My NM135 does the following:
1) Puts a huge amount of EM crap back onto the 120VAC circuit, judging from the fact X10 stuff doesn't work if the mill is turned on.
2) Is susceptible to other devices putting crap onto the mill's 120VAC circuit. An anti-static ion generator being turned off/on on the same circuit causes funny mill behaviour: 1) sometimes a e-stop, and/or, 2) if the mill is not moving, a big fat clunk. Extremely annoying.
Isolation would be good. Any ideas?