Earlier we discussed basic electrical safety requirements, in this blog we discuss special systems and methods.
To protect employees from electrical injuries and to prevent electrical fires in your workplace, electrical wiring systems must be well designed and well maintained by competent, certified personnel.
Today, in addition to wiring systems, we’ll also review requirements for special electrical systems such as emergency power systems and fire alarm systems. But let’s start with wiring.
OSHA’s wiring, design, and protection rule (29 CFR 1910.304) covers:
- Use and identification of grounded and grounding conductors
- Outside conductors for circuits rated 600 volts, nominal, or less
- Disconnecting conductors
- Overcurrent protection for circuits rated 600 volts, nominal, or less
- Grounding requirements for systems, circuits, and equipment
Wiring Methods, Components, and Equipment
Wiring methods, components, and equipment rules cover wiring methods for:
- Electrical continuity of metal raceways and enclosures
- Temporary electrical power and lighting wiring methods
- Permitted uses of cable trays
- Open wiring on insulators
29 CFR 1910.305 also covers:
- Switches (knife switches, flush-mounted snap switches)
- Switchboards and panelboards
- Enclosures for damp or wet locations
- Conductors for general wiring
- Flexible cords and cables
- Portable cables over 600 volts, nominal
- Fixture wires
- Equipment for general use (e.g., lighting fixtures, lampholders, lamps, receptacles, cord connectors, attachment plugs, appliances, motors, motor circuits, controllers, transformers, certain capacitors, and storage batteries)
The wiring methods, components, and equipment for the general use rule do not apply to the conductors that are an integral part of factory-assembled equipment.
OSHA’s special systems rule (29 CFR 1910.308) covers:
- General requirements for all circuits and equipment operated over 600 volts
- Emergency power systems, such as circuits, systems, and equipment intended to supply power for illumination and special loads, in the event of failure of the normal supply
- Class 1, Class 2, and Class 3 remote control, signaling, and power-limited circuits
- Fire alarm systems
- Communications systems, such as central station connected and noncentral station connected telephone circuit; radio and television receiving and transmitting equipment, including community antenna television and radio distribution systems, telegraph, district messenger, and outside wiring for fire and burglar alarm and similar central station systems
- Solar photovoltaic systems
Contact SWMSC today for more information on how we can help.