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Acerero, I would definitely like more info. I'm not electrical, I'm mechanical, so some of the explanation may be a bit over my head. However, I can have one of our EEs look at it with me and try to help me understand it. My email is 'daphne@sphynxter.com' I really appreciate your help. Daphne

Hi Acerero. Our furnace has a single 28" diameter graphite top electrode. Also, our bottom electrode is the steel pin design with a conductive furnace bottom. What did you do to avoid the roof-arcing problem?

Thank you all for your advice and suggestions. They have been very helpful. I think I am going to try to find that book by Blodgett and do some in-depth reading on the subject. The crane does have bumpers, by the way. I forgot to mention that in my original post. They are solid...

I am modifying the endstops for a large overhead crane in our shop. The crane weighs about 80,000 lb and I assume the maximum speed when it hits the stops to be 120 feet per minute(this is a constant velocity, i.e. zero acceleration). Of course, the operator should never actually be going this...

JIC fittings are sized in sixteenths. For example, if the fitting shows the number 8 on it, just divide this number by 16 and that gives you the size of the fitting in inches: 1/2 inch. If the fitting says 16, the size is 1 inch, and so on. Remembering this is easier than memorizing the JIC...

I work in a structural steel mill which uses a DC Electric Arc Furnace (13.8 kV). We have been having problems for quite some time with the electrode arcing to the furnace roof and damaging the water cooled panels. I am currently researching ways that I can electrically isolate the roof from...