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Tool Talk Discussion Forum

How far away for a disconnect switch on a belt con

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bob11

05-13-2006 21:15:25




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On a belt conveyor is it code to have a disconnect switch from electricity? If so how close does it have to be from the conveyor? I am thinking of just using the plug in to start stop the belt?




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dr.sportster

05-14-2006 12:39:39




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 Re: How far away for a disconnect switch on a belt in reply to bob11, 05-13-2006 21:15:25  
Ive been doing the electric for a conveyor in a large postal facility.The building is named for a guy who died after having his arm ripped off in a conveyor.Every three feet is an E-stop button.I guess thats close enough to stop it if your getting caught up in it.Good for saftey and electrical work[but not cheap]. The NEC does not apply to a postal facility because they are their own authority.There are entire panels wired with green branch circuits which is going to get someone killed.Dont know who did that maybe in house guys.There is some really bad pipe work also.I dont think the code talks about this requirement[other than 430.74] it is in an OSHA book maybe?

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Mark - IN.

05-14-2006 04:58:13




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 Re: How far away for a disconnect switch on a belt in reply to bob11, 05-13-2006 21:15:25  
Wayne, if it's stationary at a work place, it probably is code. And you're right about the pull rope safety switch, they work. Easy to get caught up in one, just like a PTO, it happens when you least expect it.

Its not your conventional belt conveyor, but it is a belt conveyor nonetheless, used as a man lift, and I've ridden it countless times over the years, never again. A fellow was just killed on it a couple/few weeks or month ago. He didn't caught up in it, he slipped and went head first into the concrete about 5 stories below. Even though OSHA came in and said it was safe afterwards, including all of the various safety switches (pull rope, over the top, under the bottom, etc), I can't think of anyone that's gonna take that thing again. Not me either, for sure.

Mark

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NC Wayne

05-13-2006 21:41:14




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 Re: How far away for a disconnect switch on a belt in reply to bob11, 05-13-2006 21:15:25  
I don't know what the code is, but if it's like everything else it'd probably vary depending on the type of conveyor, etc. If it's one you, or anybody else for that matter, is gonna be working around and there's even a small chance of getting caught up in it, install a safety pull rope down one or both sides. Basically this is a switch located at one end of the conveyor, and tied in with the control circuit so it opens the contacts on the the motor starter, with a pull on a cable attached to the switch. The cable runs from one end to the other so you can stop the motor from any point along the length of the conveyor. Again I'm not a certified electrician but I've been around alot of conveyors over the years and seen and heard of enough guys getting tangled up in them to know that it's always better to be safe than sorry.

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