Very true but unless something has changed an OSHA inspector can only use an external tester to prove that a GFCI is in use and not prove that a GFCI is not in use. If an external tester fails to trip a receptacle then the inspector is supposed to investigate further to determine if there is a GFCI upstream.No, but plug-in testers do.
Thank you, I am aware of that standard. I was asking tkb to reference the standard he keeps quoting that states GFCI's must be at the end of an extension cord vs. at the receptacle supplying the extension cord.OSHA Construction Industry Standard, as requested:
1926.404(b)(1)(ii) ?All 120-volt, single-phase 15- and 20-ampere receptacle outlets on construction sites, which are not a part of the permanent wiring of the building or structure and which are in use by employees, shall have approved ground-fault circuit interrupters for personnel protection. Receptacles on a two-wire, single-phase portable or vehicle-mounted generator rated not more than 5kW, where the circuit conductors of the generator are insulated from the generator frame and all other grounded surfaces, need not be protected with ground-fault circuit interrupters.?
All receptacles need GFCI's, from the one the extension cord's plugged into on downstream. If that one doesn't have a GFCI, it's acceptable to put a portable one there--on the supply side of the cord. Best choice is a GFCI breaker on each branch circuit (the title of .404(b) is "branch circuits").
OSHA doesn't care how long the extension cord is, unless the cord's being used contrary to its UL listing. The problem's the gauge of the conductor. Overheating and voltage drop...
http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=20251"For example, under the OSHA regulation for GFCIs, protection must be provided for the receptacles on the end of extension cord sets even if the extension cords are supplied by permanent wiring".
None.A 46,000 sq foot building site has the steel skeleton up with the 2nd floor deck serving as a porous roof. They are using corded drills to screw pre formed panels for the walls. 6 to 8 drills are plugged in at one time. 4 duplex (GFCI) outlets are wired in a wall by the entrance. A 20 amp breaker is on the outlets. They are running a 50 ft cord with a spider box. They are running 5 100 ft cord in series to reach men on the far wall. The spider is also GFCIed. A proven gfci tester will not pop either GFCI in the cuircuit. All cords are 12 hard service. Aside from wiring the building is there a good solution to this long run? The GFCI TESTER still works on regular GFCI outlets but will not pop this one with 2 GFCIs in series?
I can see how an OSHA inspector without an electrical background could misinterpret that. But it is still a misinterpratation. Thanks.http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=23868
I'm certain that some inexperienced/ignorant OSHA inspector miss interpret where the GFCI needs to be.
http://forums.mikeholt.com/showthread.php/135507-Construction-How-many-100-extension-cords-can-be-daisy-chained-together-legaly?p=1299154#post1299154My guess is zero. I think the cord set was probably tested and UL-listed for use from a receptacle to a tool. Check the manufacturer's literature that comes with the cord.