Low Voltage & Power Limited Systems
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Think you have a handle on low voltage and power limited systems? Test your knowledge of rules governing the installations and upgrades of these systems.
- 1.Electrical metal tubing must be threaded when used in high-hazard locations.
- A.
True
- B.
False
- 2.EMT must be securely fastened within ____ feet of every box, cabinet or termination fitting, and at intervals not exceeding ____ feet.
- A.
5 / 10
- B.
3 / 5
- C.
1 / 5
- D.
3 / 10
- 3.EMT may be used as the sole support for cameras mounted outside when boxes are attached
- A.
True
- B.
False
- 4.EMT installed horizontally in holes bored or punched in wood or metal framing members, or in notches in wooden members, is not considered supported.
- A.
True
- B.
False
- 5.The maximum distance between pull points is ____.
- A.
50 feet
- B.
100 feet
- C.
The length of the available snake
- D.
Not applicable. The code specifies no maximum distance
- 6.To protect wire from abrasion, bushings are required by a fitting that provides a smooth, rounded insulating surface for all wires ____ AWG and smaller.
- A.
6
- B.
10
- C.
16
- D.
18
- E.
All wires of all sizes require such a bushing
- 7.Boxes or other enclosures are required for Class 2 and Class 3 splices, or terminations.
- A.
True
- B.
False
- 8.Under a roadway, buried nonmetallic raceways must be buried at least ____.
- A.
6 in.
- B.
18 in.
- C.
2 ft.
- D.
6 ft.
- 9.Separation of ____ is required between Class 2 or Class 3 circuits and between raceways or cables containing power conductors.
- A.
1/4 in.
- B.
1/2 in.
- C.
2 in.
- D.
Not applicable. No separation is required.
- 10.Class 2 cables must not be supported by a raceway unless ____.
- A.
The raceway is rigid metal conduit
- B.
The raceway provides power to the equipment controlled by the Class 2 cable
- C.
Plenum wire ties are used at intervals of 18 inches or less
- D.
Not applicable. No exception exists
- 11.Optical fiber cables not terminated at equipment and not identified for future use with a tag ____.
- A.
Are considered abandoned and must be removed
- B.
Pose no hazard because they carry no current
- C.
Can be “toned out” at a future date for use
- D.
May be left in place only in industrial applications
- 12.Which of the following is not permitted?
- A.
Cables may be supported by the structural components of the building.
- B.
Raceways and cables may be supported by independent support wires attached to the suspended ceiling.
- C.
Cables may be attached to the support wire of a suspended ceiling.
- D.
Cables may be secured by straps, staples, hangers or similar fittings, as long as they are designed not to damage the cable.
- 13.Unless protected by a steel plate, cables cannot be closer than ____ from the edge of framing membersor furring strips.
- A.
1/2 in.
- B.
1 in.
- C.
1 1/4 in.
- D.
1 1/2 in.
- 14.Working spaces for equipment operating at not more than 30VAC or 60VAC can be smaller than the distance specified in Table 110.26.
- A.
True
- B.
False
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