Switch on HVAC GFCI

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augie47

augie47

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Tennessee
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State Electrical Inspector (Retired)
Friend of mine called asked when the Code starting requiring a switch on a rooftop GFCI. Says he has a new 3 phase RTU with a lockable DP toggle, nothing on the line side, load size feeding a built-in GFCI and nothing on the load side of the GFCI.
Any ideas ?
 
augie47 said:
Friend of mine called asked when the Code starting requiring a switch on a rooftop GFCI. Says he has a new 3 phase RTU with a lockable DP toggle, nothing on the line side, load size feeding a built-in GFCI and nothing on the load side of the GFCI.
Any ideas ?
Click to expand...

Gus sorry I don't understand this one. Are we looking at 210.63 or I must be confused.....:confused:
 
Greg, nor do I (understand)..nor does he.
I've never seen that arrangement. Monday we will contcat the mfg. I was just wondering if anybody in this diverse group had encountered such.
 
augie47 said:
Friend of mine called asked when the Code starting requiring a switch on a rooftop GFCI. Says he has a new 3 phase RTU with a lockable DP toggle, nothing on the line side, load size feeding a built-in GFCI and nothing on the load side of the GFCI.
Any ideas ?
Click to expand...
Huh?:-?
It sounds like:
3 phase RTU came with a mounted 2-pole disconnect.
2-pole disconnect does not have any line side connections
2-pole disconnect feeds a GFCI device
GFCI device has no load connections

My guess is that your friend needs to run a dedicated power circuit to the line side of the 2-pole disconnect. If the GFCI device is not a receptacle, then your friend needs to add one, on the load side.
 
sorry Jim, I must not have made it clear. The unit has a 3 pole breaker, factory installed, feeding all HVAC equipment...
in addition, it has a 2 pole toggle..no line connection,,,load to a GFCI
I've seen a lot of high-end units with a GFCI built in even a few with a transformer/GFCI, but this one has the GFCI and the switch... mgf. may shed some light Monday.
 
Humm

Humm

Most I have seen have a single pole switchi nside of the unit to kill power to the GFCI i....Seems every spring we are called to replace numerous GFCI in RTUs that have went bad...Quick and easy money...
 
When I see this with RTUs it is because there is a factory installed dedicated transformer running the factory installed GFCI receptacle.

The transformer takes the either the 480 V or 208 V supply and makes 120 VAC for the outlet.

All of this requires OCP for the line side of the transformer, due to the small size of the transformer the over current protection is often small fuses and depending of the fuse holders they choose the may need a disconnecting means ahead of them.
 
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