Special occupancies and emergency systems
About one question in eight on the ICC master exam comes from special occupancies, equipment and conditions. These questions reward knowing where each rule lives: pools in Article 680, health care in 517, temporary wiring in 590 and the three standby systems in 700, 701 and 702.
A timed 100-question exam in the ICC R16 format on the 2023 NEC, or the two-part Texas exam. Every answer has a worked explanation and you get a score by topic.
Or start with the free special occupancies and emergency systems drillEmergency, legally required and optional standby
Emergency systems are required by codes for life safety (egress lighting, fire alarm), legally required standby systems by codes for other public needs, and optional standby systems are chosen by the owner.
| System | Article | Power available within |
|---|---|---|
| Emergency | 700 | 10 seconds |
| Legally required standby | 701 | 60 seconds |
| Optional standby | 702 | No time set by the NEC |
Swimming pools (Article 680)
- Outlets supplying pool pump motors on branch circuits rated 150 V or less to ground and 60 A or less, single- or three-phase, need GFCI protection (680.21(C)).
- Receptacles must be at least 6 ft from the inside wall of the pool, and 15 and 20 A receptacles rated 125 V through 250 V within 20 ft need GFCI protection (680.22(A)).
- The equipotential bonding grid uses solid copper conductors not smaller than 8 AWG (680.26(B)), and the perimeter surface extends 3 ft from the inside wall (680.26(B)(2)).
Health care facilities (Article 517)
- Patient care spaces are Category 1 (critical care), Category 2 (general care), Category 3 (basic care) and Category 4 (support) spaces, as defined in Article 100 (517.2 in 2020).
- The essential electrical system of a hospital is split into the life safety, critical and equipment branches (517.31).
Practice special occupancy questions
A timed 100-question exam in the ICC R16 format on the 2023 NEC, or the two-part Texas exam. Every answer has a worked explanation and you get a score by topic.
Or start with the free special occupancies and emergency systems drillTemporary power (Article 590)
All 125 V and 125/250 V, single-phase 15, 20 and 30 A receptacle outlets used by personnel during construction, remodeling, maintenance or repair need GFCI protection (590.6(A)).
Common questions
How fast must an emergency system pick up the load?
Within 10 seconds of failure of the normal supply (700.12). Legally required standby systems have 60 seconds (701.12).
What size is the pool equipotential bonding conductor?
Solid copper, 8 AWG or larger (680.26(B)).
Do temporary receptacles on a construction site need GFCI protection?
Yes. All 125 V and 125/250 V, single-phase 15, 20 and 30 A receptacle outlets used by personnel need GFCI protection (590.6(A)).
Practice special occupancy questions
A timed 100-question exam in the ICC R16 format on the 2023 NEC, or the two-part Texas exam. Every answer has a worked explanation and you get a score by topic.
Or start with the free special occupancies and emergency systems drillMore master exam guides
Section numbers follow the 2023 National Electrical Code (NFPA 70); rules are paraphrased, not quoted. Independent preparation, not affiliated with NFPA, ICC, PSI, Pearson VUE or any state board.