Stock three-phase motors 1 hp and larger feature IRIS(TM) inverter-rated insulation system, which helps motors withstand voltage spikes that can result from the use of IGBT-type, pulse-width-modulated inverters. The IRIS multi-step process includes specially formulated phase insulation; cushioned and sleeved connections from the leads into the turns; and dipping the wound stator in deep-penetrating, high-temperature varnish.
LEESON Electric Corp., Box 241, Grafton, WI 53024.
Industrial workplaces are governed by OSHA rules, but this isn’t to say that rules are always followed. While injuries happen on production floors for a variety of reasons, of the top 10 OSHA rules that are most often ignored in industrial settings, two directly involve machine design: lockout/tagout procedures (LO/TO) and machine guarding.
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