HVAC disco

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Re: HVAC disco

The EGC would need to remain continuous due to the capacitor holding a charge for LRC.


EDIT: Or would you be referring to the Tstat bringing voltage into the cabinet when it closes?

[ January 30, 2006, 11:00 PM: Message edited by: throttlebody ]
 
Re: HVAC disco

250.124(B)Switches. No automatic cutout or switch shall be placed in the equipment grounding conductor of a premises wiring system unless the opening of the cutout or switch disconnects all sources of energy. I would be more worried about why someone would buy a 3 pole disconnect when the can buy a 60 Amp, 2 pole for about $10 with a ground lug. I may be wrong but that looks like a 30 Amp disconnect and from the size of the wire it may be too small for the load.
 
Re: HVAC disco

Another one....LOL :D

The compressor not being insulated from the frame while the EGC is in the open position.


Anything other than what pertains to the box is just assumption.
 
Re: HVAC disco

When the switch is disconnected, the EGC is also disconnected, if somehow voltage is still present at the unit, there is no fault path available.
 
Re: HVAC disco

Originally posted by redfish:
When the switch is disconnected, the EGC is also disconnected, if somehow voltage is still present at the unit, there is no fault path available.
Click to expand...
When I unplug any appliance and somehow voltage is still present at the unit, there is no fault path available.
 
Re: HVAC disco

Originally posted by websparky:
Clue #2:

Without giving you the code reference for EGC's and switches.....
The a/c units like this one have more than one source of energy.
Click to expand...
Those other sources would also be grounded no?
 
Re: HVAC disco

When I unplug any appliance and somehow voltage is still present at the unit, there is no fault path available.
Click to expand...
True, however I am going by this post:
Clue #2:Without giving you the code reference for EGC's and switches.....
The a/c units like this one have more than one source of energy.
Click to expand...
which indicates that voltage WILL be present, perhaps only control (low) voltage, but voltage none the less.
 
Re: HVAC disco

Originally posted by iwire:
Originally posted by websparky:
Clue #2:

Without giving you the code reference for EGC's and switches.....
The a/c units like this one have more than one source of energy.
Click to expand...
Those other sources would also be grounded no?
Click to expand...
Possibly, and most likely 24 volts. These days, the lov-voltage control circuit is grounded, which means there is a redundant, albeit small, parallel grounding path\ between the inside and outside units.
 
Re: HVAC disco

Wow, what a thread, so informative, and what a nice picture to start it all out. What was the point again? :confused:
 
Re: HVAC disco

dave, all of the above mentioned code violations not withstanding, the blades appears to be "welded" in the on position. If so, there is probably an interesting story. Care to elaborate?
 
Re: HVAC disco

LOL! Another one:

The looseleaf combustible material behind the poles.

Probably the mfr disconnect labels. :D

[ February 02, 2006, 09:43 PM: Message edited by: throttlebody ]
 
Re: HVAC disco

The switch is right side up.

The switch is open (off)

I do not see any welding, I see the grease they put on the blades.
 
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