[Sean_R]

Does anyone happen to know if 208 VAC 2-phase charging is supported on the Volt, rather than 240 VAC bi-phase? Just curious if this is specified either on the Volt, or perhaps with the J1772 standard.

 

[SharkVolt]

I believe all Volts can charge off 208 volt power, but the charging rate will be reduced by about 10%, due to the lower voltage.

 

[Qinsp]

My work L2 is 208vac, which is two legs off 208 3ph and has worked fine for over 3 years.

 

[Sean_R]

Good to know - thanks! It just occurred to me that *my* work chargers may also be running off of 208 V, but I don't know how they're wired.

 

[Qinsp]

A commercial building has a WYE transformer for it's 120vac 1ph power. It has 4 wires going out:

L1 - Hot 120v
L2 - Hot 120v
L3 - Hot 120v
White - Neutral for 120v

Any two of the L1, L2, or L3 lines when hooked to power leads makes 208vac, not 120v. Why? They are 120° separation. Only when they run a 3 phase motor do they kick out 240v.

You do not use the Neutral on a 208 circuit. You would use a second Hot instead.

 

[hvacman]

A commercial building has a WYE transformer for it's 120vac 1ph power. It has 4 wires going out:

L1 - Hot 120v
L2 - Hot 120v
L3 - Hot 120v
White - Neutral for 120v

Any two of the L1, L2, or L3 lines when hooked to power leads makes 208vac, not 120v. Why? They are 120° separation. Only when they run a 3 phase motor do they kick out 240v.

You do not use the Neutral on a 208 circuit. You would use a second Hot instead.

120/208 "wye" is the current "standard" way of getting 3 phase and 120 volts 1 phase out of a single service, but there are also lot of 120/240 "high-leg delta" 3 phase systems out there which work differently.

https://en.wikipedia.org/wiki/High-leg_delta