This past Friday nite my facility {retirement community} experienced a brown-out,needless to say we lost several peices of 3Ph eqiupment.The apartment buildings use 208v 1Ph to feed each apartments heat pump & air handler.We were required to shut down power to each apartments HVAC equipment to prevent damage to it.The lead HVAC mechanic does not belive in this theory {as I & the facilities director do}.He adamantly belives a low voltage condition will have no bearing on the life of a 1PH motor. Thanks in advance for your viewpionts