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Code and Pract ch 4
Introduction to cable tray systems
| Question | Answer |
|---|---|
| 1. A cable tray system is defined as a system of raceways and associated fittings used to securely fasten or support cables. T/F | False |
| 2. Cable tray materials include ___. (aluminum, stainless steel, pre-galvanized steel, hot-dip galvanized steel, all of the above) | all of the above |
| 3. ___ specifies the requirements for fiberglass cable trays and associated fittings designed for use in accordance with the requirements of the NEC | NEMA FG1 |
| 4 A __ is a prefabricated metal structure consisting of two longitudinal side rails connected by individual transverse members | ladder cable tray |
| 5. Cable trays containing conductors rated over 600 volts must have a permanent, legible warning notice carrying the wording "DANGER-HIGH VOLTAGE-KEEP AWAY" placed in a readily visible position on all cable trays. T/F | True |
| 6. A cable tray having openings on the bottom sufficient for the passage of air and utilizing 75% or less of the plan area of the surface to support cables is known as a ___ | ventalized cable tray |
| 7. Covers for cable trays should generally be installed __ (in a vertical tray run accessible by pedestrian & vehicular traffic, where falling objects may damage cables, outdoors, all) | A, & B |
| 8. Each cable tray fitting must be marked with which of the following ( manufacturer's name or trademark, type of material, "WARNING DO NOT USE AS A WALKWAY, LADDER,OR SUPPORT FOR PERSONNEL. USE ONLY AS A MECHANICAL SUPPORT FOR CABLES...., or none | A, B , & C |
| 9. NEMA VE 2 addresses which of the following (handling, load capacity, maintenance, modification, shipping, storing) | all except not load capacity |
| 10. Lengths of straight sections of cable tray are generally manufactred in which of the following lengths (10', 12',20',24',25') | 12' & 24' |
| 11. Aluminum is often the material of choice for cable tray installations because it __ (is corrosion resistant in certain environmnents, is lightweight, has a high strength-to-weight ratio, is maintenance free, is nonmagnetic) | all |
| 12. fittings are subject to NEMA/CSA load ratings T/F | False |
| 13. Pre-galvanizing is the most widely used coating for steel cable tray. T/F | False |
| 14. If a cable tray system will be subjected to thermal expansion and contraction, expansion splice plates must be considered during the installation T/F | True |
| 15. Deflection of non-metallic cable tray can be adversely affected by ___ | elevated temperatures |
| 16. Support locations of cable tray straight in a continuous run should follow the __ rule. (1/4, 1/3, 1/2, 1/1) | 1/4 |
| 17. NEMA VE 1 provides which of the following for metal trays and associated fittings ( Electrical continuity of connections, Length, Load capacity, Maintenance, Rung spacing, Width) | all but no Maintenance |
| 18. A prefabricated metal structure consisting of a one-piece ventilate bottom or solid bottom channel section, or both, not exceeding six inches in width best describes a ___ | channel cable tray |
| 19. What is meant by a NEMA 12A load/span class designation | if it is 2 span A it means you must support every 12 feet. |
| 20. Fiel modifications, such as cut ends, made on hotdipped galvanized cable tray that is being used outdoors will require touch-up T/F | True |
| 21. The inside radius of a fitting used to change the direction, either horizontal or vertical, can be __ (12",24"36"48", any of above) | any of the above |
| 22. NEC 392.60 permits steel and aluminum cable tray to be used as an equipment grounding conductor as long as __(multiple choice | all of above |
| 23. A bare copper electrical grounding conductor cable can be used in or on aluminum cable tray | False |
| 24. When cables rated 600 volts or less are installed in the same tray with cable rated over 600 volts, a ___ must be installed to separate the cables, unless the cables rated over 600 volts are Type MC (multiple choice | solid fixed barrier of a material compatible with the cable tray |
| 25. Identify the document that provides detailed information for drilling holes for the installation of splice plates in field-cut cable tray (NEC, NEMA FG1, NEMA VE1, NEMA VE2 | NEMA VE 2 |
| 26.Identify the document that provides suggested support locations for cable tray fittings (NEC, NEMA FG1, NEMA VE1, NEMA VE2) | NEMA VE 1 |
| 27. Supports for cable tray systems must provide strength and working load capabilities sufficient to meet the load requirement of the cable tray wiring system including loads associated with ___ ( ice, snow, the addition of cables in the future, wind) | ice, snow, the addition of cables in the future, wind |
| 28. The total difference between the minimum winter and maximum summer temperatures a cable tray system may be subject to must be considered to account for thermal expansion and contraction. T/F | True |
| 29.Identify the type of splice plate that must be used to account for thermal expansion and contraction of a cable tray system. (adjustable, expansion, offset reducing, step-down) | Expansion |
| 30. Identify the NEC sections where uses permitted and uses not permitted are addressed ( 392.1 an 392.2; 392.10 and 392.12; 392.18 and 392.20; 392.22 and 392.30) | 392.10 and 392.12) |
Created by:
JoshHampton