ETC Electrical & Electronic Systems Flashcards
6 cards from real ETC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 ETC Electrical & Electronic Systems flashcards as text
What is the minimum burial depth for rigid metal conduit under a sidewalk per the NEC?
Answer: 12 inches
The NEC generally requires a minimum 12-inch burial depth for rigid metal conduit beneath a sidewalk in residential applications.
Which electrical system configuration uses four wires consisting of three phase conductors and one neutral?
Answer: Wye (Y) configuration
A wye configuration connects one end of each phase winding to a common neutral point, yielding three hot wires plus a neutral.
What is the primary purpose of bonding in an electrical system?
Answer: To create a low-impedance path for fault current
Bonding connects metal parts of an electrical system to ensure a low-impedance return path so overcurrent devices can operate during a fault.
A clamp-on ammeter measures current without breaking the circuit by sensing which physical phenomenon?
Answer: Magnetic field around the conductor
A clamp-on ammeter clamps around a conductor and measures the magnetic field produced by current flow using Hall effect or transformer principles.
What voltage level does OSHA define as high voltage for electrical safety purposes?
Answer: Over 600 V
OSHA defines high voltage as exceeding 600 V, which triggers additional safety requirements for qualified workers.
In conduit fill calculations, what is the maximum fill percentage for three or more conductors per the NEC?
Answer: 40%
The NEC limits conduit fill to 40% of the conduit cross-sectional area when three or more conductors are installed.