110.12 (D) Sharp Edges. Field modified electrical equipment shall be designed installed and maintained that users, installers and maintenance personnel will not be likely to come into contact with sharp edges.
Some equipment is modified in the field that the installer or users of the equipment come into contact with sharp edges. Often cutting there fingers or hands. Some examples are punched or cut enclosures and knockouts that leave a sharp edge near the front of th enclosure that one has to reach over or by to work on or in the equipment.
Panel Meeting Action: Reject
The proposal does not address an electrical hazard and is not consistent with the stated purpose of the Code in 90.1(A).
Number Eligible to Vote: 12
Affirmative: 12 Ballot Results: Affirmative: 12
I think that the committee members who were at the ROP meetings should be reminded that the subject of those sharp edges is a real problem.
If I was making electrical inspections and rejected the equipment, you'd see how fast our Testing Agency Friends would revise their standards.
Some of the CMP-1 Members would agree that the cut they have on their finger or palm was caused by the sharp edges when they (if they worked with the tools) long ago.
I will send in a comment on this after I review my library of images to be used as substantiation.
If any members here have those types of images please send them to me -- we are now entering the comment battlefield!!
Yes, and the term "sharp edges" is used in about 6 locations in Chapter 3.
110.3(A)(8) could be of use though, but we need to address the cuts issue and see if the original proposal can be rewritten to address the same items below then the problem would be almost solved and the cuts may be fewer.
Here are some of the rules:
Cellular metal floor raceways shall provide a complete enclosure for the conductors. The interior surfaces shall be free from burrs and sharp edges, and surfaces over which conductors are drawn shall be smooth.
Cable trays shall not have sharp edges, burrs, or projections that could damage the insulation or jackets of the wiring.
Where wires pass through an opening in an enclosure, conduit box, or barrier, a bushing shall be used to protect the conductors from the edges of openings having sharp edges.
Where insulated conductors are clamped to the structure, the conductor insulation shall be supplemented by an additional wrap or layer of equivalent material, except that jacketed cables shall not be required to be so protected. Wiring shall be routed away from sharp edges, moving parts, or heat sources.
Joe Tedesco, NEC Consultant
Re: Help Me! I cut my finers, and the NEC won't be of any help to me!!#85881 08/17/0310:05 PM08/17/0310:05 PM
Joe What if the wording was changed from Maintenance personnel to conductors. By changing the wording, maybe they will accept it. Protecting conductors is much more important, you will have to have a body count otherwise. Politicians do this all the time.
Re: Help Me! I cut my finers, and the NEC won't be of any help to me!!#85882 08/18/0306:39 AM08/18/0306:39 AM
Joe, why limit this to "field modified" equipment? The manufacturers leave very sharp edges on many items. I can't think of too many cases where field created edges are left exposed, but many where the manufacturer created edges are left exposed. Don
Re: Help Me! I cut my finers, and the NEC won't be of any help to me!!#85884 08/18/0308:09 AM08/18/0308:09 AM