1 Flashcards
If a circuit with 2 resistance loads in series what can be determine if the flowing the current flow through 1 resistance is known
Total circuit amperage
On a balanced 3 phase WYE circuit how much return current will you have on the neutral
None
A switch cabinet is rated at 600A.
Switch carry a maximum of 600A
What is a circular mil
A unit of measure ment of cross section area
The tape shielding on rubber cable can be used as a neutral
No
A bad B contatact will make realy inoperable
No because it does not have to do with realy
Function of b realy
Only indicator light in the monitoring system
Purpose of oil in iso box
Insulate
How is a thickness of insulation on a wire calculated
Insulation diameter minus the conductor
When making a tape splice or repair How thick was the stress cone Be at it thick his point
Twice the thickness of insulation
Parallel circuit
More then one path for current to flow
Current is the transfer of what
Of one atom to another
Measurement of resistance in a circuit
Ohms
What causes a magnetic field to form around a conductor
Current flowing through a conductor
Amount of current determines what of a conductor
The size of conductor needed
Watts is produced by what
Volts and amp
What must be done before cutting primary cable
De-energized, test, grounded at both ends and spiked
Cts are used to reduce current for what
Metering
Ct is part of what in the protector
Trip circuit
What should be removed first on OH transformer
The secondary bushing so backfeed is not sent into transforme and cause high voltage thru primary bushing
How to balance coils in shopping mall style protector
Shorten the coils or the relay should be blocked
CLOR
Close, light, open ,reset
Network protectors disgen to protect the system from what faults
Primary and transformer
Typical generated voltages are
4kv,14kv,19,kv,21kv,
Typical system primary voltage
2400/4160
7620/13200
14400/24940
