- Location
- Massachusetts
Re: HVAC disco
Originally posted by redfish:
What was the point again?
HVAC disco
- Thread starter websparky
- Start date
- Status
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
Re: HVAC disco
This is an outdoor enclosure, the cover swings up, that is why it is not visible.
The gunk on the blades is normal (well at least for Square D). They even sell this stuff as a repair part.
The switch is "on" in the down position, because it looks like the blade carrier is broken. It appears that each blade is making a deifferent amount of contact. This is why Lock Out/Tag Out requires a voltage test as well as a visual test to determine de-energized equipment.
This is an outdoor enclosure, the cover swings up, that is why it is not visible.
The gunk on the blades is normal (well at least for Square D). They even sell this stuff as a repair part.
The switch is "on" in the down position, because it looks like the blade carrier is broken. It appears that each blade is making a deifferent amount of contact. This is why Lock Out/Tag Out requires a voltage test as well as a visual test to determine de-energized equipment.
- Location
- Massachusetts
Re: HVAC disco
Jim, I disagree all the blades look open to me.
Jim, I disagree all the blades look open to me.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Re: HVAC disco
I also disagree: all three blades look closed (energized) to me, especially in a close-up in PSP.
I also disagree: all three blades look closed (energized) to me, especially in a close-up in PSP.
peteo
Senior Member
- Location
- Los Angeles
Re: HVAC disco
Jim, I agree. The material is factory switch gunk. Looking closely, I noticed also that the blades do not appear to be engaging the same. It's hard to tell, looking from in front. It also looks as if the left blade is engaged, buried in switch gunk, while the other two contacts are visible. The fixed blades are recessed on the two right ones, while the left appears to extend all the way out to the edge of the plastic frame. Probably my imagination, but might be broken (as you said,) or it might be a 'make before' contact, as with a twist lock where ground engages before the power. In this case, the neutral before power legs?
Jim, I agree. The material is factory switch gunk. Looking closely, I noticed also that the blades do not appear to be engaging the same. It's hard to tell, looking from in front. It also looks as if the left blade is engaged, buried in switch gunk, while the other two contacts are visible. The fixed blades are recessed on the two right ones, while the left appears to extend all the way out to the edge of the plastic frame. Probably my imagination, but might be broken (as you said,) or it might be a 'make before' contact, as with a twist lock where ground engages before the power. In this case, the neutral before power legs?
hbiss
EC, New York NEC: 2017
- Location
- Little Falls, New York NEC: 2017
- Occupation
- EC
Re: HVAC disco
Other than the problems already pointed out with the EGC and lack of bonding I have no idea what you are talking about.
I give up, we give up. Now tell us what the heck you are talking about.
-Hal
Other than the problems already pointed out with the EGC and lack of bonding I have no idea what you are talking about.
I give up, we give up. Now tell us what the heck you are talking about.
-Hal
websparky
Senior Member
- Location
- Cleveland, Ohio
Re: HVAC disco
Gosh! I never thought it would go this far.
The switch is in the off position.
The gunk is lube.
The EMT locknut is missing.
The enclosure is not bonded.
The EGC will be switched.
Violation of: 250.104(B)
Gosh! I never thought it would go this far.
The switch is in the off position.
The gunk is lube.
The EMT locknut is missing.
The enclosure is not bonded.
The EGC will be switched.
Violation of: 250.104(B)
The condensing unit will still have the control voltage energized and with the switch in the open position the condensing unit will not be bonded. This would also create a touch potential difference.
peter d
Senior Member
- Location
- New England
Re: HVAC disco
Where is a 24 volt control system required to be grounded/bonded?
How is it possible to create dangerous touch potential from a 24 volt control transformer?
Where is a 24 volt control system required to be grounded/bonded? - Status