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7.1.2 Joint U.S.-Canadian approvals
The Memorandum of Understanding (MOU), signed between UL and CSA in 2003, affords manufacturers the ability
to certify products for both the U.S. and Canada through a single organization. This reduces the time to bring prod-
ucts to the market and allows the most state-of-the-art products to start benefiting customers more quickly. The
MOU covers the mutual acceptance of components certified by either organization for use in electrical end-product
equipment (e.g. Industrial Control Panels).
For more information regarding the MOU, please follow the links shown below.
(http://ul.com/newsroom/pressreleases/expansion-of-ul-csa/).
(http://www.csagroup.org/ca/en/services/testing-and-certification/agreement-on-acceptance-of-components).
7.1.3 Relevant North American standards
The question is which standard needs to be used in which application. When should the UL 508A, NFPA 79 or both be
used? In most cases the requirements and interfaces should be clearly regulated by both standards. The overlap re-
quirement is generally the norm. Below is an overview of the North American standards referenced in this document.
General installation standards
—
Govern the installation of electrical components
and conductors in each country
—
Scopes include all electrical installations beyond
the point of the utility service drop
—
Applicable for residential, commercial, and indus-
trial structures
—
Often adopted into law by local governments
NFPA
®
70 National Electrical Code
®
(NEC)
United States
CSA C22.1 Canadian Electrical Code
(CEC)
Canada
NOM-001-SEDE-2012 Instalaciones Eléctricas (utilización)
Mexico
Application-specific standards
—
Govern specific applications (e.g. industrial control
panels)
—
Can allow for greater flexibility when designing and
building electrical equipment
NFPA
®
79 – Industrial Machinery
UL 508A – Industrial Control Panels
CSA C22.2 No.14 – Industrial Control Equipment
Product standards
—
Govern the products themselves
—
Quantify the necessary product construction,
marking and tests required for certification
UL 60947-4-1 – Electromechanical Contactors and Motor-Starters
UL 508 – Industrial Control Equipment
UL 508A – Industrial Control Panels
UL 508C – Power Conversion Equipment
UL 489 – Molded-Case Circuit-breakers, Molded-Case Switches, and C.B. Enclo-
sures
UL 98 – Enclosed and Dead-Front Switches
UL 1077 – Supplementary Protectors for Use in Electrical Equipment
UL 248-1 – Low-Voltage Fuses
CSA C22.2 No.60947-4-1 – Electromechanical Contactors and Motor-Starters
CSA C22.2 No.14 – Industrial Control Equipment
CSA C22.2 No.274 – Adjustable Speed Drives
CSA C22.2 No.5 – Overcurrent Protection
CSA C22.2 No.4 – Enclosed and Dead-Front Switches
CSA C22.2 No.235 – Supplementary Protectors
CSA C22.2 No.248 – Low-Voltage Fuses
Table 19: Relevant North American standards.