OSHA Requirement for Breakers to accept lockout devices

[cericks66]

Does the NEC address this OHSA 1910.147 safety requirement?

What have/ are manufacturers doing to meet this design requirement?

Any history/ thoughts?? Thanks

OSHA 1910.147(c)(2)(iii) After January 2, 1990, whenever replacement or major repair, renovation or modification of a machine or equipment is performed, and whenever new machines or equipment are installed, energy isolating devices for such machine or equipment shall be designed to accept a lockout device.

1910.147(b)
Energy isolating device. A mechanical device that physically prevents the transmission or release of energy, including but not limited to the following: A manually operated electrical circuit breaker; a disconnect switch; a manually operated switch by which the conductors of a circuit can be disconnected from all ungrounded supply conductors, and, in addition, no pole can be operated independently; a line valve; a block; and any similar device used to block or isolate energy. Push buttons, selector switches and other control circuit type devices are not energy isolating devices.

Lockout device. A device that utilizes a positive means such as a lock, either key or combination type, to hold an energy isolating device in the safe position and prevent the energizing of a machine or equipment. Included are blank flanges and bolted slip blinds.

 

[jeremysterling]

I think the machines OSHA are referring to are made with an integral disconnect that meets the NEC requirement for motor disconnect(NEC art 430.102).

There is usually a hole or pull-out hasp on the rotary disconnect switch on the equipment itself.

To bring older machines that do not have this could be as simple as a DIN rail mounted switch with linkage through the controller door.

Edit to say, OCPD is required for motor and conductor protection, but the intent of these sections is for disconnecting only, therefore "breakers" are not used for this standard

 

[pfalcon]

Yes, OSHA failed at wordsmithing again. See also 1910.303(f)(4)

Accepting a lockout device and is not the same as having an integral lockout device. A breaker does not have to be made with room to hang a lock. It must be made and mounted such that a lock can be accepted as a part of the design of the machine or equipment.

On machine tools this is normally accomplished by applying the lock to a physical disconnect mounted on the enclosure.

On a breaker panel this can be accomplished by throwing the breaker, closing the door, then applying a lock to the door. See NFPA70E:2009:120.2(E)(3)(d)