To promote the safe selection and use of electrical
equipment and the development of safe work practices; to comply with all
applicable governmental and industrial regulations pertaining to electrical
Electrical safety standards have been developed
by the Occupational Safety and Health Administration (OSHA), the National
Fire Protection Association (NFPA). and the National Electrical Code (NEC).
all electrical equipment should be approved by Underwriters' Laboratories
Inc.(ULI) or the Canada Standards Association Testing Laboratories.
- All electrical equipment, fixtures, and wiring systems,
including grounding connections, overcurrent protective devices, and other
components, shall be installed, maintained, and used in accordance with
the NEC and the NFPA and Subpart S of 29CFR Part 1910. When conflicts between
standards exist, the more stringent standards shall be followed.
- Plaster surfaces that are broken or incomplete must
be repaired so there are no gaps or open spaces at the edge of the box
- Each outlet box must have a cover, face plate, or
- Water, oil, chips and excessive dust around electrical
equipment and machinery must be removed to prevent deterioration of conductors
- A minimum 36-inch clear space shall be provided and
maintained around all electrical equipment and electrical panels to permit
ready and safe operation and maintenance.
- Grounding of cord-and-plug-connected equipment must
be by metal enclosure, grounding conductor, or separate flexible wire or
- All electrical panel boards, boxed, cabinets, and
switch enclosures must be covered or isolated to prevent accidental contact
with live parts, and to protect electrical switches, relays, and wiring
- All cable, conduit, and raceway connections, joints,
and fittings must be tight to assure proper grounding. all enclosures and
conduits must be free from rust and corrosion.
- Extension cords will be used only on a temporary
basis when direct wiring is not reasonable. They shall NOT be used:
- As a substitute for fixed wiring
- Through a hole in a wall, ceiling, or floor
- Through a doorway, window, or similar opening
- Where attached to a building surface
- Where concealed behind a building wall, ceiling,
- In tandem
- With splices or taped repairs
- Where they create a tripping hazard
- Where the power demand on the extension "outlet strip"
exceeds its maximum rating
- Extension cords shall:
- Not have a wire size smaller than No. 14
- Be of the grounded type regardless of the intended
- Be UL listed.
- All extension cords with multiple outlets should
be protected by an internal fuse or circuit breaker.
- All "outlet strips" should be mounted when possible.
- Fixtures on lighting equipment (i.e., lampshades)
shall be constructed of non-combustible or flameproof materials.
- Custom designed electrical apparatus should be inspected
by a competent electrician before being placed in service.
- When faulty electrical wiring (e.g., short circuit,
overheating, insulation failure, and exposed conductors) is detected, the
current must be turned off until the fault has been corrected by authorized
- Electrical fuses must not be bypassed or replaced
with hazardous substitutes or with fuses having a higher amperage capacity
- Telephone wires must not be used for lighting or
- Portable transformers must be de-energized when not
- Electrical wiring must be fastened securely to walls
or ceilings by approved methods.
- Portable electric tools shall be grounded or labeled
as "double insulated". Portable power tools with defective cords or insulation
must be removed from service.
- Electrical wiring must not be looped, fastened, or
placed within 12 inches of stovepipes.
- Lamp fixtures must not be suspended from electrical
- Fluorescent light fixtures having exposed ballasts
or transformers must not be installed in contact with combustible material
unless the fixtures are specifically designed for such installation
- Electrical wiring and fixtures must be of an approved
explosion-proof or dust-proof type (as required by regulations or NFPA
70) when installed or used in places where dangerous concentrations of
explosive vapors, gases, or dusts may be present
- Electric portable heaters and cooking appliances
must be approved in writing by the building superintendent. Approval of
use is based on conformance to the following requirements:
- The appliance is placed on a non combustible surface
- For cooking appliances, a clearance of at least 18
inches from combustibles is maintained in all directions
- A clearance of 3 feet from combustibles is maintained
around space heaters
- Appliance and power cord are both UL listed for proper
- Broilers, portable water heaters (such as coffee
makers), percolators, electric heaters, hot plates, and similar heat producing
equipment shall be UL listed
- Appliance has a visual (lamped) signal indicating
that the power is turned on
- Coffee makers and hot plates shall be unplugged after
- Coffee makers and hot plates shall not be placed
in rooms that may be locked and cannot be easily checked by a security
officer patrolling the area
- Existing electrical circuits are capable of handling
electrical warming/cooking devices
- Combustibles shall be kept a minimum of 18 inches
from boilers, dryers, Bunsen burners, ovens, portable unit heaters, and
gas or oil burner flames, furnaces, hot ducts, mufflers for engines, electric
lamps, and irons.
The Building Superintendent (60 Garden St.) or
building operations office (160 Concord Ave., CDP) should be
contacted to design or review the following aspects or electrical safety:
- General requirements
- Wiring, design and protection
- Wiring methods, components and equipment
- Specific purpose equipment and installations
- Hazardous locations and special systems
The CfA Safety Office is
available to review equipment and work practices, to evaluate electrical
safety programs, and ensure compliance with all applicable regulations
and prudent safety practices: 5-7478.