Journeyman Electrician's Panelboards and Switchboards 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 Panelboards and Switchboards flashcards as text
Per NEC 110.26(F)(1), the dedicated electrical space above a panelboard extends from the top of the equipment to a height of:
Answer: 6 feet above the equipment or to the structural ceiling, whichever is lower
NEC 110.26(F)(1) requires the dedicated electrical space to extend from the floor to 6 feet above the equipment or to the structural ceiling, whichever is lower.
Which NEC article primarily governs the installation of switchboards, switchgear, and panelboards?
Answer: Article 408
NEC Article 408 specifically covers switchboards, switchgear, and panelboards including their construction, installation, and overcurrent protection requirements.
Per NEC 408.40, equipment grounding conductors must terminate within a panelboard on:
Answer: The equipment grounding terminal bar
NEC 408.40 requires equipment grounding conductors to terminate on the equipment grounding terminal bar provided in the panelboard.
When a panelboard serves as service equipment, the neutral conductor must be bonded to the equipment grounding terminal bar via:
Answer: A main bonding jumper
Per NEC 250.24(B) and 408.40, when a panelboard serves as service equipment, a main bonding jumper is installed to bond the neutral to the equipment grounding terminal.
Per NEC 230.70(A), the service disconnecting means for a building must be installed:
Answer: At a readily accessible location either outside or inside nearest the point of entrance of the service conductors
NEC 230.70(A) requires the service disconnect to be at a readily accessible location outside or inside the building nearest the point where the service conductors enter.
What is the maximum number of disconnects permitted for a single service per NEC 230.71?
Answer: Six disconnects
NEC 230.71 permits a maximum of six switches or circuit breakers as the service disconnecting means, commonly called the 'six-handle rule.'
A switchboard differs from a panelboard primarily in that switchboards are:
Answer: Large single or multi-section assemblies accessible from the front and often the rear
Switchboards are large assemblies, typically floor-standing and accessible from the front and rear, while panelboards are smaller, wall-mounted enclosures accessible from the front only.