CSA C22.3 No. 9:20
Interconnection of distributed energy resources and electricity supply systems
This Standard specifies the technical requirements for the interconnection of distributed energy
resources (DER) and distribution systems up to 50 kV line to line at the point of common coupling (PCC).
This Standard does not define the maximum DER capacity or the upper voltage limit for installations
that are interconnected with a single PCC or connected to a given feeder.
The objective of this Standard is to specify minimum requirements for the
a) safety of persons;
b) continuity of service; and
c) protection of property.
This Standard does not apply to secondary network connections and does not address
a) protection of the power producer’s facility;
b) operating requirements for DER units;
c) transmission system impact and upgrades;
d) planning, design, or operation of the distribution system or DER system;
e) metering, rates, tariffs, and other contractual or commercial issues associated with
f) interconnection of distributed energy resources and distribution systems that are not ultimately
connected to a province-wide or regional electricity grid (i.e., remote locations).
Note: The wires owner of a remote grid might choose to apply this Standard in part or whole, where
appropriate for the remote grid.
In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to
satisfy in order to comply with the Standard; “should” is used to express a recommendation or that
which is advised but not required; “may” is used to express an option or that which is permissible
within the limits of the Standard.
Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a
note accompanying a clause is to separate from the text explanatory or informative material.
Notes to tables and figures are considered part of the table or figure and may be written as
requirements. Annexes are designated normative (mandatory) or informative (nonmandatory) to define