Who here still allows self contained 480 metering? Does anyone who still allows it still allow hot sequence?
Minnesota Power and several other utilities have instituted polices that there is very little or even no self contained metering at 480 volt anymore. Most of the time that goes for both 3 phase and also single phase 240/480 volt. Most are doing this in response to the arc flash concerns. With the new high accuracy CTs available in today’s market moving to CT rated on even smaller loads registration and revenue loss is not much of any concern.
We still use the Line Side Disconnect Socket – So far no issues with having to shut anything down to change or fix a meter – See a lot of this on Irrigation – Not really so much in the Industrial or Commercial side because the service is big enough to have either a CT cabinet or Transition Cabinet. So far we have been happy with the change – and at no point should anyone install a 480V socket with lever bypass – IMO
The Upper Midwest Metering Association serves the upper midwest states of Minnesota, Iowa, Wisconsin, South Dakota, and North Dakota. We provide connections for members, utilities, meter schools, and vendors in our bi-annual meetings and continuous dialog throughout the year.