Book #4 Flashcards
What type of disconnecting means is acceptable for a portable cord-connected 4kw, 240v electric space heater?
Cord and attachment plug
On what set of drawings do you find information on HVAC layout?
Mechanical
When removing the meter from an enclosure that uses current transformers in the metering circuit, which wiring safety practice is preformed to the current transformers?
Short the secondary
On what type of drawing would you find information on the connecting of PLC components?
Schematic
What is the phase relationship between current and voltage in a pure capacitive cct
Voltage lags current by 90 degrees
Where is the toxicity information located in an industrial establishment
Material Safety Data Sheet
Where are separately derived electrical systems grounded?
At the first switch controlling the system
Why is Hi-Potting done before a high voltage installation is energized
Confirm integrity of cable insulation
What fault is caused by a solid connection between two phases
Bolted Fault
Which measuring device to do an insulation resistance test on a cable
Megger
An ungrounded delta fed piece of equipment’s ground detection lights would illuminate what condition if no phases are grounded?
All three lights are on
What term refers to the ionization of air around high voltage cables?
Corona
How is the dielectric test done on a capacitor?
Between the two leads
How many lighting circuits can a DPDT type switch control?
2
How do you reverse a shaded pole motor?
Take the motor apart and rotate the rotor shaft end for end
