Manual motor starters can be installed in group motor applications to protect them from overloads, short circuits and other problems. Manual motor starters are used for a variety of devices including machine tools, pumps, and compressors. If you are considering installing a manual motor starter, it is important to know that there are safety regulations that affect your operation. Did you know using manual motor starters as a disconnect switch for electrical maintenance is not allowed under guidelines published by OSHA?
When doing electrical maintenance on a device using a manual motor starter as a disconnect switch,
there is a possibility of controller failure. Manual motor controllers and motor starter circuits are required to have an approved disconnect system that controls all conductors on the power supply . According to OSHA, simply switching the motor starter switch to OFF is not an acceptable method
for shutting down a system--it does not guarantee that a machine is
turned off and without current prior to repair work.