[rohrmann]

Prior to installing a 50 amp PI EMS, we just had the portable PI surge arrestor. We had a voltage bump from the utility which took out both our satellite boxes. Since installing the hardwired EMS, we have seem missing neutral, missing ground, and numerous low voltage conditions. The one missing ground turned out to be a broken ground prong on our shore cable plug, which would not be visible with a portable device, as any of these units only look back toward the source, meaning the pedestal and beyond. With the hardwired units, they see all the RV internal wiring from the hardwired device out to the pedestal, too, which can’t be seen by the portable units. Also, with the hardwired with the remote display, there is a bypass switch that can close the contactor to turn on power, which cuts out the voltage checking and protection but still keeps the surge protection feature working. So, for a voltage issue that causes the unit to turn off power, if you dare risk damage, you can manually bypass these units to get power into the rig. You really should not do this as you risk not only damage but also a hot skin condition that can shock you or anyone touching the rig, which can be extremely dangerous.