Page 66 - Puret Sound Energy Hand Book 1218

Chapter 6

Meter socket requirements

Customer-provided metering equipment shall meet the requirements stated in
Chapter 5 of this handbook. Installers may not tap at or in the meter socket
(supply side tap).

Labeling requirements

All meter sockets shall be labeled with permanently affixed signage at the
production meter and net meter enclosures to identify their function (i.e., net meter
or production meter). Where metering is accomplished at different voltages, the
signage must also identify the voltages at which the meters are energized. Labels
shall conform to the requirements of NEC article 690.
NOTE: Felt-tip pens and label marker tape are not considered permanent marking.

Disconnect switch requirements

PSE must have the ability to disconnect a generator from PSE’s system for
employee protection. A disconnect switch is recommended to be installed for all
customer generation systems, and required in some cases.
A disconnect switch is required if your system meets any of the following
characteristics:
• Output is greater than 25 kW
• Electric service is three-phase
• Electric service is CT-metered
A disconnect switch is optional if your system meets all of the following characteristics:
• Output is 25 kW or less
• Electric service is single-phase
• Electric service is self-contained

Disconnect When a production system requires a disconnect switch, the following criteria shall
switch location be applied to determine the location of the disconnect switch:
• For 240 V and 120/208 V self-contained and CT-rated production meters, the
disconnect switch shall be on the line side of the production meter (between the
production meter and the inverter).
• For customers that have no load between the PSE transformer and inverter
(typically community solar or power purchase customers), only one bidirectional
meter is necessary to monitor production credits and inverter load. The
disconnect switch shall be on the load side of the generation/service meter
(between the meter and the inverters).
• When more than one production meter is required for the customer production
system, the disconnect location shall be determined by PSE Meter Engineering.

Electric Service Handbook 2017 — Single-Family Residential Projects 57