It’s the foundation of any electrical safety program: limiting the exposure of workers to the electrical hazards of shock and arc flash. Using test leads and clamps to probe inside a live panel when troubleshooting and performing routine maintenance always exposes workers to danger.
This amount of mechanical motion inevitably causes screws to reposition, springs to weaken and mechanical linkage to loosen. In addition, electronic components change value over time. The results are valves that don’t fully open or close, close prematurely, or operate erratically and cause improper regulation of the gas or liquid under its control. This is more commonly referred to as “calibration drift.