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Overriding Safeguards

Question asked by christopher.r.thompson on Feb 4, 2019

Per NFPA 79 9.2.4:

 

9.2.4 Overriding Safeguards. Where it is necessary to temporarily
override one or more safeguards, a mode selection device
or means capable of being secured (e.g., locked) in the desired
mode shall be provided to prevent automatic operation. The
control circuit for the suspension of a safeguard shall have the
same safety requirements as the suspended safeguard itself. In
addition, one or more of the following measures shall be provided:
(1) Initiation of motion by a hold-to-run or other control
device.
(2) A portable control station (e.g., pendant) with an emergency
stop device, and where used, an enabling device.
Where a portable station is used, motion shall only be
initiated from that station.
(3) Limiting the speed or the power of motion.
(4) Limiting the range of motion.

 

What is meant by the sentence "The control circuit for the suspension of a safeguard shall have the same safety requirements as the suspended safeguard itself."?

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