Journeyman Electrician's Grounding and Bonding Flashcards
7 cards from real Journeyman Electrician’s Exam practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Journeyman Electrician's Grounding and Bonding flashcards as text
Metal gas piping in a building must be bonded per NEC 250.104(B) to which of the following?
Answer: The equipment grounding conductor of the circuit likely to energize the piping
Per NEC 250.104(B), interior metal gas piping must be bonded to the equipment grounding conductor of the circuit that is most likely to energize the piping.
What is the maximum size copper equipment grounding conductor that may be bare (uninsulated) when installed in a raceway?
Answer: Any size may be bare in a raceway
Per NEC 250.119, equipment grounding conductors of any size may be bare, covered, or insulated when installed in a raceway.
A patient care area in a hospital requires what type of grounding system per NEC 517?
Answer: An isolated (ungrounded) power system with a line isolation monitor
NEC Article 517 requires critical care areas to use an isolated (ungrounded) power system with a line isolation monitor to allow the circuit to continue operating during a first fault.
Which of the following correctly describes the difference between grounding and bonding?
Answer: Grounding connects equipment to earth; bonding connects conductive parts to each other
Grounding connects the electrical system to earth (the grounding electrode system), while bonding connects conductive parts together to ensure electrical continuity.
When a panelboard is used as service equipment, the equipment grounding terminal bar must be bonded to the enclosure using a:
Answer: Main bonding jumper
At service equipment, the main bonding jumper connects the neutral (grounded conductor) terminal bar to the equipment enclosure and the EGC terminal bar.
What NEC rule applies to the grounding electrode conductor at the point it connects to a water pipe electrode?
Answer: The connection must be accessible and made with a listed clamp
Per NEC 250.70, connections to grounding electrodes must be made with listed fittings, and connections to pipe electrodes must be accessible and made with listed clamps.
An equipment grounding conductor run with circuit conductors in a conduit system primarily protects against:
Answer: Electric shock from a ground fault on equipment
The EGC provides a low-impedance path for fault current to return to the source, causing the overcurrent device to open and protect against electric shock from faulted equipment.