Page 65 - Puret Sound Energy Hand Book 1218

Chapter 6

Interconnection system diagrams

For PSE to review the installation proposal, an electric system one-line diagram must
be provided with application for service. The one-line diagram shall schematically
represent the following equipment and electrical connectivity:
• Generator
• Inverter
• Battery bank (as applicable)
• Disconnect switch (as applicable)
• Production meter
• Main electrical panel
• Sub panel (as applicable for battery backup)
• Service meter/Net meter
• Utility service point of connection
A system diagram guide can be found at:
pse.com/savingsandenergycenter/Renewables/Documents/PSE_Sytem_Diagram_Guide.pdf

Meter location

Net meters and production meters are subject to the meter location requirements
defined in Chapter 5 of this handbook.
Additionally, the production meter must be located “adjacent” to the net meter
except as described in two exceptions detailed in the following paragraphs.
“Adjacent” is defined as between 10 inches to 6 feet center-to-center along the
same wall. Installers may not round corners.
The following exceptions provide the conditions under which net and production
meters are not required to be located adjacent to each other:
Exception No. 1: When the production system is installed on a separate structure
from the service meter (net meter), the production meter may be installed on the
same structure as the production system if it also has an electric subpanel. If the
structure does not have an existing electric subpanel, the production meter must be
colocated with the service meter (net meter).
A typical example would be a system of solar panels on a barn where the barn
is served off a branch circuit from the main panel of the house. In this case, the
production meter could be located on the barn rather than adjacent to the service
meter at the house.
Ground mount installations do not qualify as separate structures.
Exception No. 2: When the service meter (net meter) is remotely located on a
pedestal or post (see the remote metering for underground residential services
section in Chapter 2, Permanent Underground Service), the production meter
may be installed on the same structure as the production system if it also has an
electric panel.
Exception No. 3: When there is no space available or it is extremely difficult to place
the production meter adjacent to the service (net meter), the production meter may
be installed where there is a line-of-sight from the service (net meter).
For these exceptions, the production meter placement must still meet all standards
for access and placement.

Electric Service Handbook 2017 — Single-Family Residential Projects 56
OCTOBER 2017 UPDATE