Hi,
I am trying to find the number of years that the current NEMA 250V and 277V receptacle configurations (6-20R, 6-30R, 7-20R, 7-30R) have been in effect?
Does anyone know if the adopted configurations for 250V and 277V were different 20 to 30 years ago?
Does anyone know when approved applications for 277V receptacles/plugs changed?
I cannot provide specific details, but the matter I am looking may involve a misapplication of a 250V plug with a 277V source.
Any information or suggestions about where to find more information would be appreciated.
I am trying to find the number of years that the current NEMA 250V and 277V receptacle configurations (6-20R, 6-30R, 7-20R, 7-30R) have been in effect?
Does anyone know if the adopted configurations for 250V and 277V were different 20 to 30 years ago?
Does anyone know when approved applications for 277V receptacles/plugs changed?
I cannot provide specific details, but the matter I am looking may involve a misapplication of a 250V plug with a 277V source.
Any information or suggestions about where to find more information would be appreciated.