Preface
This is the harmonized ANCE, CSA Group, and UL standard for transfer switch equipment. It is the second edition of NMX-J-672-ANCE, the third edition of CSA C22.2 No. 178.1, and the eighth edition of UL 1008. This edition of NMX-J-672-ANCE supersedes the previous edition published on July 6, 2012. This edition of CSA C22.2 No. 178.1 supersedes the previous edition published in 2012. This edition of UL 1008 supersedes the previous edition published on July 6, 2012.
This standard has been approved by the American National Standards Institute (ANSI) as an American National Standard.
This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.
Scope
1.1
This standard applies to:
a) Automatic transfer switches;
b) Manual or non-automatic transfer switches;
c) Closed transition transfer switches;
d) Hybrid transfer switches;
e) Transfer switches for fire pumps;
f) Bypass/isolating switches;
g) Softload transfer switches;
h) Transfer switches intended for use as service equipment; and
i) In Mexico and the United States, branch circuit emergency lighting transfer switches (BCELTS). In Canada, this requirement does not apply.
that have a maximum rating of 1000 volts for use in non-hazardous locations, in accordance with Annex A1, Item 1.
1.2
This standard specifically does not apply to:
a) Double-throw switches for use in optional standby systems;
b) Switches used in equipment manufactured in accordance with Annex A1, Item 9;
c) In Canada, manually operated generator transfer panels in accordance with Annex A1, Item 12. In Mexico, this requirement does not apply.
d) Transfer switches rated over 1000 V; and
e) Solid-state (static) transfer equipment.
1.3
These requirements apply to transfer switches and their associated control devices including voltage sensing relays, frequency sensing relays, time-delay relays, and the like.
1.4
These requirements apply to completely enclosed transfer switches and to open types intended for mounting in other equipment such as switchboards.
1.5
These requirements apply to bypass/isolation switches used to manually select an available power source to feed load circuits and to provide for total isolation of an automatic transfer switch. These switches may be completely enclosed, enclosed with the transfer switch, or of the open type intended for mounting in other equipment. Refer to Annex D.
1.6
In Canada, automatic transfer switches built to the optional standby requirements of this standard are not permitted. In Mexico and the United States, this requirement does not apply.
1.7
These requirements cover enclosed inlets intended to facilitate connection of portable generators to transfer equipment.
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