Question 1
What is the primary purpose of a junction box in a branch circuit?
Question 2
Before starting work on a live electrical panel, what is the FIRST step an apprentice should take according to basic safety practice?
Question 3
Which component is strictly used to disconnect the ungrounded conductors of a circuit from their supply source?
Question 4
A 600V feeder requires a disconnect. You install a fused disconnect switch. What must be checked regarding the switch's rating?
Question 5
Which component is used to disconnect the ungrounded conductors of a circuit from their supply source?
Question 6
What is a key reason to use a disconnecting means within sight of a motor?
Question 7
Before working on a piece of equipment, which step should be done immediately after opening the disconnecting means?
Question 8
In a typical residential service, where is the main service disconnect most commonly located?
Question 9
Which device is typically used to quickly disconnect all power to a piece of fixed equipment for servicing?
Question 10
Where should the service disconnecting means for a building normally be located according to US practice?
Question 11
What is the typical purpose of a disconnect switch installed next to an air-conditioning condenser unit outside a home?
Question 12
A 4-wire multiwire branch circuit shares a neutral between two 120 V circuits on opposite legs of a 120/240 V system. What is one key safety requirement for disconnecting means on this circuit?
Question 13
In a small commercial building with multiple panels, what is the best practice regarding the main service disconnecting means?
Question 14
Which device is specifically designed to open a circuit automatically when current exceeds its rating for a period of time?
Question 15
A motor disconnecting means is required to be within sight of the motor. What is the main reason for this requirement?
Question 16
A journeyperson is installing a disconnect switch near a large motor. What is the NEC requirement regarding the location of the disconnecting means?
Question 17
Before replacing a motor starter in an industrial panel, what is the FIRST step the electrician should take according to safe lockout/tagout practices?
Question 18
A multiwire branch circuit uses two ungrounded conductors that share a neutral. Which requirement is critical for the disconnecting means?