Code Quiz
Jun 27, 2007, By Steven Owen
When installing a high-impedance grounded neutral system, for a 480V, 3-phase system, the following question has arisen. Which of the following choices best describes the proper routing for the grounded conductor of the system?...
Code Quiz
Jun 13, 2007, By Steven Owen
When installing a high-impedance grounded neutral system for a 480V, 3-phase electrical system, the following question arises. Where is the proper location for the grounding impedance (resistor)?...
Code Quiz
May 29, 2007, By Steven Owen
What is the minimum size and metal thickness required for a junction box constructed of sheet steel, with one 4-inch RMC conduit (per wall) connected on opposite walls of the box (i.e., directly across from one another)?...
Code Quiz
Nov 27, 2006, By Steven Owen
In a Class 1 location of a spray application (Art. 516) area, portable equipment such as portable electric lamps or other utilization equipment shall be permitted in which of the following situations?...
Code Quiz
Nov 13, 2006, By Steven Owen
The wiring of the emergency system in hospitals shall be mechanically protected. Where installed as branch circuits in patient care areas, the installation shall comply with the requirements of 517.13(A) and 517.13(B). Which of the following wiring methods is permitted?...
Code Quiz
Oct 25, 2006, By Steven Owen
What is the proper size overload, and branch-circuit, short-circuit, ground-fault protective device permitted for a hermetic compressor with a nameplate rated-load of 38A, and a branch-circuit selection current of 40A?...
Code Quiz
Oct 11, 2006, By Steven Owen
What is the proper size branch-circuit, short-circuit, ground-fault protective device required for a hermetic compressor with a nameplate rated load of 38A?...
Code Quiz
Sep 25, 2006, By Steven Owen
What is the minimum size XHHW insulated feeder conductor permitted for an industrial machine, which consists of the following loads? All terminals are rated at 75°C....
Code Quiz
Sep 8, 2006, By Steven Owen
What is the maximum allowable ampacity of 12 AWG THHN insulated conductors installed in a strut-type channel raceway that is 1½ inches by 1½ inches?...
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...
