To All Rules Book Holders:
Effectively immediately, PPL has approved the use of the following types of meters on PPL's system:
- Class 320, three phase, self-contained kilowatt-hour meters. These meters will be used to meter 3 phase, 4 wire, 208Y/120 volt and 3 phase, 4 wire, 240 volt delta, 400 Ampere Services.
- Class 480, three phase, self-contained kilowatt-hour meters. These meters will be used to meter 3 phase, 4 wire, 208Y/120 volt and 3 phase, 4 wire, 240 volt delta, 600 Ampere Services.
Attached is a current list of approved meter troughs, and line and load side connectors, for Class 320 and Class 480 meters. PPL will publish a revised list of Approved Meter Service Devices in the future that will include these new meter troughs.
The customer (or customer's contractor) is responsible for supplying both the line side and load side connectors. Please note that various connector options are available. For Class 480 meter troughs, the contractor must contact PPL to determine PPL's line side requirements prior to purchasing connectors.
Rule 14, paragraph (a), of PPL's Rules for Electric Meter and Service Installations Book will be revised in the future to include Class 320, 3 phase meters and Class 480, 3 phase meters.
R. A. Kapo
Chairman - Committee on Rules for Electric Meter & Service Installations