CSA C22.2 No. 61643-21:22
1.1 Scope
This International Standard is applicable to devices for surge protection of telecommunications
and signalling networks against indirect and direct effects of lightning or other transient
overvoltages.
The purpose of these SPDs is to protect modern electronic equipment connected to
telecommunications and signalling networks with nominal system voltages up to 1 000 V
(r.m.s.) a.c. and 1 500 V d.c.
1.1.1A
This Standard applies to equipment primarily used in telecommunication networks and intended to be
installed or used in non-hazardous locations in accordance with CSA C22.1, Canadian Electrical Code,
Part I.
1.1.2A
This Standard does not apply to protective devices such as isolating and neutralizing transformers,
drainage coils and mutual drainage reactors, and optical isolators; nor does it apply to any other devices
that might require special engineering considerations such as the protection of telecommunication
services to, or between, electric power stations.
1.1.3A
This Standard is not applicable to field adjustable protectors.
1.2 SPD configurations
The SPD configurations described in this standard are shown in figure 1. Each SPD
configuration is composed of one or more voltage-limiting components and may include
current-limiting components.
1.3 Use of this standard
This standard considers two basic types of SPD.
The first type of SPD contains at least one voltage-limiting component and no current-limiting
component(s) in a housing. All the SPD configurations of figure 1 can be of this type. These
SPDs shall satisfy the requirements of 5.1, 5.2.1 and 5.3 (see table 1). The SPDs shown in
figures 1b, 1d, 1e and 1f may contain a linear component between the line terminal and
the corresponding protected line terminal. These SPDs shall also satisfy the applicable
requirements of 5.2.2.
The second type of SPD contains both voltage-limiting and current-limiting components in a
housing. SPD configurations shown in figures 1b, 1d, 1e, and 1f are applicable for SPDs with
both voltage-limiting and current-limiting components. This type of SPD shall satisfy the
requirements of 5.1, 5.2.1, 5.2.2 and 5.3 (see table 1). Configurations of protective devices
having only current-limiting components are covered in annex A.
SPDs may need to satisfy additional requirements depending on the application. The
additional requirements are described in 5.2.3 and 5.4 (see table 1).
Subclause 5.2.3 provides transmission tests that SPDs may need to conform to, depending on
their communication and signalling application. Selection of the applicable transmission tests
from 5.2.3 shall be made, based on the intended application of the SPDs. Table 1 provides
general guidance on how to select the applicable transmission tests.
Subclause 5.4 provides the environmental requirements when the SPDs are intended only for
use in uncontrolled environments as described in 4.1. SPDs shall satisfy these requirements
after an agreement between the user and the manufacturer. Table 1 provides examples of
what requirements different types of SPD shall satisfy.
SDO:
CSA
Language:
English
ICS Codes:
29.240;
29.240.10
Status:
Standard
Publish date:
2022-01-31
Standard Number:
CSA C22.2 No. 61643-21:22