NCCER Electrical Level 2 Module 7-Solved
Cable tray standard lengths - ANSWER-12' and 24'
Cable tray common widths - ANSWER-6" - 36"
Cable tray depths - ANSWER-3" - 6"
Type of tray that is lightweight and easily cut - ANSWER-Basket tray
Who determines density fill? - ANSWER-The person laying out the system
A point of weakness in cable tray systems are found where? - ANSWER-At a splice
point
Where should a splice be located? - ANSWER-Within 1/4 of the span from the
support ideally
How are cables placed in a tray? - ANSWER-Laid in over the side or pulled along the
tray
What is used to change the elevation in a run of cable tray - ANSWER-Vertical
adjustment splice plate
What is used to build an offset in a cable trey system? - ANSWER-Swivel plates
5 types of cable tray support - ANSWER-Trapeze
Direct Rod
Wall Mounting
Center hung support
Pipe rack
Tray type used for light-duty applications like sound, telephone, and other
communication systems? - ANSWER-Center rail (aka monorail)
Electrical conductors must not be installed in cable tray systems with? - ANSWER-
Steam, water, gas, air, or drainage pipes
How should long runs of cable be pulled? - ANSWER-In one continuous operation at
a speed of 20' - 25' per minute.
How are closely packed cables affected when energized? - ANSWER-Efficiency is
decreased
Cable supports should be capable of supporting how many times the full weight of
the cable and tray? - ANSWER-1.25 times
Cable tray standard lengths - ANSWER-12' and 24'
Cable tray common widths - ANSWER-6" - 36"
Cable tray depths - ANSWER-3" - 6"
Type of tray that is lightweight and easily cut - ANSWER-Basket tray
Who determines density fill? - ANSWER-The person laying out the system
A point of weakness in cable tray systems are found where? - ANSWER-At a splice
point
Where should a splice be located? - ANSWER-Within 1/4 of the span from the
support ideally
How are cables placed in a tray? - ANSWER-Laid in over the side or pulled along the
tray
What is used to change the elevation in a run of cable tray - ANSWER-Vertical
adjustment splice plate
What is used to build an offset in a cable trey system? - ANSWER-Swivel plates
5 types of cable tray support - ANSWER-Trapeze
Direct Rod
Wall Mounting
Center hung support
Pipe rack
Tray type used for light-duty applications like sound, telephone, and other
communication systems? - ANSWER-Center rail (aka monorail)
Electrical conductors must not be installed in cable tray systems with? - ANSWER-
Steam, water, gas, air, or drainage pipes
How should long runs of cable be pulled? - ANSWER-In one continuous operation at
a speed of 20' - 25' per minute.
How are closely packed cables affected when energized? - ANSWER-Efficiency is
decreased
Cable supports should be capable of supporting how many times the full weight of
the cable and tray? - ANSWER-1.25 times
