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Cichlidae, At your job, have you ever shouted "YOU CAN'T CUT BACK ON FUNDING! YOU WILL REGRET THIS!" to anyone? (In all seriousness, this is a really, really cool thread.) Three-Phase fucked around with this message at 03:04 on Nov 10, 2009 |
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Nov 10, 2009 03:02
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| # ¿ May 21, 2024 06:57 |
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Serious question - there's a massive GM plant here near Parma that is along a pretty important artery connectiong Brookpark Road to Parma. There are a ton of traffic lights on that road that essentially do nothing but slow people down - the plant is a shell of it's former past. Is there any legal way to get these lights removed or put in red/yellow flashing purgatory?
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Nov 10, 2009 03:22
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Ahahahaha Level 4 arc flash for what's basically a PLC cabinet. I cannot imagine a high arc flash level in a cabinet like that. How is the thing powered? Is there an underground or overhead transformer that's several kVA to run the controller cabinet and a few lights at a time? IOwn should be really careful - there are 480V systems I've encountered with flash hazards going from Level 0 to >4. It totally depends on your system, how it's configured and what you're doing. For people who are puzzled by the suit, check out this video. Or stop by my thread. (SHAMELESS PLUG! Get it? "Plug?") 
Three-Phase fucked around with this message at 01:27 on May 16, 2012 |
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May 16, 2012 01:22
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IOwnCalculus posted:Oh I keep my rear end away from actually touching anything electrical, most I've ever done here is plug in the fan at my desk Oh, just distribution panels? Those can still be hazardous depending on, again, system configuration. I'm thinking of stuff like somewhat larger unit subs and motor control centers (4160V, 7200V or 13.8kV down to 480/277 at 1200A or 3000A, stuff like that. Especially right off the transformer secondary the arc flash levels can be skin-charringly lethal. Three-Phase fucked around with this message at 01:30 on May 16, 2012 |
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May 16, 2012 01:28
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I don't even have access to the hallway with said 480V->208/120 panels installed.
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IOwnCalculus posted:Yeah we don't have quite that much power here, at least not on any one single circuit. I think the biggest I saw on any one-line diagram was 600A at 12KV. 12MVA medium voltage feed? Sounds like a small factory. I think some companies make under-vests with ice packs to help make the suits more bearable when it's hot out. Indoors can be bad too, I've been in buildings where it gets to a hundred degrees+ in the summer with all the equipment running. So do those traffic lights, the actual lights, run off 120V, or something higher like 208V or 277V?
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May 16, 2012 01:53
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| # ¿ May 21, 2024 06:57 |
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Cichlidae posted:We thought up a whole list of probably illegal things we could do with them on! Not illegal, but if it wouldn't get me in trouble, I'd try and make a video with our electricians doing the Melbourne Shuffle to Party Rock Anthem with the Level 4 suits. Ha ha ha. But yeah, I've described the Level 3/4 suits as "bomb squad suits" before. Typically you'd never ever have to use them in a public space. I could see where that could draw police attention. Lots of places are trying to eliminate work where you'd need suits like that. They have an "if we have to use those suits, schedule a shutdown instead" attitude. Now if you're working on a critical system, you still need to do live work. Three-Phase fucked around with this message at 10:26 on May 16, 2012 |
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May 16, 2012 10:16
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