UL Standard for Safety Wire Connectors for Use with Aluminum Conductors
|Publication Date:||26 February 1997|
These requirements apply to pressure wire connectors intended for use with aluminum or copper-clad aluminum conductor or both according to the National Electrical Code, NFPA 70. The connectors may be constructed so
that they are also acceptable for use with copper conductor.
These requirements also cover ampere-rated connectors intended for use
in appliances and equipment and that comply with the requirements specific to those appliances and equipment. Ampere-rated connectors are not intended for general use. Ampere-rated connectors are additionally evaluated for static temperature rise in the end-use application. Ampere-rated connectors shall be identified as such by the appropriate
marking requirements. See 21.21.
These requirements cover:
a) Terminal-type wire connectors intended for use with No. 12 AWG
(3.3 mm(2)) or larger aluminum or copper-clad aluminum conductor, including those designated also for No. 30 AWG (0.5 mm(2)) or larger copper conductor, and
b) Splicing-type wire connectors intended for use with No. 4 AWG (21.2 mm(2)) or larger conductors, with currents not exceeding the ampacity of insulated conductors rated 75 degrees C or 90 degrees C in accordance with the connector rating and not exceeding the maximum current rating - if provided - of the connector. A splicing connector may have a conductor range that includes sizes smaller than No. 4 AWG. For connectors intended for use with stranded conductors, the following conductor strand configurations are intended:
1) Aluminum - Class B concentric, compressed, and unidirectional lay compact.
2) Copper - Class B concentric and compressed, Class C
3) Copper-Clad Aluminum - Class B concentric
Other class and strand configurations may also be covered as indicated
These requirements also cover connectors of the types specified in 1.3 intended for use with metric conductors that have cross sectional area within the range of the rated AWG/kcmil conductors. For example, a connector rated for 6 AWG - 250 kcmil may additionally be rated for 16 -
120 mm(2). See 6.1.13, 18.104.22.168, 21.26, and 21.27.
1.3.1 added May 22, 2000
These requirements cover insulated connectors, insulating caps, and
covers intended for use at 600 volts or less [1000 volts in a sign or lighting fixture (luminaire)] and uninsulated connectors for use in
general-use circuits rated 2000 volts nominal or less.
Exception: Uninsulated pressure wire connectors (both terminal and
splicing type) that are compression tool applied may be used in circuits rated 35,000 volts or less. When connectors are used in such circuits, the stress-relief insulation prescribed by the manufacturers of shielded
cables is to be provided when these connectors are installed.
These requirements also cover connectors additionally rated for No. 2
AWG (33.6 mm(2)) and larger compact-stranded copper conductors. These connectors are identified in accordance with 21.8. See also 3.2 and the
Exception to 7.2.7(b) (3).
1.5 revised May 22, 2000
These requirements do not cover connectors intended for direct burial,
insulated connectors intended for use at voltage levels in excess of 600 volts [1000 volts in a sign or lighting fixture (luminaire)], manually applied screw-on connectors, binding-screw terminals, built-in terminal connectors on devices rated under 30 amperes and intended for outlet-box mounting or having provision for strain relief, or built-in terminal
connectors on devices having integral cable clamps.
A product that 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 or of electric shock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the 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 does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard.