... intelligent building, intelligent power distribution cabinets, large-scale UPS systems; n Product features PD862D-9SY Three-phase multi- ... be easy to use even in dark environments.n High voltage systems or low voltage systems, ... disk of meter need to install, open a 87mm × 87mm square hole;n Remove out the meter ... Pre-Opened hole from front to back;n Fit two install clamps along both sides of the groove ...