CSA C22.2 NO 229
Switching and Metering Centres
|Publication Date:||1 January 2017|
This Standard applies to switching and metering centres (hereafter may be referred to for convenience as metering centres or centres) rated 600 V and less, intended to be used in accordance with the Rules of the Canadian Electrical Code, Part I, in nonhazardous locations, to provide switching, overcurrent protection and metering for a number of circuits supplied from a consumer service. The centres may also include the service compartment.
This Standard applies to centres that
a) have the individual circuit overcurrent devices connected on the supply side of the meter-mounting devices; or
b) have the individual circuit overcurrent devices connected on the load side of the meter-mounting devices for devices where the voltage between conductors does not exceed 300 V ac.
A centre as covered by this Standard consists of individual metering sections containing meter-mounting devices and circuit breakers or fusible switches or having provision for mounting such circuit breakers or fusible switches, and the following components, which may be either factory or field assembled to each other:
a) mains terminal section (connection box) or main switch or main circuit breaker section;
b) elbow assemblies;
c) subfeed terminal sections; and
d) main busbars or linkages, or both.
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; and "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 (non-mandatory) to define their application.