ryan_618
Senior Member
- Location
- Salt Lake City, Utah
Ten most commonly missed commercial electrical plan review items
1. For equipment rated over 1200 amperes, two exits from the equipment room are required, unless the conditions of 110.26(C)(2)(a) or (b) is complied with. When the exits are doorways, they must swing in the direction of egress travel, and they must be equipped with panic hardware [110.16(C)(2)].
2. Transformers rated over 112.5 kVA must be installed in a room constructed of at least one-hour fire resistive rated construction. There are two exceptions to this rule, both of which are for transformers with a class 155 or higher insulation system [450.21(B)].
3. All 125 volt 15 and 20A receptacle outlets in commercial kitchens must have GFCI protection. There are no exceptions to this rule, contrary to popular belief [210.8(B)(2)]. Remember that a kitchen is defined as an area with a sink and permanent facilities for both cooking and food preparation.
4. Each commercial building (and each occupancy) must have a dedicated 20A branch circuit for the purposes of installing an electric sign [600.5(A)]. This branch circuit can be used for no other purpose.
5. Each commercial building containing a show window (see Article 100 definition) must have receptacles spaced at intervals not exceeding 12? above the show window [210.62]. These receptacles must be calculated in accordance with 220.14(G).
6. Each panelboard must have a panel schedule that provides enough detail to distinguish each circuit from any other circuit in the building [408.4]
7. Where ungrounded circuit conductors are increased in size for voltage drop, the equipment grounding conductor must be increased in size in direct proportion to the change of size in the ungrounded conductor [250.122(B)].
8. The common installation practice of using the next standard breaker rating (above the ampacity of the conductors) is not permitted for transformer secondary conductors [240.21(C)].
9. Panelboards supplied by a transformer must have a main breaker, or the transformer must have secondary overcurrent protection before the panelboard [408.36(D)].
10. Each building can be served by only one service, unless otherwise permitted by 230.2(A) through (D). When a building is supplied by two services, identification of the location of other service disconnects is required [230.2(E)], and the services must use the same grounding electrode system [250.58].
Ryan Jackson
1. For equipment rated over 1200 amperes, two exits from the equipment room are required, unless the conditions of 110.26(C)(2)(a) or (b) is complied with. When the exits are doorways, they must swing in the direction of egress travel, and they must be equipped with panic hardware [110.16(C)(2)].
2. Transformers rated over 112.5 kVA must be installed in a room constructed of at least one-hour fire resistive rated construction. There are two exceptions to this rule, both of which are for transformers with a class 155 or higher insulation system [450.21(B)].
3. All 125 volt 15 and 20A receptacle outlets in commercial kitchens must have GFCI protection. There are no exceptions to this rule, contrary to popular belief [210.8(B)(2)]. Remember that a kitchen is defined as an area with a sink and permanent facilities for both cooking and food preparation.
4. Each commercial building (and each occupancy) must have a dedicated 20A branch circuit for the purposes of installing an electric sign [600.5(A)]. This branch circuit can be used for no other purpose.
5. Each commercial building containing a show window (see Article 100 definition) must have receptacles spaced at intervals not exceeding 12? above the show window [210.62]. These receptacles must be calculated in accordance with 220.14(G).
6. Each panelboard must have a panel schedule that provides enough detail to distinguish each circuit from any other circuit in the building [408.4]
7. Where ungrounded circuit conductors are increased in size for voltage drop, the equipment grounding conductor must be increased in size in direct proportion to the change of size in the ungrounded conductor [250.122(B)].
8. The common installation practice of using the next standard breaker rating (above the ampacity of the conductors) is not permitted for transformer secondary conductors [240.21(C)].
9. Panelboards supplied by a transformer must have a main breaker, or the transformer must have secondary overcurrent protection before the panelboard [408.36(D)].
10. Each building can be served by only one service, unless otherwise permitted by 230.2(A) through (D). When a building is supplied by two services, identification of the location of other service disconnects is required [230.2(E)], and the services must use the same grounding electrode system [250.58].
Ryan Jackson
