cadpoint
Senior Member
- Location
- Durham, NC
What are you trying to do? Walk past the equipment or maybe "interacting with the equipment in a manner that could cause an electric arc (NFPA70E)"?
LOL . . .
What are you trying to do? Walk past the equipment or maybe "interacting with the equipment in a manner that could cause an electric arc (NFPA70E)"?
You can get remote operators, see http://www.remoterackingsolutions.com/remote-switch-operators.htmNo, I meant we can specify the main gear with main shut trip breaker and we can remotely turn it off when servicing the gear... but then, I am wondering how we turn on that breaker back on...
However it is made to work in conjunction with a transformer primary overcurrent device...
Several manufacturers have released european style plastic throwaway medium voltage breakers that have been tested to IEEE C37 (ANSI) requirements and are sold to retrofit into metal enclosed switch enclosures on the primary of transformers.
You can get remote operators, see http://www.remoterackingsolutions.com/remote-switch-operators.htm
Rather than a remote operator, how about turning off all the breakers below the main, then flipping the main back on. Weather it's 600amps or 800amps, what ever, so there is no load on the panel at all. And no reason for the internals of the main to arc over.
We SCUBA divers have the same joke about sharks and dive buddies. Sometimes it involves sticking your buddy with your dive knife.I ain't gotta outrun the bear, just the fella behind me. J/K my friend.
A mentor nearly died under such circumstances in the early 70's. It was an Electrocenter they were installing; they had all the starters racked out, and closed the main to bring the lights & utility outlets up.
Little did they know the busbar in the wall had slid down in shipment.
The breaker exploded, blowing the locked door open, knocking Bill onto his side, with 2nd degree burns to his arms and hands. Behind Bill, the contractor was also down.
The arcing continued, with the feeds down from the pole to the building finally burning loose, and flapping in the wind -- the arc would blow them apart [right hand rule] the arc would stop, and they'd drift together again .ZAAAP... ZAAAP...
Bill was trying to get up when the contractor ran OVER him, foot right on his back, going for the utility substation to pull the primary disconnect. Before he got there, the sub's primary fuses went "sounding like a 12 ga. going off in my ear BLAM BLAM".
He was in the hospital for 4-5 days.