Code Quiz
Aug 28, 2006, By Steven Owen
When installing a new service for a separate building constructed on the top floor of a parking garage, it has been determined that the service conductors will have to be installed in rigid metal conduit (RMC) starting in the vault below grade of the first floor level of the parking garage...
Code Quiz
Aug 14, 2006, By Steven Owen
What is the maximum number of 12 AWG THHN insulated conductors permitted in a strut-type channel raceway that is 1½ inches by 1½ inches and of unlimited length?...
Code Quiz
Jul 25, 2006, By Steven Owen
What is the minimum size NM cable required for an electric space-heating branch circuit installed 3 inches above a heated ceiling (with no thermal insulation) in a dwelling unit?...
Code Quiz
Jul 11, 2006, By Steven Owen
When installing electric heat-tracing cables and heating panels in industrial installations (where ground fault alarm indication is provided and the operation cannot tolerate a ground fault condition that would normally open the circuit overcurrent device)...
Code Quiz
Jun 20, 2006, By Steven Owen
What is the minimum acceptable voltage at a fire pump motor’s terminals, when the 460V-rated motor is supplied with an operating voltage of 480V, and the motor is operating at 115% of the full-load current rating of the motor?...
Code Quiz
Jun 12, 2006, By Steven Owen
When installing wiring from a fire pump controller to a fire pump motor, which of the following wiring methods is not permitted?...
Code Quiz
May 24, 2006, By Steven Owen
An existing corporate data center is concerned about possible loss of power due to the fact that it is supplied by only one service. The existing feed consists of a 1600A, 208Y/120V, 3-phase, four-wire service. Data center management personnel propose to add an additional service....
Code Quiz
May 11, 2006, By Steven Owen
According to 110.16, certain information is required on the label when marking switchboards, panelboards, industrial control panels, meter socket enclosures, and motor control centers....
Code Quiz
Apr 24, 2006, By Steven Owen
Excluding exceptions, what is the requirement for cabling work space, which includes a requirement for a clear work space not less than...
Code Quiz
Apr 11, 2006, By Steven Owen
What is the minimum number of 20A branch circuits required for a guest suite of a hotel or motel, which consists of the following...
Code Quiz
Mar 26, 2006, By Steven Owen
Disregarding the Exceptions in 225.32, when are you not required to install a disconnecting means for a building or structure at the building or structure?...
Code Quiz Correction
Mar 12, 2006, By Steven Owen
The answer to the question below, shown in the March 13 issue of CodeWatch, was incorrectly shown as: A) fire alarm systems. In retrospect, I should have added a fifth option, which read as follows: E) none of the above. This would be the correct answer in this case....
Code Quiz
Feb 26, 2006, By Steven Owen
With respect to a solar photovoltaic system, a disconnecting means is required to disconnect all current-carrying conductors of a photovoltaic power source from all other conductors in a building or other structure. A switch or circuit breaker shall not be installed in a grounded conductor unless...
Code Quiz
Feb 11, 2006, By Steven Owen
What is the maximum number of overcurrent devices permitted in a lighting and appliance branch-circuit panelboard? What is the maximum number of overcurrent devices permitted in a power distribution unit (PDU) of an information technology system?...
Code Quiz
Jan 25, 2006, By Steven Owen
When installing a grid structure at a dwelling unit swimming pool, the equipotential bonding grid shall cover the contour of the pool and the pool deck...
Code Quiz
Jan 10, 2006, By Steven Owen
An equipotential plane installed at a catfish farm pond is required for the service equipment installed outdoors (adjacent to the pond), where the service equipment controls equipment is installed in and adjacent to the water....
Code Quiz
Dec 22, 2005, By Steven Owen
What is the minimum circuit ampacity and minimum size conductor required for the feeder conductors supplying the following group of electric arc welders?...
Code Quiz
Dec 8, 2005, By Steven Owen
When grounding a large bridge crane in an industrial facility, such as a paper mill or steel mill (or any other location), which of the following statements is correct?...
Code Quiz
Nov 18, 2005, By Steven Owen
What is the maximum number of multi-conductor cables (for control circuits only) permitted in an 18-inch wide by 4-inch deep ladder type cable tray?...
Code Quiz
Nov 7, 2005, By Steven Owen
What is the minimum cable tray width required for an installation that consists of six sets of 1,000 kcmil conductors (rated 600V) bundled in six sets of three-each conductors in an uncovered ladder type tray?...
Code Quiz
Oct 24, 2005, By Steven Owen
When grounding branch circuits – with respect to grounding requirements for receptacles and fixed equipment – in patient care areas of hospitals (critical care or general care areas), which of the following statements is correct?...
Code Quiz
Oct 7, 2005, By Steven Owen
A small strip mall consists of the following 10 tenants: a pharmacy; a 24-hour emergency medical treatment center, which provides a limited amount of critical care; and eight different retail shops. The common service disconnecting means for the entire group of tenants is equipped with ground-fault protection (one service and 10 feeders)...
