So I am researching how to wire a warehouse that will be used with 3 phase machinery. A lot of it will be retrofitted or built from the ground up because its a maker space.
According to Wikipedia:
NEMA connector - Wikipedia, the free encyclopedia
NEMA L14 and NEMA L18 can be used with only a neutral and no ground; allowing both 3 phase 208 and 120 single phase to a machine with only 4 conductors. The problem is that while working on my mill I have had noise problems with limit switches and such.
The real question is can I get away with 4 conductors but wire the machines internally to avoid noise.
I'm aware that the are standards that include L-L-L-N-G. The reason for avoiding these is the extra cost and unavailability of 5 conductor wiring and connectors.
Also I'm not asking for safety reasons because this is a twist lock system and a NEMA standard.
Any insight is appreciated.