Code Quiz 

Aug 26, 2010, By Steven Owen

With respect to interconnected electric power production sources (Art. 705), is it required to automatically disconnect a 3-phase primary power source from all ungrounded conductors when one of the phases opens to create a loss of power on one or more phases? ...

Code Quiz 

Aug 12, 2010, By Steven Owen

When is it permissible to install a listed plug-in-type backfed circuit breaker in a panelboard, without an additional fastener to secure the circuit breaker, so that removal of the circuit breaker requires other than a pull to release the circuit breaker from the mounting means on the panelboard?...

Code Quiz 

Jul 22, 2010, By Steven Owen

With respect to Art. 708 Critical Operations Power Systems (COPS), where physical security is required, the physical security shall consist of which of the following items?...

Code Quiz 

Jul 8, 2010, By Steven Owen

With respect to Art. 708 Critical Operations Power Systems (COPS), from which NFPA document are rules extracted?...

Code Quiz 

Jun 24, 2010, By Steven Owen

There are five ½-in. rigid metal conduits installed underground and connected to gasoline-dispensing equipment and other associated equipment. ...

Code Quiz 

Jun 10, 2010, By Steven Owen

With respect to single-pole circuit breakers used as disconnecting means for circuits, when is the use of identified or non-identified handle ties applied to multiple single-pole circuit breakers (intended to simultaneously disconnect all conductors of the circuit, including the grounded conductor, if any) not permitted?...

Code Quiz 

May 20, 2010, By Steven Owen

When are low-voltage control equipment, relays, motors and the like permitted to be installed in compartments with exposed high-voltage energized parts or high-voltage wiring with respect to equipment that is operating at over 600V?...

Code Quiz 

May 6, 2010, By Steven Owen

When installing service equipment for services rated more than 35kV (phase-to-phase), where conductors enter a building, the conductors shall terminate in _________....

Code Quiz 

Apr 22, 2010, By Steven Owen

In a surface metal raceway that measures 4 in. by 2 in., what is the maximum number of 12 AWG THHN, 600V insulated, single conductors, operating at 480V nominal permitted?...

Code Quiz 

Apr 8, 2010, By Steven Owen

When installing a flexible cable drop to a machine that requires frequent moving, can the cable be installed directly connected to the overhead busway plug-in device (i.e., busway switch) using appropriate tension take-up support devices without an attachment plug? ...

Code Quiz 

Mar 25, 2010, By Steven Owen

When installing outlet boxes designed for the support of luminaires, what are the specifics when the luminaire weighs more than 50 lb?...

Code Quiz 

Mar 11, 2010, By Steven Owen

When installing outlet boxes for wall-mounted luminaires, when can you use No. 6 screws to secure the luminaire yoke to a plaster ring?...

Code Quiz 

Feb 18, 2010, By Steven Owen

With respect to Art. 240 (Overcurrent Protection), which of the following scenarios permits the use of a slash rated circuit breaker in a circuit?...

Code Quiz 

Feb 4, 2010, By Steven Owen

What is the interrupting rating of a circuit breaker that has no interrupter rating marked on it? ...

Code Quiz 

Jan 21, 2010, By Steven Owen

When installing disconnecting means for multi-wire branch circuits in temporary installations, the disconnecting means must disconnect all ungrounded conductors at the power outlet or panelboard where the branch circuit originates. ...

Code Quiz 

Jan 7, 2010, By Steven Owen

When installing underground service conductors to a building or structure, where the service conductors are installed in a trench that has 24 in. of cover, what marking is required at what distance above the underground installation? ...

Code Quiz 

Dec 17, 2009, By Steven Owen

When working with electrical systems, including multi-conductor cables, identification of conductors is an important issue. ...

Code Quiz 

Dec 3, 2009, By Steven Owen

A question has arisen related to the installation of a new 112.5kVA dry-type transformer, which is equipped with ventilated openings....

Code Quiz 

Nov 19, 2009, By Steven Owen

A branch circuit overcurrent device is a device capable of providing protection......

Code Quiz 

Nov 5, 2009, By Steven Owen

What are the minimum and maximum lengths permitted for the grounding conductor on network-powered broadband communications systems network interface units that contain protectors?...

Code Quiz 

Oct 22, 2009, By Steven Owen

When installing receptacles for circuits and equipment operating at less than 50V in kitchens, laundries and other locations where portable appliances are likely to be used...

Code Quiz 

Oct 8, 2009, By Steven Owen

What is the required minimum depth of the working space in the direction of live parts?...

resources

Select Newsletter G-Biz CodeWatch eTRAIN electricalZONE PQNewsBeat MROInsider Product NewsWire Select EC&M Book National Electrial Code Books EC&M's Practical Guides Conduit Bending Electrical Topics of Interest Stallcup's Books OSHA Electrical Wholesaling Books Select Special Report Top 40 Design Firms Top 50 Contractors Product of the Year 100 Years of EC&M Select Webinar Trade-Offs With Arc Flash Safety, Selective Coordination and Protection Costs and Causes of Hidden Power Quality Problems Arc Flash/HRG Technology's role in prevention 3 A’s of Arc Flash Dramatic Changes to the Residential Load Center CEE News Archive September 1, 2002 August 1, 2002 July 1, 2002 June 1, 2002 May 1, 2002 April 1, 2002 March 1, 2002 February 1, 2002 January 1, 2002 December 1, 2001 November 1, 2001 October 1, 2001 September 1, 2001 August 1, 2001 July 1, 2001 June 1, 2001 May 1, 2001 April 1, 2001 March 1, 2001 February 1, 2001 January 1, 2001 December 1, 2000 November 1, 2000 October 1, 2000 September 1, 2000 August 1, 2000 July 1, 2000 June 1, 2000 May 1, 2000 April 1, 2000 March 1, 2000 February 1, 2000 January 1, 2000 December 1, 1999 November 1, 1999 October 1, 1999 September 1, 1999 August 1, 1999 July 1, 1999 June 1, 1999 May 1, 1999 April 1, 1999 March 1, 1999 February 1, 1999 January 1, 1999 December 1, 1998 November 1, 1998 October 1, 1998 September 1, 1998 August 1, 1998 July 1, 1998 June 1, 1998 May 1, 1998 April 1, 1998 March 1, 1998 February 1, 1998 January 1, 1998 December 1, 1997 Power Quality Archive September 1, 2002 August 1, 2002 July 1, 2002 June 1, 2002 May 1, 2002 April 1, 2002 March 1, 2002 January 1, 2002 December 1, 2001 November 1, 2001 September 1, 2001 July 1, 2001 May 1, 2001 April 1, 2001 March 1, 2001 February 1, 2001 January 1, 2001

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