This part of 60947 specifies requirements for three-position enabling switches. These switches are used as components of enabling devices described in 10.9 of 60204-1 to provide signals that,a) when activated, allow machine operation to be initiated by a separate start control, andb) when de-activated,i) initiate a stop function, andii) prevent initiation of machine operation.NOTE 1: The enabling control function is described in 9.2.6.3 of 60204-1.NOTE 2: This standard does not deal with enabling devices.This standard does not apply to:- three-position enabling switches for non-electrical control circuits, for example hydraulic,pneumatic;- enabling switches