Splicing wire connectors

1.1 This Standard applies to single-polarity, hand- or tool-applied splicing wire and cable connectors intended for use with all alloys of copper, aluminum conductors, or copper-clad aluminum conductors, or all three, in accordance with the Canadian Electrical Code Part I, C22.1, in Canada, the National Electrical Code, NFPA-70, in the United States of America, or the Standard for Electrical Installations, NOM-001-SEDE, in Mexico, as follows:

Note: Copper-clad aluminum conductors are for use only in the United States in accordance with the National Electrical Code, NFPA 70.

a) connectors intended to hold two or more conductor(s);

b) connectors intended for use in appliances and equipment that comply with the requirements for such appliances and equipment;

c) connectors intended for use with 6 AWG (13.3 mm2) or smaller conductors; and

d) uninsulated connectors that are used in circuits rated 8 000 V and less.

Note: Examples of splicing wire connectors include twist-on connectors, insulation-piercing or displacement connectors, spring-action connectors, tool-applied crimp, mechanical set-screw connectors, etc.


1.2 This Standard is intended for splicing wire connectors suitable for use with conductors in the size ranges as follows:

a) Aluminum:

   1) 12 AWG (3.3 mm2) and 10 AWG (5.3 mm2) solid;

   2) 12 AWG (3.3 mm2) to 6 AWG (13.3 mm2) stranded, Class B concentric, compressed, and compact; and

   3) 12 AWG (3.3 mm2) to 6 AWG (13.3 mm2) stranded single input wire (SIW).

In Mexico, the use of aluminum conductors is permitted only with thermoset insulation and for sizes of 6 AWG (13.3 mm2) and higher.

b) Copper-clad aluminum:

   1) In Canada, this construction is not allowed.

   2) In Mexico, this construction is not allowed.

   3) In the United States:

      i) 12 AWG (3.3 mm2) and 10 AWG (5.3 mm2) solid; and

      ii) 12 AWG (3.3 mm2) to 6 AWG (13.3 mm2) stranded, Class B concentric, compressed, and Class C concentric.

c) Copper:

   1) 30 AWG (0.05 mm2) to 10 AWG (5.3 mm2) solid; and

   2) 30 AWG (0.05 mm2) to 6 AWG (13.3 mm2) stranded, Class B concentric and compressed, and Class C concentric.

d) Compact-stranded copper conductors:

In Canada and Mexico, for 8 AWG (8.4 mm2) and 6 AWG (13.3 mm2).

In the United States this is not applicable.

e) Rigid (solid and stranded) metric wire falling within the ranges of the above AWG sizes.

Note: For example, a connector rated for 6 AWG (13.3 mm2) - 14 AWG (2.1 mm2) may be additionally rated for 10 - 2.5 mm2.

f) Other class and strand configurations as indicated by marking.


1.3 These requirements cover splicing wire connectors intended for:

a) copper-to-copper;

b) aluminum-to-aluminum;

c) copper-clad aluminum-to-copper-clad aluminum;

d) copper-to-aluminum or copper-clad aluminum and aluminum-to-copper- clad aluminum conductor combinations intended for intermixing of conductors and dry locations only; or

e) all of the above.


1.4 This Standard is intended for splicing wire connectors suitable for currents not exceeding the ampacity of insulated conductors rated 75 °C or 90 °C, in accordance with the rating of the connector.


1.5 This Standard does not apply to:

a) insulated splicing wire connectors intended for use at voltage levels in excess of 600 V [1 000 V in a sign or luminaire];

b) terminal wire connectors;

c) wire binding screw terminals;

d) built-in terminal connectors on devices rated less than 30 A and intended for outlet box mounting or having provision for stress relief;

e) built-in terminal connectors on devices having integral cable clamps;

f) flat quick connect terminals; and

g) soldering lugs