TRANSITION - From Conventual Wiring to Digital Wiring

Status
Not open for further replies.
Additional information:
AC\DC said:
I don’t see we’re that states that there a gfci for higher harmonics
Click to expand...

This is a more current one:
 

Attachments

  • IMG_0980.jpg
    IMG_0980.jpg
    76 KB · Views: 6
  • TIA Log No. 1653, HVAC GFCI, 05-27-2022.pdf
    652.6 KB · Views: 7
mtnelect said:
But, hang in there ... Until September 1, 2026 !
Click to expand...
Try a Siemens brand GFCI. This has fixed multiple tripping for me on pool pumps with inverters. Commercial raypak MVB and Xtherm boilers and some ACs having issues. They have somehow figured out how to filter out noise from actual ground fault leakage. And yes sometimes this means I install a small spa pack disconnect with a siemens gfci breaker.

I also don't think listed HVAC equipment need GFCI when hardwired properly. Expanding GFCI to all exterior outlets was an over reach without proper cause.
 
SSDriver said:
Try a Siemens brand GFCI. This has fixed multiple tripping for me on pool pumps with inverters. Commercial raypak MVB and Xtherm boilers and some ACs having issues. They have somehow figured out how to filter out noise from actual ground fault leakage. And yes sometimes this means I install a small spa pack disconnect with a siemens gfci breaker.

I also don't think listed HVAC equipment need GFCI when hardwired properly. Expanding GFCI to all exterior outlets was an over reach without proper cause.
Click to expand...

Until this is all worked out, I turn the power off to the pool when in use. Just to be safe !
 
mtnelect said:
Until this is all worked out, I turn the power off to the pool when in use. Just to be safe !
Click to expand...
Most of my pool work is all Commercial pools that are required to have pumps running while in use by health department. So not on option on those.. Siemens also worked great on m multiple AC units.
 
mtnelect said:
It's my belief that "Harmonics" are the culprit in this situation.
Click to expand...

It's been well known for many years the harmonics from equipment that uses VFDs causes problems with GFCIs. This is nothing new.

There was a big problem with Pentair when they started using VFD pool pumps that had to be supplied with a GFCI. One manufacturer (Siemens?) even designed a special breaker for the application. Of course, it had to be installed in a Siemens panel. I don't know ultimately what the fix is, not sure if Pentair redesigned their pump motor drive to eliminate tripping normal GFCI breakers.

So, now that the NEC wants outdoor A/C units supplied with a GFCI protected circuit, we're back to the same problem. It's going to have to be up to the A/C equipment manufacturers to redesign their equipment to eliminate tripping whatever the cause.

-Hal
 
SSDriver said:
Most of my pool work is all Commercial pools that are required to have pumps running while in use by health department. So not on option on those.. Siemens also worked great on m multiple AC units.
Click to expand...

For safety reasons, no one in the pool when the power is on.
 
hbiss said:
It's been well known for many years the harmonics from equipment that uses VFDs causes problems with GFCIs. This is nothing new.

There was a big problem with Pentair when they started using VFD pool pumps that had to be supplied with a GFCI. One manufacturer (Siemens?) even designed a special breaker for the application. Of course, it had to be installed in a Siemens panel. I don't know ultimately what the fix is, not sure if Pentair redesigned their pump motor drive to eliminate tripping normal GFCI breakers.

So, now that the NEC wants outdoor A/C units supplied with a GFCI protected circuit, we're back to the same problem. It's going to have to be up to the A/C equipment manufacturers to redesign their equipment to eliminate tripping whatever the cause.

-Hal
Click to expand...
Please "Stand By" ... There should be an answer by September 1, 2026 !
 
mtnelect said:
For safety reasons, no one in the pool when the power is on.
Click to expand...
For your own pool do what ever you want.

Health dept says for safety reasons pumps MUST be on with automated chemical feeders to maintain circulation and sanitizer levels for commercial pools when swimmers are in water. Not sure what your arguing, facilities have no choice. Proper bonding alone keeps pools safe. GFCIs are OK if you trust the technology.
 
Status
Not open for further replies.
Top