Does 225.26 refer only to open individual conductors that are supported by a porcelain knob or similar, OR for any conductor, whether in a cable or not, even if supported by a messenger wire with strain insulators?
Does anyone have any manuf spec on fittings, equipment, details of how to properly span and support OH conductors. I am dealing with lots of holiday lights on both public and private properties. There are many installations where insulated conductors are wrapped around tree branches strung from tree to tree, pole to tree, pole to pole, etc. and then christmas lights are wrapped around the pole or tree. I am trying to get a handle on these types of installations and before the questions come, I am trying to get prepared by anticipating them. Any help is appreciated. Thanks guys.
I always felt the NEC just went on vacation in December. I could never rationalize the junk people string in the bushes around the house and staple to the eaves with the wiring we demand the rest of the year. I doubt most of this gets GFCI protection (it gets fished out a window) and they certainly don't have any load calculations.
Re: OH conductor spans#96264 11/15/0505:51 AM11/15/0505:51 AM
I always felt the NEC just went on vacation in December. I could never rationalize the junk people string in the bushes around the house and staple to the eaves with the wiring we demand the rest of the year.
It seems to me that more and more are never taken down, they just get plugged in each year with out any clue to the condition they are in.
Are resturants and bars the worst offenders in your area too?
It seems they get the CO before the decorators show up and they will use whatever they find on sale at *-Mart to light up the place. I see the cheapest looking holiday light strings stapled to the rail of boat docks over salt water where the customer might be standing in an inch of water when he ties his boat up to that rail. The more I see the more I think this electricity stuff can't be that dangerous or we would be tripping over bodies. ... but I know better. I guess god looks out for drunks and fools. One of the worst offenders is the city/county when they have an outside event. I know we are supposed to be inspecting carnivals and fairs but when the government does it they seem to be immune.
590.4(J) Exception: For holiday lighting in accordance with 590.3(B), where the conductors or cables are arranged with proper strain relief devices, tension take-up devices, or other approved means to avoid damage from the movement of the live vegetation, trees shall be permitted to be used for support of overhead spans of branch circuit conductors or cables.
A small change in the '05 NEC.
otherwise vegetation is not permitted as support overhead.