In a message dated 2005-12-17 07:19:01 PM Eastern Standard Time, [EMAIL PROTECTED] writes:
> More like a wiring error IMHO, I have had a similar problem in Au where > an electrician did not realise what 208V equipment was :( Drew a hell of > a lot of current for a few reasons ;) I'd concur wholeheartedly after thinking it over for a bit. Key is the difference between a wye vs delta connection. > > > > As to the voltage conversion, be careful how you're measuring things. I > may > > have this backwards, but I believe 208V normally refers to a delta > connection, > > whereas 240V refers to a wye connection. Picture the voltages of each > phase as > > an equilateral triangle centered at and spinning about the origin. The > sides > > of the triangle are 208V long, and each of the corners is 120V from the > > origin, which represents the neutral. Thus if you measure one phase of a > delta > > connection (where you're measuring between two of the phase wires) you see > 208V, > > vs. measuring from a phase to the neutral where you see 120V. I lost a > factor of > > two somewhere in the visualization, but the basic concept is correct. Is > it > > possible that you've somehow crossed up the motor connections such that > it's > > expecting a delta connection but you've supplied a wye connection? That > too > > would account for a very heavy current. > > There is a mathematical formula for this, but stuffed if I can remember > this (besides it is 0815 on a Sundry morning and I have not had the > wakeup levels of caffeine or nicotine yet) > Simple ratio of sqrt(3) / 2 between the 208V and the 240V. Steve Hendrix ____________________________________________________________ You are subscribed to the OT discussion forum To Post messages: mailto:[email protected] Unsubscribe and Other Options: http://techservinc.com/mailman/listinfo/ot_techservinc.com Browse or Search Old Archives (2001-2004): http://www.mail-archive.com/[email protected] Browse or Search Current Archives (2004-Current): http://www.mail-archive.com/[email protected]
