L-14 vs L-15

[karn]

I need to install some devices for some refrigeration units, they are 208v 3 phase units that came from the manufacturer with L14-30 Plug ends, is it acceptable by NEC to use a L14 for 3 phase?

 

[Smart $]

I do not believe the NEC makes such distinction directly. To comply with the NEMA standard, an L15 should be used for 3Ø.

 

[karn]

Thank you, I know I posted in the wrong spot, I clicked on the wrong forum trying to navigate with my phone

 

[zbang]

I do not believe the NEC makes such distinction directly.

It obliquely says in 406 that attachment plugs have to be arranged so you can't mix voltages/etc, I take that to read that a receptacle supplying 3p+G can not be the same type as one supplying 2p+N+G. So it's only OK if if all L14-30s in the facilities are wired the same way.

In general, using a L14-30 for 3-phase is a bad idea (unless you have a corner-grounded delta, then IMHO it's a slightly less bad idea).