N.Y.C. Admin. Code § FC 2904: Section FC 2904: Electrical Equipment and Protection

2904.1 Wiring and equipment.

Electrical wiring and equipment shall be designed, installed, operated and maintained in accordance with this chapter and the Electrical Code.

2904.2 Hazardous locations.

Where Class I liquids are exposed to the air, the facility, including all equipment and the ventilation system, shall be designed in a manner that limits Class I, Division 1, locations to the following:

1. Piping trenches.

2. Within the equipment.

3. The immediate vicinity of pumps or equipment locations, such as dispensing stations, open centrifuges, plate and frame filters, opened vacuum filters, change cans and the surfaces of open equipment. The immediate vicinity shall include a zone extending from the vapor liberation point 5 feet (1524 mm) horizontally in all directions and vertically from the floor to a level 3 feet (914 mm) above the highest point of vapor liberation.

2904.2.1 Other locations.

Locations within the confines of the manufacturing room where Class I liquids are handled shall be Class I, Division 2, except locations indicated in FC 2904.2.

2904.2.2 Ordinary equipment.

Ordinary electrical equipment, including switchgear, is prohibited except where installed in a room maintained under positive pressure with respect to the hazardous area. The air or other media utilized for pressurization shall be obtained from a source that will not cause any amount or type of flammable vapor to be introduced into the room.

2904.3 Bonding.

In any area of the facility in which an ignitable mixture may be present in the atmosphere, equipment, including, but not limited to, tanks, machinery and piping, shall be bonded and connected to a ground.

2904.3.1 Piping.

Electrically isolated sections of metallic piping or equipment shall be grounded or bonded to the other grounded portions of the system.

2904.3.2 Vehicles.

Cargo tanks loaded or unloaded through open connections shall be grounded and bonded to the receiving system.

2904.3.3 Containers.

Where a flammable mixture is transferred from one portable container to another, a bond shall be provided between the two containers, and one shall be grounded.

2904.4 Ground.

Metal framing of buildings shall be grounded with resistance of not more than 5 ohms.