TL;DR
Study the assessment and management of eye, ear, nose, throat, and facial emergencies. These specialized assessments require specific knowledge tested on the Master Electrician License Exam.
Free Service Equipment Requirements Practice Questions
Master Electrician License Exam · Services & Feeders
This module covers Service Equipment Requirements as part of the Services & Feeders section, testing your understanding of core concepts and their practical application.
| Exam | Master Electrician License Exam |
| Pass Rate | 45% |
| Duration | 300 minutes |
| Module | Service Equipment Requirements |
Why Service Equipment Requirements matters
Service Equipment Requirements is heavily tested because undersized conductors and services cause overheating, fires, and equipment failure.
Sample Practice Questions (5)
1. A commercial building has a 1,200A service with 500 kcmil copper conductors in three parallel sets per phase. Per NEC Table 250.66, the maximum size grounding electrode conductor required is:
- 3/0 AWG copper
- 4/0 AWG copper
- 250 kcmil copper
- 2/0 AWG copper
2. A service disconnect rated at 800 amperes requires the use of a ground-fault protection system per NEC 230.95. The maximum setting for this ground-fault protection is:
- 1,200 amperes with a maximum time delay of 1 second for ground-fault currents of 3,000 amperes or more
- 800 amperes with instantaneous trip
- 2,400 amperes with no time limit
- 600 amperes with a 2-second delay
3. A 400-ampere, 480Y/277V service uses two parallel sets of 350 kcmil copper service entrance conductors per phase. Per NEC Table 250.102(C)(1), what is the minimum size of the main bonding jumper?
- 1/0 AWG copper
- 4 AWG copper
- 2 AWG copper
- 3/0 AWG copper
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Start practicing free →4. Per NEC 250.28(D), the main bonding jumper at a service must be sized according to which table?
- Table 250.66 — same as the grounding electrode conductor
- Table 250.122 — based on overcurrent protection ahead of the service
- Table 310.16 — based on conductor ampacity
- Table 250.102(C)(1) — based on the size of the service entrance conductors
5. Per NEC Table 250.66, a service with 2/0 AWG copper service entrance conductors requires a minimum grounding electrode conductor size of:
- 4 AWG copper
- 6 AWG copper
- 8 AWG copper
- 2 AWG copper
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