cable types Flashcards
Unshielded cable use is normally limited to ?
7.2kV
Cable with impregnated-paper insulation has a ? sheath.
lead
Rank the conductors by size, from smallest to largest.
6 awg < 4/0 awg < 500 kcmil
Strand shielding is made from ? materials.
semiconducting
Large power cables use ? , which makes the cable flexible.
stranded conductors
Copper conductors have a higher conductivity than aluminum.
true
Aluminum conductors can be damaged by ? when touching other metals in the presence of water.
galvanic action
Annular conductors are used for larger size cables to increase skin effect.
false
Three of the most common materials used as insulation for power cables are taped insulation, thermoplastics, and ?
rubber
Voltage, current, and ambient temperature are three factors used to determine the type of cable insulation for a specific use.
true
With regard to cable jacketing, the letters PVC stand for Pre-varnished Cambric.
false
Varnished-cambric insulated cable normally has a ? sheath.
lead
Bedding tapes are used in cables to add mechanical strength.
true
Cable sheaths cannot be made from metallic materials.
false
Ampacity is the amount of voltage that a conductor can carry without exceeding an acceptable temperature rise.
false
