Cable Tray
MLO and MCC
What is main lug only and motor control center
Component used to join two straight sections of cable tray
What is a splice plate
Lost strands reduces this.
What is cross sectional area at termination
Wire range for blue terminals
What is 16 to 14 AWG
When unpractical to protect spliced joint by and other means, what is acceptable
What is electrical tape
Multiplier for #4/0 or larger cables in combination cable trays
What is 1.2
Formula for calculating cable tray support
What is full weight of tray and cable / total linear feet
May initially pass acceptance testing but often fails prematurly
What is damaged cable
NEC Section for wire bending space at terminals
What is 312.6(A)
Recommended location for splice plates
At the point of least stress or withing 24" of a support
NEC section covering cables used in cable tray with rating of 2000v or less.
What is 392.80
NEC Section that covers solid bottom cable tray
What is 392.22(A)(3) (a) thru (c)
Minimum bend radius for wire and cables
What is 3X OD unless specified by cable manufacturer
Must be measured in a straight line
What is bending space at terminals
Two types of failure in a cable tray system
Longitudinal and transverse
Referred to as a solid bottom cable tray
Failures that typically appear as bending or buckling of the side rail
What is longitudinal
This happens if wrong die size is usede
Electrical and mechanical properties are diminished
3 types of radius per NEC 330.34
Smooth sheath, Interlocked corrugated sheath and shielded conductors
Location where the majority of electrical failures occur
What are the terminations
Cable tray minimum width for 3 cables at 1.5", 4 cables at 1.75" and 4 cables at 2.5" diameter. All smaller than #4/0
What is 30"
Diameter squared times pi divided by 4
What is the cross sectional area
NEC Section covering clearance for cable maintenance and instation
What is 392.18(F)
Compression type connector wire size made to accept one size conductor only
What is #8 or larger
Name all four types of wire stripping for large conductors
End, window, spiral, circumferential and longitudinal