for 220.53.

Sure....as long as it's not a FURNACE motor.

 

[jumper]

Sure....as long as it's not a FURNACE motor.

Of course not.

The argument that mainly comes up is that the attic fan is part of air conditioning equipment.


220.53 Appliance Load — Dwelling Unit(s). It shall be permissible to apply a demand factor of 75 percent to the nameplate rating load of four or more appliances fastened in place, other than electric ranges, clothes dryers, space- heating equipment, or air-conditioning equipment, that are served by the same feeder or service in a one-family, two- family, or multifamily dwelling.

 

[MyCleveland]

Of course not.

The argument that mainly comes up is that the attic fan is part of air conditioning equipment.


220.53 Appliance Load — Dwelling Unit(s). It shall be permissible to apply a demand factor of 75 percent to the nameplate rating load of four or more appliances fastened in place, other than electric ranges, clothes dryers, space- heating equipment, or air-conditioning equipment, that are served by the same feeder or service in a one-family, two- family, or multifamily dwelling.

Sorry Jumper...when I saw the post I immediately recalled your defense of furnace motors a few weeks back and was just trying for a funny.
Swing and miss.

 

[jumper]

Sorry Jumper...when I saw the post I immediately recalled your defense of furnace motors a few weeks back and was just trying for a funny.
Swing and miss.

Prolly my fault, I prattle about in so many threads my brain forgets whatever nonsense I said yesterday most times.

 

[rlundsrud]

Perhaps this is off topic but do these require a disconnect switch at the fan? To the best of my knowledge, I've never seen one installed.

 

[jumper]

Perhaps this is off topic but do these require a disconnect switch at the fan? To the best of my knowledge, I've never seen one installed.

Which code cycle?

I only 2014 handy at the moment.

 

[jumper]

Perhaps this is off topic but do these require a disconnect switch at the fan? To the best of my knowledge, I've never seen one installed.

Depends on the size of the motor.

422.31 has some changes in the 2014.

1/8 HP or 300VA, no. Breaker is fine.

Larger, maybe. A few variables involved.

 

[kwired]

Of course not.

The argument that mainly comes up is that the attic fan is part of air conditioning equipment.


220.53 Appliance Load — Dwelling Unit(s). It shall be permissible to apply a demand factor of 75 percent to the nameplate rating load of four or more appliances fastened in place, other than electric ranges, clothes dryers, space- heating equipment, or air-conditioning equipment, that are served by the same feeder or service in a one-family, two- family, or multifamily dwelling.

IMO if it is not acting on the air of the occupied space it is not air conditioning equipment. Even then "Air conditioning equipment" to NEC typically contains a hermetic refrigerant compressor. See 440.1.

These are just ventilation appliances in nearly all instances.

By the nature of their intended operation I probably wouldn't apply a demand factor to them though. If you a large roof and four or more of them - they typically will run for more then three hours when they are called on to run.

Most are less then 300 VA or 1/8 hp. Should you forget to include them in the load calculation, they probably do not throw you off any significant amount.

 

[jumper]

IMO if it is not acting on the air of the occupied space it is not air conditioning equipment.
.

I agree, not part of AC.