1 Scope 1.1
These requirements cover permanently installed devices, hereafter referred to
as dimmers, that employ a dimming function intended for control of lighting
loads of the ballast, transformer, or tungsten-filament type, and are intended
to be installed in a wallbox or are provided with an enclosure for flush or
surface mounting in accordance with the Canadian Electrical Code, Part 1 (CEC),
and the National Electrical Code (NEC), ANSI/NFPA 70. 1.2
These requirements cover devices, other than touch dimmers, rated 600 volts ac
or less, and touch dimmers rated 120 volts ac or less, all for installation on
a 20-ampere or less branch circuit. 1.3
These requirements cover dimmers, including touch dimmers, having a minimum
power rating of 300 W or 300 volt-amperes, and a maximum power rating of 2000 w
or 2000 volt-amperes in increments of 50 watts or 50 volt-amperes. 1.4
A device incorporating other functions (for example, speed control) in addition
to a dimming function is investigated on the basis of compliance with the
applicable requirements for the dimming function in this Standard as well as
requirements for the other functions in the applicable standards. 1.5
These requirements do not cover dimmers that use only a resistor or a
transformer to perform the dimming function. 1.6
These requirements do not cover modular, cabinet or console type constructions. 1.7
A product contains features, characteristics, components, materials, or systems
new or different from those covered by the requirements in this standard, and
that involves a risk of fire, electric shock, or injury to persons shall be
evaluated using the appropriate additional component and end-product
requirements as determined necessary to maintain the acceptable level of safety
as originally anticipated by the intent of this standard. A product whose
features, characteristics, components, materials, or systems conflict with
specific requirements or provisions of this standard cannot be judged to comply
with this standard. Where considered appropriate, revision of requirements
shall be proposed and adopted in conformance with the methods employed for
development, revision, and implementation of this standard.