In order to improve operator safety, Siemens offers a cost effective field modification to convert type D and F switchgear to a closed-door, remote rack design. This modification provides a cost effective solution to keep operators clear of the arc flash zone during breaker racking.

 

Allis-Chalmers and later Siemens manufactured type D and F medium-voltage switchgear from 1958 through the late 1980’s. This gear utilized air-magnetic breakers that were typically manually racked via a lever while the cubicle panel door was open.

Original floor-mounted lever racking, commonly used on type D and F switchgear, required the operator to stand in front of the breaker with panel door open.

 

The field modification consists of a floor-mounted screw racking device and breaker-mounted bracket to interface with the floor-mounted screw device. These additions allow end-users to either have closed-door manual racking, or closed-door remote racking.

Following the field modification, the breaker can be racked in and out while the operator stands outside the arc flash zone.

In order to improve operator safety, Siemens offers a field modification to convert 5 - 38kV type GM switchgear to a remote rack design. This modification provides a cost effective solution to keep operators clear of the arc flash zone during breaker racking.

 

The remote racking option requires a minor front panel modification to accept a torque-regulated motor. The motor can be moved from one cell position to the next, thus only one motor device is required.

 

Original hand crank racking, commonly used on GM switchgear, requires the operator to stand in front of the breaker with the panel door open.

Following the field modification, the breaker can be racked in and out while the operator stands outside of the arc flash zone.