Exam (elaborations)
IMSA Traffic Signal Inspector Chapter 4 - Conduit & Cable Questions and Answers
- Course
- Institution
IMSA Traffic Signal Inspector Chapter 4 - Conduit & Cable Questions and Answers
[Show more]
Content preview
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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller LUCKYSTAR2022. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
76462 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now