gfci for rootop units?

[steveng]

what type of gfci device are available for 480 v 3ph roof units hvac?

what is the cost?

thanks,
steve

 

[charlie]

what type of GFCI device are available for 480 v 3ph roof units HVAC?

Sorry Steve, I don't understand. The only GFCI devices I know of are 120 and 240 volts for the required receptacles for the maintenance of the HVAC units. Those GFCI units are not very expensive and are very common. :smile:

 

[Buck Parrish]

Ditto, that

 

[quogueelectric]

Threes a charm.???

 

[iwire]

what type of gfci device are available for 480 v 3ph roof units hvac?

what is the cost?

thanks,
steve

Not sure what you asking about.

I know that many roof top units can be ordered to arrive on site with a factory installed GFCI receptacle that is powered from the line side of the factory installed disconnect. The 125 volt 15 amp GFCI will be powered from it's own transformer.

I love it when the units are specified that way, I don't have to bring up a separate 125 volt 20 amp circuit. I don't know the cost.

You could also specify that the EC provide a small transformer to power the receptacle of course this has to be tapped from the line side of the 480 disconnecting means and proper overcurrent protection must be provided.

 

[jimday]

what type of gfci device are available for 480 v 3ph roof units hvac?

what is the cost?

thanks,
steve

Why GFCI for roof top HVAC units? If you are trying to protect an upstream panel or feeder breaker from tripping I would recommend a GFI feeder breaker for the HVAC unit or a GFI relay/protector at the device. Other than that I'm not sure why you would want it.......

 

[chris kennedy]

Why GFCI for roof top HVAC units? If you are trying to protect an upstream panel or feeder breaker from tripping I would recommend a GFI feeder breaker for the HVAC unit or a GFI relay/protector at the device. Other than that I'm not sure why you would want it.......

Its a rec so the HVAC guy doesn't rig up something off the disco for power tools and such.

210.63 Heating, Air-Conditioning, and Refrigeration Equipment Outlet.
A 125-volt, single-phase, 15- or 20-ampere-rated receptacle outlet shall be installed at an accessible location for the servicing of heating, air-conditioning, and refrigeration equipment. The receptacle shall be located on the same level and within 7.5 m (25 ft) of the heating, air-conditioning, and refrigeration equipment. The receptacle outlet shall not be connected to the load side of the equipment disconnecting means.
Exception: A receptacle outlet shall not be required at one- and two-family dwellings for the service of evaporative coolers.
FPN: See 210.8 for ground-fault circuit-interrupter requirements.

 

[jimday]

Its a rec so the HVAC guy doesn't rig up something off the disco for power tools and such.

I get that there needs to be a GFCI WP maint recept for equipment, but that does not appear to be what was being asked, eh?........

 

[chris kennedy]

I get that there needs to be a GFCI WP maint recept for equipment, but that does not appear to be what was being asked, eh?........

I see, OP is looking for protection of a 480 3? RTU. Thats a new one on me. I think OP was asking about the rec.

what type of gfci device are available for 480 v 3ph roof units hvac?

Ground-Fault Circuit Interrupter (GFCI). A device intended for the protection of personnel that functions to de-energize a circuit or portion thereof within an established period of time when a current to ground exceeds the values established for a Class A device.
FPN: Class A ground-fault circuit interrupters trip when the current to ground is 6 mA or higher and do not trip when the current to ground is less than 4 mA. For further information, see UL 943, Standard for Ground-Fault Circuit Interrupters.

You thinking GFP?

Ground-Fault Protection of Equipment. A system intended to provide protection of equipment from damaging line-to-ground fault currents by operating to cause a disconnecting means to open all ungrounded conductors of the faulted circuit. This protection is provided at current levels less than those required to protect conductors from damage through the operation of a supply circuit overcurrent device.

 

[steveng]

I see, OP is looking for protection of a 480 3? RTU. Thats a new one on me. I think OP was asking about the rec.




You thinking GFP?

thanks, for clearing that up, man, you guys know your stuff,

i forgot all about that receptacle circuit, i did not include that when i specd this job, thanks for setting me straight on that!