Voltage Sags - Neighbors

Voltage sags are a very normal occurrence on the power lines. The closer a neighbor is located, the more likely sags caused by the neighbor may disrupt or damage equipment in the facility. If equipment is disrupted, then data flow will be affected as well.

Sags occur when there are changing currents interacting with system impedance. Loads in the neighbor's facility or office must be large enough and changing enough to affect the voltage feeding the facility or office. Quite often this occurs when a panel, office, or whole building trips a breaker. When someone throws the breaker back on, a sag results.

If shared wiring is present, then simple devices like copy machines and printers may cause similar concerns.

Most of the time neighbor-induced sags are difficult to identify. If they can be determined, then one solution may be a simple procedural change to prevent the radical load changes or breaker trippage.

Once again, if neighbors are creating these disturbances, it is a good idea to request the utility's input on how to resolve the situation.

If the voltage instability cannot be stopped at the source, then voltage regulators must be used to prevent the problems.