Can anyone tell me if all GFCI's have open neutral protection. I have a call into UL but haven:t heard back from them as of yet.Also is this type of GFCI required on all construction sites. I know it is Not a code requirement (open neutral protection on gfci) but I think its a OSHA requirement.

No, all GFCI receptacles do not have the open neutral protection circuit required by OSHA for extension cords on construction.

I;m being told its also required on temp. power panels as well as cords. Trying to get an answer on this.Not all use gfci cords some install gfci breakers in Temp. Pwr. pnls.

As far as I know, the open neutral protection is only required on portable GFI devices.