GFCI Tripping

[augie47]

Seemingly topic du-jour lately...
Friend called... new restaurant installation 120/240 I have not viewed the installation.
All the GFCI breakers on "B" phase are tripping...move same breaker to "A" phase and they hold.
Voltages phase to phase and phase to ground are good,
Suggestions as to cause ?
(Siemens breakers)

 

[LarryFine]

Logical conclusion: B phase is too high or low in voltage.

(Only 1ph, not a high-leg delta, right?)

 

[augie47]

Logical conclusion: B phase is too high or low in voltage.

(Only 1ph, not a high-leg delta, right?)

All input is via phone::
120v L to N both phases No High-Leg (that was my first concern when they used the term "B" phase)

 

[ptonsparky]

Cycling 120 volt inductive load on B.

like a starter chattering off/on.

 

[mtnelect]

It's the "Energy Efficiency" new equipment that is responsible for it. The GFCI do not like the signature that is put out to control the speeds of the new DC speed control motors and equipment.

 

[curt swartz]

It's the "Energy Efficiency" new equipment that is responsible for it. The GFCI do not like the signature that is put out to control the speeds of the new DC speed control motors and equipment.

Did you actually read the OP?

 

[mtnelect]

Listed the wrong TIA

Did you actually read the OP?

Yes ... It's "All the GFCI breakers on B". It's a GFCI problem.

 

[curt swartz]

Listed the wrong TIA


Yes ... It's "All the GFCI breakers on B". It's a GFCI problem.

They why do they hold when moved to "A"???

There are millions of VFD;s connected to GFCI'S that work fine. Some VFD's are not compatible with GFCI's do to high frequency "noise" This is why new standards need to be made for breakers and equipment.

When GFCI's were first introduced there were appliances/utilization equipment that were not compatible. New standards had to be made for leakage current. That didn't mean nothing was comparable with GFCI's.