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Hi Ralph, 1) Blocks are filled with vermiculite as I recall another long time engineer in the plant, telling me. No steel reinforcement. 2) News flash: I just got word back from ips supplier. He agreed to allow minimum of 6" spacing to steel. So steel is now allowed as a lintel. (Lintle?) This...

Tipsman, I am investigating that now with the ips manufacturer. Since the steel will potentially be as close as 1 foot away from the water cooled induction cables (room is very, very, tight), I'm guessing they will come back to me and insist on wood or aluminum. Who knows, maybe I'll build a...

Michael, Ralph, Mike, Great input. Many thanks. Rather than risk loosing energy and induction heating steel components in the wall, I may resort to a center aluminum beam support, after we remove the old ips and install the new (about 3 or 4 days total). In your opinion, would a single...

Michael, Thanks for the response. The 24" roof panels are 12 feet long, the roof panels are 8" thick, and I intend to keep 5 courses of concrete block above the lintel. Does that make it look better or worse? I have contacted our local engineer here, but would appreciate your opinion...

Greetings all, I'm an EE replacing an induction power supply (ips) in my factory, and I'm getting into the structural world (and not happy about it). But one of you could make it more fun. I must cut a hole in a concrete block wall that will be 10 ft. wide and high enough to remove the old...

Gunnar, Good question about rectifier vs. thyristors. Our two existing rectiformers have 12 pulse rectifiers. I know our small one (6 mWe) has 360 rectifiers. I'll e mail my contact in Europe and find out for sure that this is the same. I'm betting it is, but it sure is a good idea to check...

My company estimated arc flash hazards for equipment based upon voltages. We call 50 to 250 volt hot work HRC 1 requiring ATPV 5 clothing. We call >250 to 1000 volt hot work HRC 2 and require ATPV 8 clothing. We did this to just get some program of protection going for our people quickly, and we...

Keith et. al, I appreciate your thoughts of which I've had similar ones myself. Now I've changed my mode to deciphering Italian and European tap changer nameplate standards. I just got a copy of the nameplate in Italian from our European staff. It says the "Volt A Vuoto" is 5682 <divided by>...

Hi guys, Thanks for the rapid response. About that 50/60 HZ book or paper. Does it exist? What's the definitive guideline for this? OK, 50 Hz device is OK to run on 60 Hz magnetically. We will figure out some de-rate to run conservatively and not over amp the unit. But the voltage thing is...

My first post in Eng-Tips and it's a toughie for me. Greetings 50/60 and 60/50 hertz experts! I can get a surplus 50 HZ 8 mva furnace rectiformer from a closed factory of ours in Europe for just the cost of transporation to the US. It comes with an autotransformer with a 20 KV primary input...