Code Flashcards
Stuff I can't seem to remember
Where in the code book would you locate the enclosure type required for non-hazardous locations?
Table 65
What is the relationship between the opening time of an overcurrent device and the magnitude of ground fault current?
Inversely proportional. Higher current will cause device to operate more quickly.
Grounding functions to stabilize the _____ during normal operations by providing a _____.
Voltage-to-ground.
Common reference point.
System bonding jumper size is based on the rating of _____.
The overcurrent device protecting the ungrounded conductors.
Table for selecting conductor size for concrete encased electrode.
Table 43
A fuse’s interrupting rating indicates it’s capability to safely open a circuit during a short circuit condition, true or false.
True. Rating correlates with possible fault current delivered from the source.
A fuse rated for up to 60 amps is usually of _____ type construction
Barrel
Fuses 70 - 600A are of a _____ type.
Blade
How does a trip-free breaker work?
It will trip under short circuit conditions even if holding the handle “on” (closed).
A class A GFCI opens a circuit under what conditions?
If the leakage current is 6mA (0.006) or more
What type of utility system is common in downtown core areas? How does that system operate?
Network system. Transformers are connected parallel on secondary.
What is the conventional type of utility system?
Radial system.
If the ungrounded circuit conductor touches the grounded circuit conductor on the load side of the receptacle, will the GFCI receptacle open the circuit?
Yes
Should the secondary of a current transformer be fused?
No - OC protection is not required and the secondary must not be fused due to the possible high voltage induced by opening the circuit.
