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Electrical Safety Violations

June 21, 2019 5106

Some of the violations commonly found by Cal/OSHA at dental practices are those compromising electrical safety. Penalties paid by dental practices within the past three years range from $85 to $840 per incident. Dentists should be familiar with electrical safety regulations. Following are the Title 8 regulations cited at practices found to have violations.

2500.8. Uses Not Permitted

  1. Unless specifically permitted otherwise in Section 2500.7, flexible cords and cables shall not be used:
    1. As a substitute for the fixed wiring of a structure.
    2. Where run through holes in walls, ceilings or floors.
    3. Where run through doorways, windows or similar openings.
    4. Where attached to building surfaces.
    5. Where concealed behind building walls, ceilings or floors.
    6. Where installed in raceways, except as otherwise permitted in these Electrical Safety Orders.

2340.17. Guarding of Energized Parts

  1. Except as elsewhere required or permitted by these orders, energized parts of electric equipment operating at 50 volts or more shall be guarded against accidental contact by use of approved cabinets or other forms of approved enclosures or by any of the following means:
    1. By location in a room, vault or similar enclosure that is accessible only to qualified persons.
    2. By suitable permanent, substantial partitions or screens so arranged that only qualified persons will have access to the space within reach of the energized parts. Any openings in such partitions or screens shall be so sized and located that persons are not likely to come into accidental contact with the energized parts or to bring conducting objects into contact with them.
    3. By location on a suitable balcony, gallery or platform so elevated and otherwise located as to prevent access by unqualified persons.
    4. By elevation of 8.0 feet (2.44 m) or more above the floor or other working surface.
  2. In locations where electric equipment is likely to be exposed to physical damage, enclosures or guards shall be so arranged and of such strength as to prevent such damage.
  3. Entrances to rooms and other guarded locations containing exposed live parts shall be marked with conspicuous warning signs forbidding unqualified persons to enter.

2340.22. Identification of Equipment

  1. Motors and Appliances. Each disconnecting means required by this Safety Order for motors and appliances shall be legibly marked to indicate its purpose, unless located and arranged so the purpose is evident.
  2. Services, Feeders and Branch Circuits. Each service, feeder and branch circuit, at its disconnecting means or overcurrent device, shall be legibly marked to indicate its purpose, unless located and arranged so the purpose is evident.
  3. Each service disconnecting means shall plainly indicate whether it is in the open or closed position.
  4. Durability of Markings. The markings shall be of sufficient durability to withstand the environment involved.
  5. Capable of Accepting a Lock. Effective with installations made after May 5, 2008, disconnecting means required by these Orders shall be capable of being locked in the open position.
  6. Marking for Series Combination Ratings.

Effective with installations made after May 5, 2008:

  1. Where circuit breakers or fuses are applied in compliance with the series combination ratings marked on the equipment by the manufacturer, the equipment enclosures shall be legibly marked in the field to indicate that the equipment has been applied with a series combination rating.
  2. The marking required by subsection (f)(1) of this section shall be readily visible and shall state “Caution —Series Combination System Rated — Amperes. Identified Replacement Component Required.”

2340.16. Work Space About Electric Equipment

Following is a partial copy of the regulation.

  1. Space about electric equipment. Sufficient access and working space shall be provided and maintained about all electric equipment to permit ready and safe operation and maintenance of such equipment.
  2. Work Space. Working space for equipment likely to require examination, adjustment, servicing or maintenance while energized shall comply with the following dimensions, except as required or permitted elsewhere in these Orders.
    1. Depth. The depth of the working space in the direction of access to live parts shall not be less than indicated in Table 2340.16 unless permitted elsewhere in these orders. Distances shall be measured from the live parts if they are exposed or from the enclosure front or opening if they are enclosed.
    2. Width. In addition to the dimensions of depth shown in TABLE 2340.16, the width of the workspace in front of the electric equipment shall not be less than the width of the equipment or 30 inches, whichever is greater. In all cases, the workspace shall be adequate to permit at least a 90 degree opening of equipment doors or hinged panels.
    3. Height. The work space shall be clear and extend from the grade, floor, or platform to the height required by subsection (f) of this section. However, other equipment associated with the electrical installation and located above or below the electric equipment may extend not more than 6 in. (153 mm) beyond the front of the electric equipment.
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