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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Yep posted by Ted Smith on July 16, 2006 at 10:03:16:
This does happen with copper and this is why proper maintenance includes "thermoscanning" for hot spots. This is routine in critical installations such as data centers but is often neglected elsewhere. If screws loosen over time, it can lead to disaster.One day another engineer and I were in a company leased building when one of the maintenance electricians showed us a 100 amp disconnect switch in a box so hot, I burned my finger touching it for one second. You don't EVER want to turn one of these off yourself unless you know exactly what you are doing. You MUST disconnect all of the load first or the switch could explode when you try to open it and you could be badly injured or even killed. We went back to our office and persuaded the operations manager to order an emergency shutdown of everything connected to it and to open the feeder circuit which caused quite a disruption to the facility. We contaced the field and I asked the electrician at the site whether the feeders were copper or aluminium since we were taking bets. His answer was...we don't know yet, they are still glowing cherry red. That melted down switch was hung in the wall of the maintenance electrical shop for years.
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- Re: Yep - Soundmind 18:22:51 07/18/06 (0)
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