As some of you may have surmised, I work for an agency which operates marine commerce vessels. Please forgive me for not providing additional details, as I am in a very politically charged situation.
I was called in to troubleshoot an event which popped up recently. The vessel normally runs...
Hi folks, "Heard" about an interesting possible electrical safety hazard today. This was at a shipyard (saltwater) where work is performed on vessels moored at a pier. The shore power for the vessels is 480. This is supplied by a Square D SE series breaker, 1200 Amp. This in turn fed...
Now here's a possibly funny one. Today we were discussing the relative merits of having sight glass tubes versus using magnetic and other types of sensors. I kind of "off the cuff", related how an old ships engineer had once told me he could tell the viscosity of an oil by reading it's...
Hi,
I work on large DC propulsion motors. There has been a lot of problems with commutators lately. Personally, I feel this may have to do with outdated AC to DC rectification issues. But, that would be for another thread. What I would like to talk about is favorite ways to undercut and...
I am putting this out here for thoughts on whether or not it might be more advisable to service particular circuit breakers "in place", by a qualified vendor, versus removing them and sending them out to a qualified shop to be serviced. I will not mention my employer, as the job...
Hi Folks,
I was called in to assist with the cable pull for power feed to a couple of ABB VFDs. They will be controlling two 75 hp 3 phase 480 motors, non-simultaneous use.
The cable provided is DLO 3/0 to be run parallel, 2 runs of 4 cables each, 60 and 120 feet respectively.
They have...
Anyone bored and ready for a fun exercise? I recently came across an old Cat generator (rather large) with no nameplate data readable except the name. It has 20 leads coming out of it. None of the leads are ID'd. I suspect that it may be the "two gens in one" program. Wondering if anyone...
