UL 486C

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.


  • Edition Number: 6
  • Edition Date: 01/11/2013
  • Price Code: B
  • Type: ulcsance
  • ANSI Approved: 01/20/2016
  • DOD Approved: 01/28/1992