Code Q&A
Dec 27, 2007, By Mike Holt
Q. Is there any allowance in the NEC to locate receptacles in dwelling units where it is convenient for furniture layout or the designer’s wishes, if the required number of receptacles is installed?...
Code Q&A
Dec 13, 2007, By Mike Holt
Q. Is it permissible to run heating/air-conditioning duct 4 feet above a panelboard if the ductwork services the room where the panelboard is located?...
Code Quandaries
Dec 1, 2007, By Mike Holt, NEC Consultant
Q. If structural steel is used as a grounding electrode for the electrical service, is it also necessary to supplement the steel electrode with an additional electrode such as a ground rod?...
Code Q&A
Nov 27, 2007, By Mike Holt
Q. A single main breaker is installed, then taps supply individual meters with disconnecting means for individual tenants. Should a main bonding jumper be installed at the single main breaker or at each separate disconnect?...
Code Q&A
Nov 13, 2007, By Mike Holt
Q. When a conduit leaves a Class I, Division 1 classified paint spray room and goes under the concrete floor into a cabinet in the motor control room that is non-classified, is one sealing fitting in the paint mix room sufficient, or is an additional sealing fitting required in the non-classified area as well?...
Code Quandaries
Nov 1, 2007, By Mike Holt, NEC Consultant
Q. What is the minimum depth for placing Schedule 40 PVC conduit below a concrete slab?...
Code Q&A
Oct 26, 2007, By Mike Holt
Q. How far away from a diesel fuel-dispensing tank must the nonexplosion-proof equipment be located?...
Code Q&A
Oct 12, 2007, By Mike Holt
Q. When are insulated bushings required on raceway terminations?...
Code Quandaries
Oct 1, 2007, By Mike Holt, NEC Consultant
Q. Where in the Code does it say that sharing a neutral is acceptable?...
Code Q&A
Sep 27, 2007, By Mike Holt
Q. A conductor passing through a box unbroken counts as one conductor, so if I loop a conductor through the box unbroken and strip off enough insulation to terminate on a receptacle without cutting the wire, does the conductor count as one or two conductors for box sizing?...
Code Q&A
Sep 13, 2007, By Mike Holt
Q. I want to install fluorescent strip lights on a sheetrock ceiling. Can I support the fixtures directly over the recessed outlet box and connect to the branch-circuit wiring through a chase nipple?...
Code Q&A
Aug 13, 2007, By Mike Holt
Q. Can I use aluminum rigid metal conduit in a Class 1, Div. I hazardous (classified) location?...
Code Q&A
Jul 27, 2007, By Mike Holt
Q. Can the disconnect switch be located next to equipment installed above an accessible drop ceiling, or must the switch be installed at a readily accessible location?...
Code Q&A
Jul 13, 2007, By Mike Holt
Q. In a dwelling unit, what are the receptacle requirements for island counter tops?...
Code Quandaries
Jul 1, 2007, By Mike Holt, NEC Consultant
Q. Can I pass conductors from one panel through another panel? If so, what are the restrictions?...
Code Q&A
Jun 27, 2007, By Mike Holt
Q. What are the requirements for supporting outlet boxes above/to suspended ceilings?...
Code Q&A
Jun 13, 2007, By Mike Holt
Q. When a lighting and appliance panelboard is fed from the secondary of a 3-phase transformer, is the panelboard required to have a main breaker installed in it?...
Code Q&A
May 29, 2007, By Mike Holt
Q. Can I install conductors from different panels in the same raceway?...
Stumped by the Code?
Apr 1, 2007, By Mike Holt, NEC Consultant
Q. Is it legal to make a mechanical transition from electrical metallic tubing (EMT) to flexible metal conduit with a fitting that joins these two raceways instead of installing a box?...
Stumped by the Code?
Feb 1, 2007, By Mike Holt, NEC Consultant
Q. Can I ground a satellite system to the metal parts of electrical equipment?...
Stumped by the Code?
Dec 1, 2006, By Mike Holt, NEC Consultant
Q. Do I need to use hospital-grade receptacles in a chiropractor's or medical examining room?...
Code Q&A
Nov 27, 2006, By Mike Holt
Q. What are the limitations on the use of rigid nonmetallic conduit in an underground application serving a gasoline dispenser?...
Code Q&A
Nov 13, 2006, By Mike Holt
Q. Can Table 310.15(B)(6) (reduced size wire for dwelling unit service) be used to size the service neutral conductor for a single-family dwelling?...
Stumped by the Code?
Nov 1, 2006, By Mike Holt, NEC Consultant
Q. How far away must I locate a receptacle outlet from a shower or bathtub?...
