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IMSA Traffic Signal Inspector Chapter 4 - Conduit & Cable Questions and Answers
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IMSA Traffic Signal Inspector Chapter 4 - Conduit & Cable Questions and Answers
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IMSA Traffic Signal Inspector Chapter 4 -Conduit & Cable Questions and Answers
Signal Phasing - ANS-Method by which a traffic signal system accommodates various users at an intersection safely and efficiently.
PVC - ANS-Poly Vinyl Chloride
HDPE - ANS-High Density Polyethelene
RMC - ANS-Rigid Metallic Conduit
RNMC - ANS-Rigid Nonmetallic Conduit
Sizes of PVC used in signal work - ANS-2" to 4"
RMC sizes used in signal applications - ANS-1 to 2"
RPVC sizes available - ANS-1/2" to 6"
Conduit size used for interconnect cable - ANS-2"
Maximum fill for conduit carrying 3 or more conductors - ANS-40%
Reasons to use larger conduit - ANS-1. 40% fill limitation
2. Ease of pulling conductors in
3. Larger bend radii for fiber optic applications
Maximum conduit fill for conduit carrying 2 conductors - ANS-31%
Maximum conduit fill for conductors carrying 1 conductor - ANS-53%
How to calculate conduit fill - ANS-1. Get cross sectional area of conductor
2. Check chart from NEC
Required markings on PVC - ANS-1. Manufacturer's name
2. Size
3. Rating
at intervals of no greater than 10 LF
NEC requirements for bushings - ANS-Requires a bushing at the end of a conduit or raceway that emerge from direct burial. NEC permits omission of bushing if J.Box provides equivalent protection. Maximum number of bends PVC - ANS-NEC requires number of bends in a run of PVC conduit not to exceed 360 degrees.
Minimum burial depth under streets, driveways and parking lots. PVC - ANS-24" to top of conduit per NEC
Minimum burial depth under areas not subject to vehicular traffic. PVC - ANS-18" to top of conduit per NEC. in trench under slab, may be reduced to 12 inches.
Minimum burial depth under railroad tracks - ANS-50" to top of conduit
Avoid PVC in areas - ANS-In areas exposed to direct sunlight
in areas subject to mechanical damage
NEC depth requirement for PVC under ditches - ANS-18" depth below ditches
When to use schedule 80 PVC - ANS-Under roadways
Why should schedule sized of conduit not be mixed - ANS-Inner coupling step will shave insulation off conductors as they are being pulled
Limitations of HDPE - ANS-1. Low melting point
2. low mechanical protection
3. not sunlight resistant
RMC size designations - ANS-1/2" to 6"
Why do signal installations use larger conduit - ANS-Collection of cables arriving at the cabinet
Electrical taper for threading dies - ANS-1 in 16 taper
Failure to bond RMC results in - ANS-1. shock hazards
2. fires from high resistance contacts
RMC vertical support requirements - ANS-1. within three feet of each junction box
2. within 5 feet where three is not feasable
1/2" - 10LF
1" - 12LF
2" - 16LF
3" + - 20 LF
Max bends RMC - ANS-360 degrees
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