I have been asked to cover two large MG sets with open windings on the motor and generator.

Are there any special safety precautions that should be taken when working in such close proximity to these windings, brushes, lugs, etc.?

Thanks,

Danny,

I have seen Big Muskies (and a 2570) mg set that shorted and threw copper balls about like bb's for 100 feet in all directions.
However, I never had one do anything while I was collecting data on it. You need to practice the same electrical safety you would around any other open buss. Be sure you don't have any loose metallic objects on your body flopping around. Certainly don't touch any exposed busswork or lugs. It's not as bad as what it may look, just be cautious.

Dave

Dave,

I plan to keep everything out of the works if possible. There isn't any history of problems with these so I should be able to be in and out quickly and safely.

Thanks

I do a fairly large number of them; when approaching (see brushes, etc...) do you notice hums, electrical noise or see a lot of sparks? Housekeeping OK and no tripping hazards around proceed on. So many I do have no covers in place so you can see every thing and of course more exposed as well.

I am used to opening up exciters on generators and taking reading on them by sticking my hand in there. It makes many too nervous so I never demand my techs to do it unless they feel comfortable. I let them watch me and then make the call. Some can't do it for the sweat running off their forehead.

Sam,

Sweat is a genuine problem for me. Since suffering a severe heat stroke a year ago, I break out in a sweat as soon as I enter most plants.

Houskeeping is good in this area, but this is a ductile iron pipe foundry s any dust that is present is probably quite conductive and combined with the sweat pouring off my forehead, it could present a hazard.

There is no visible arcing from the brushes and no electrical hum apparent, so that is on my side.

Thanks for the input.