Steven Owen

Articles by Steven Owen
Code Quiz: Door Stops and Cover Plates 1

Fill in the blank with the appropriate answer.

When installing metal-clad power switchgear (greater than 600V), the external hinged doors or covers must be  ___________ .

A. provided with stops to hold them in the open position

B. provided with a full-length hinge

C. lockable.

D. Provided with a viewing window

Answer: A

Code Quiz: Underground Wiring in Class I, Division 1 Locations

When installing polyvinyl chloride conduit (PVC) or reinforced thermosetting resin conduit (RTRC) as a Class I, Division 1 wiring method for an underground installation in a tank farm area, which statement is not true?

A. The conduit(s) must be installed with 24 in. of cover over the top of the concrete, which encases the conduit.

B. The conduit(s) must be covered by at least 2 in. of concrete.

C. The conduit(s) must be encased in a concrete envelope by at least 2 in. of concrete.

Code Quiz: Underground Wiring

When installing PVC conduit or RTRC as an approved wiring method in an underground installation to supply a gasoline dispensing device at a gas station, which statement is true?

Code Quiz: Duct Material Type 1

Fill in the blank with the appropriate answer.

When installing a ventilating duct in a transformer vault, per Part III of Art. 450, the duct shall be constructed of material that is ____________.

A. Acceptable to the Authority Having Jurisdiction (AHJ)

B. suitable

C. fire resistant

D. flame retardant

Answer: C

Code Quiz: Transformer Disconnecting Means 2

Fill in the blanks with the appropriate answer.

When installing a transformer (such as a 75kVA unit), the disconnecting means for this piece of equipment shall be _________, and the location of the disconnecting means shall be ______ marked on the transformer.

A. approved / properly

B. lockable / field

C. suitable / suitability

D. lockable / factory

Answer: B

Code Quiz: Instrumentation Tray Cable

Fill in the blank with the appropriate answer.

Type ITC cables (instrumentation tray cable) shall not be installed with power, lighting, or Class 1 circuits that are not power limited, or non-power-limited circuits, except ___________ .

A. where terminated within equipment or junction boxes and separations are maintained by insulating barriers or other means.

B. where a metallic sheath or armor is applied over the nonmetallic sheath of the Type ITC cable.

C. as permitted by B or C.

Answer: C

Code Quiz: Securing Requirements for MC Cable 3

Q. When installing a manufactured wiring system, which uses a 4-conductor 10 AWG MC cable, what are the securing requirements for this type of cable?

A. At intervals not to exceed 6 ft, and within 12 in of every box, cabinet, fitting, or other cable termination.

B. At intervals not to exceed 1.8 m, and within 300 mm of every box, cabinet, fitting, or other cable termination.

Code Quiz: Small Wind Systems Voltage Level

Q. Exposed non-current-carrying metal parts of small wind electric systems, such as towers, turbine nacelles, other equipment, and conductor enclosures shall be connected to an equipment grounding conductor [in accordance with 250.134 or 250.136(A)] at what voltage level?

A. All voltage levels
B. 50V or more
C. 600V or more
D. 1,000V or more

Answer: A

Code Quiz: Small Wind Systems
When grounding small wind electric systems, what is the minimum size equipment grounding conductor required to ground the guy wires that support the turbine tower?
Code Quiz: Outdoor Luminaire Location 4
When installing outdoor luminaires, you must place the fixtures below all energized conductors, transformers, or other electric utilization equipment, unless _________ .
Code Quiz 1
Fill in the blanks with the appropriate answers. Q. Where a building exceeds _______ stories, or ____ ft or more in height, overhead lines shall be arranged, where practicable to, so that a clear space (or zone) at least 6 ft wide will be left either adjacent to the buildings, or beginning not over 8 ft from them to facilitate the raising of ladders when necessary for fire fighting. Note: This relates to conductors operating at 600V or less nominal.
Code Quiz 3

Q. When are conductors permitted to be terminated based on the 90°C temperature rating and ampacity as given in Table 310.60(C)(67) through Table 310.60(C)(86)?

Code Quiz
Where in the NEC does it state, "completed wiring installations shall be free from short circuits, ground faults, or any connections to ground other than as required or permitted elsewhere in the Code?”
Code Quiz
In a Class I Division 2 location, when is it permissible to omit the normally required bonding jumper (of the wire type in compliance with 250.102) for liquidtight flexible metal conduit?
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