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5-Minute Tech Quiz

What Do You Know About Wiring Methods?

By Roy Pollack
5 min quiz 2019
January 6, 2020

What Do You Know About Wiring Methods?

All Answers relate to NFPA 70, 2017 Edition

1. A Western Union soldered splice is the only permitted splice to be installed within a raceway.
A. True
B. False
300.13(A), 376.(A)
2. Class 2 and 3 cables ___________ supported by the raceway that supplies power to the equipment controlled by the Class 2 or 3 circuit.
A. must be
B. can be
C. can not be
D. must be independent
300.11
3. There must be at least 6 inches of free conductors at boxes with openings and at least 3 inches of free conductors outside the box except when the __________.
A. box is square
B. gauge of the wire exceeds 12AWG
C. opening of the box is greater than 8 inches
D. cross sectional area of the box exceeds 6 inches
300.14
4. There must be at least 6 inches of free conductors at boxes with openings and at least 3 inches of free conductors outside the box except when the conductors __________.
A. are not to be spliced.
B. are to be soldered.
C. are to be terminated within the enclosure
D. exceed 12AWG
300.14
5. Splices and taps are not permitted to be installed within a conduit body.
A. True
B. False
314.16(C)(2)
6. A _________ shall be installed at each outlet and switch point for concealed knob-and-tub wiring.
A. junction
B. mud ring
C. conduit body
D. box
300.15
7. The installation of conductors in boxes and conduit bodies shall comply with 
A. 300.15
B. 394.1(A) through (E)
C. 314.17(B)(1) through (B)(4)
D. 250.50
314.17
8. When is a fitting permitted in lieu of a box?
A. When the fitting is listed for such use. 
B. When the conductors are not spliced or terminated within the fitting.
C. When the fitting is identified for the use and conductors are not spliced or terminated within the fitting.
D. At no time is a fitting permitted to be used in lieu of a box.
300.15(F)
9. A raceway used for the support or protection of cables shall not be required  to have a ________ but must have _______ to reduce the potential for abrasion.
A. box / a fitting
B. fitting / a box
C. bushing / a box
D. enclosure / the raceway reamed
300.15. (C)
10. When can an enclosure be used as a raceway?
A. Never
B. When the conductor fill doesn’t exceed 53%.
C. When splices do not exceed 85%.
D. When the conductor fill doesn’t exceed 40% and splices do not exceed 75%.
300.15(I)
11. Conductor fill of a raceway can not exceed:
A. 1 conductor 53%, 2 conductors 31%, 3 or more conductors 25%
B. 1 conductor 54%, 2 conductors 31%, 3 or more conductors 40%
C. 1 conductor 53%, 2 conductors 31%, 3 or more conductors 40%
D. 1 conductor 50%, 2 conductors 30%, 3 or more conductors 40%
Chapter 9 Table 1
SUBMIT
Thank you!
Your score is

 

 

 

Bonus Question

Review the attached photo. Can you identify any problems (maybe none) and determine which code section applies?

IMG_0569

Click here to see the answer.

Answer to: Bonus Question

300.11(C) Raceways Used as Means of Support Raceways shall be used only as a means of support for other raceway, cables or nonelectrical equipment under any of the following conditions:

(1) Where the raceway or means of support is identified as a means of support.

(2) Where the raceway contains power supply conductors for electrically controlled equipment and is used to support Class 2 circuit conductors or cables that are solely for the purpose of connection to the equipment control circuits.

(3) Where the raceway is used to support boxes or conduit bodies in accordance with 314.23 or to support luminaires in accordance with 410.36(E).

 

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KEYWORDS: installation security systems standards wiring methods

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Roy Pollack, CPP, SET, holds Level IV certification in the field of fire alarms from NICET is currently the director of Compliance for Devcon Security Services Corp., Hollywood, Fla., and may be reached at sdmtechtips@bnpmedia.com.

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