Protection & Controls
Remote Racking and Remote Breaker Operation
Racking a drawout breaker and closing a breaker into an unknown condition are the two switchgear operations most likely to start an arc, and both have traditionally been done by a person standing at the door. This article covers the equipment and procedures that move that person outside the arc-flash boundary and what has to be true of the interlocks for that to be safe.
6 min read · Updated 2026-09 · Apex Power Distribution Engineering
Why distance is the mitigation that always works
Incident energy from an arcing fault falls off steeply with distance from the arc; in the IEEE 1584 model it is a function of working distance raised to a negative exponent, so moving from a typical 18 to 24 inch working distance to 25 feet or more reduces the energy at the worker by orders of magnitude. Distance changes whether the worker is in the event at all.
NFPA 70E's hierarchy of risk controls ranks elimination and substitution first, then engineering controls, awareness, administrative controls and PPE last. Remote racking and remote operation are engineering controls. They do not remove the hazard, but they remove the person from the location where the hazard is realized, for the two tasks that its likelihood tables identify as most likely to initiate an arc: inserting or removing a breaker from a cubicle and operating equipment whose condition is not known.
Portable remote racking systems
A portable remote racking system is a motor drive that mounts to the switchgear door or racking port and couples to the breaker's racking shaft, operated from a pendant on a long cable or a paired wireless controller. The operator stands 25 to 30 feet away, or around a corner or behind a wall, and drives the breaker between connected, test and disconnected positions while watching position indicators through a camera or from the remote position. One unit with the appropriate adapters serves every breaker of that frame type in the facility.
Good units limit torque and stop if the mechanism binds rather than forcing it, count shaft revolutions to estimate position, and confirm the breaker is open before racking begins. Portable systems are the practical retrofit for existing low-voltage and medium-voltage drawout switchgear that was never designed for remote operation.
Integrated motorized racking
New switchgear can be specified with a racking motor built into each cell or each breaker, controlled from pushbuttons at the end of the lineup, from a local HMI or through SCADA. Position switches report connected, test and disconnected states to the control system, and the same interlocks that govern the manual crank govern the motor. The operator never touches the cell during racking, and the operation can be performed with the door closed on switchgear designed for closed-door racking.
Integrated racking adds cost per cell and a motor and controls to maintain. In return it is always in place, needs no setup and allows complete remote sequences such as tripping a breaker, racking it to test and running a functional test without anyone entering the room.
Remote open and close
Electrically operated breakers already have close and trip coils, so remote operation is a matter of where the command originates and where the operator stands. Options include the protective relay's front-panel control or its pushbuttons wired to the coils, an HMI at the lineup end or in a control room, SCADA with select-before-operate, or a pendant plugged into a remote operation receptacle that lets a technician stand outside the boundary during a local switching order.
A local-remote selector on the switchgear defines which commands are accepted, and its position should be indicated at both ends. Closing is the operation that deserves the most caution: closing into an undetected fault or a left-in ground set is a common arc-flash scenario, so a breaker that tripped on protection is investigated before it is closed again, from any location.
Interlocks, indication and failure modes
Remote racking is only as safe as the interlocks it works through. The breaker must be open and held trip-free before and during racking, the racking mechanism must stop at each defined position, the shutters must operate normally and the door must remain closed where the design requires it. NFPA 70E prohibits bypassing safety interlocks except under specific controlled conditions, and racking is not one of them.
The operator at the remote position needs positive indication: position switch status on the controller or HMI, a camera view of the mechanical indicators, or both. Every system needs an emergency stop and a defined response for a loss of power or a stall that leaves the breaker between positions, which normally means treating the cell as energized and completing the movement with the manual crank only after the arc-flash risk assessment for that condition has been applied.
Procedures that make it work
Equipment changes exposure; procedures make the change stick. A written procedure for remote racking and switching covers the pre-checks on breaker state and control power, clearing all personnel beyond the arc-flash boundary, communication between the operator and anyone else in the area, the operation itself, verification of the final position from the remote point, and the PPE required for the approach afterward as determined by the risk assessment for the resulting condition.
Remote racking to the disconnected position is also a natural step in establishing an electrically safe work condition, followed by lockout and verification of absence of voltage in the normal way. Training on the specific racking system, periodic maintenance of the drive and adapters, and inclusion of remote operation in the facility's electrical safety program complete the picture.
Key takeaways
- Incident energy falls steeply with distance; putting the operator 25 feet away or behind a wall changes whether they are in the event at all.
- Racking and closing into an unknown condition are the operations most likely to start an arc, and NFPA 70E treats remote operation as an engineering control for both.
- Portable racking systems retrofit existing drawout switchgear; integrated motorized racking on new gear allows closed-door, fully remote sequences.
- Remote systems must work through, never around, the breaker-open, position and shutter interlocks, with positive position indication at the remote point.
- Written procedures, training and integration with lockout practice turn the equipment into a lasting reduction in exposure.