Quote Originally Posted by AndyUK View Post
The first issue I take with this claim is that its not a 250% increase. He says 2 years to 5 years, which in my book is an increase of 150%, as an increase of 100%. (i.e. doubling) is 4 years.
You have to remember that salespeople for big American corporations aren't always the best at maths! One of the failure mechanisms that I hadn't appreciated before was ground currents (due to cable asymmetry, hence the preferred 3+3E configuration) flowing through motor bearings which apparently shortens their life. I'll miss out on this one as my JK spindle has ceramic bearings, happy days

On another tack I did a bit of searching whilst nibbling at my spicy turkey bun this lunchtime, and quite a few people do these 3+3E VFD cables, however sadly no-one seems to make them in less than 1.5mm2, and they all seem to have a pretty massive minimum bending radius, typically 20x diameter, which given the large cable OD's (10...13mm for 1.5mm2) is not useful for the typically "small" machines the likes of us are making. Also a lot of the problems with voltage spikes/ringing are more likely with high voltage (380V+) systems with long cable lengths, again not a likely scenario for us.