Ek's Home   |   Forum   |   Chat   |   Electrical Links   |
	Subject - 240V single phase - standard poles? timeportdvs Hi everyone, maybe some power experts can help me out here. Does anyone know where i can find some offical Electrical Standards documentation about 240V power? Specificly - is the standard US 240V standard (over NEMA-L6-30 R/P) is that 120V over 2 legs or can it be 240V over 1 leg? I currently have: commercial -> rectifier -> batteries -> inverter -> Equipment with the inverter "ON", I am reading 240V over 1 pole at the receptical, but when i put the inverter into "maintenance bypass" - which causes it to draw power from the commerical source directly, it reads 120V over 2 legs at the receptical. My "Equipment" vendor has already confirmed w/ me that they require 120V over poles for it to operate properly. So now i need some documentation to prove to the facilities people that they messed up the inverter - cause they keep on telling me that 240V over 1 pole is just fine. Your help is greatly appreciated. Thank you Jimmy Scott Vickrey NEMA-L6-30 R/P is a 240vac with a ground configuration rated for 30 amps. You should be able to measure 120vac from each ungrounded conductor to ground and 240vac between the two ungrounded conductors. Here's a link to a NEMA chart. http://www.hubbell-canada.com/wiring/bryant/pdf/q.pdf