I have been called to a church that is having a problem with losing the "b" phase of a 120/208 volt system.This problem has happened 3 times in 2 weeks. Power company had a problem somewhere along the line which was causing the problem,but not at the church though.The church has 3 phase air conditioning equipment and are concerned about damage to the equipment do to low voltage.The service is 3 seperate 400amp fused disconnects,which are located in different parts of the facility.My question is,is there some type equipment that would shut down the power total if a phase is lost.better to have no a/c than run it on partial power
thank you for your in put