CABLE / ROPE
OPERATED SWITCHES


FEDERAL REGULATIONS
Following are references and excerpts from Federal
Regulations that have applicability to Cable Switches.

  • 29 CFR 1910.216 (c) (2)

    • "On both sides of the calendar and near each end of the face the roll there should be a cable wire center cord connected to the safety trip. They shall operate readily when pushed or pulled."
  • 29 CFR 1910.216 (e)
     "All trip and emergency switches shall not be of the automatically resetting type, but shall require manual resetting".
    		•
  • 29 CFR 1910.218 (j) (3)

    • "Conveyor power transmission equipment shall be guarded in accordance with ANSI B20.1 - 1992."
  • 29 CFR 1910.261 (c) (15) (iv)

    • "Every belt conveyor shall have an emergency stop cable extending the length of the conveyor so that it may be stopped from any location along the line, or conveniently located stop buttons within 10 feet of each work station, in accordance with ANSI B20.1 - 1992."
  • 29 CFR 1910.262 (aa)

    • "A safety trip rod, cable, or wire center cord shall be provided across the front and back of all palmer cylinders, extending the length of the face of the cylinder. It shall operate readily whether pushed or pulled. This safety trip shall be not more than 72 inchest above the level on which the operator stands and shall be readily accessible."
  • 29 CFR 1910.262 (bb)(2)

    • "A safety trip rod, cable or wire center cord shall be provided across the front and back of all rope washers extending the length of the face of the washer. This safety trip shall be not more than 72 inches above the level on which the operator stands and shall be readily accessible."
  • 29 CFR 1910.263 (i)(7)(iii)

    • "Where hazard of getting caught exists a sufficient number of stop buttons shall be provided to enable quick stopping of the conveyor."

    OSHA Sources of standards:
    Sec. 1910.216 is derived from ANSI B28.1 - 1967
    Sec. 1910.218 is derived from ANSI B24.1 - 1971
    Sec. 19101.261 is derived from ANSI P 1.1 - 1969
    Sec. 1910.262 is derived from ANSI Z 8.1 - 1961
    Sec. 1910.263 is derived from ANSI Z 50.1 -1947
  • ASME B 20.1 -1992 (5.11.2) (c)

    • "Remotely and automatically controlled conveyors, and conveyors where operator stations are not manned or are beyond voice or visual contact from drive areas, loading areas, transfer points, and other potentially hazardous locations on the conveyor path not guarded by location, position, or guards, shall be furnished with emergency stop buttons, pull cords, limit switches or similar emergency stop devices."


    REES switches exceed the following:

    Listed by Underwriters Laboratories
    per Standard UL 508 File No. E 58589
    Certified by Canadian Standards Association
    per Standard C 22.2 File No. LR 3648

    NEMA ICS 2 - 1988

    ASME B 20.1
    Following are terms as relating to Cable Switches:

    Reset (A) Auto - After the cable tension is removed, the switch will automatically return to its normal state.

    Reset (M) Manual - After the cable tension is removed, the switch will remain in that state until manually returned to its normal condition.

    Positive Transfer - A contact system so designed that it remains in one state (NO or NC) until the switch actuator moves to a "point of no return," then the contacts transfer and cannot be teased.

    Slow-Make / Slow-Break - A contact system that opens and/or closes at the same rate (speed and time) that the actuator is moved.

    Snap Action - A rapid motion of the contacts from one state to another, that is independent of the rate of travel of the actuator. Similar to "Positive Transfer."

    Emergency Stop - A device that can be actuated in an emergency situation (one that arises from a sudden and unexpected need) and utilizes a positive mechanical action to function as a "stop category 0" device [i.e., stopping by immediate removal of power to the machine or mechanical disconnection between the hazardous elements and their machine actuator(s)].

    Latching Contacts - After the cable tension has been removed, the mechanical trip mechanism will return to its normal state; the contacts then require resetting through an independent means.

    Broken Cable Detection - After the switch has been setup, if for any reason the actuator cable is broken or becomes unattached from the switch or is intentionally pulled, the switch will trip and latch.
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