Extruded Insulating Tubing

1.1
This Standard specifies the requirements for insulating tubing that is usually round in cross-section and that consists entirely of extruded compounds whose characteristic constituents are thermosetting, elastomeric, or thermoplastic polymers (see Table 1 for materials and ratings). These requirements also cover heat-shrinkable and crosslinked tubing.

A product for use at temperatures greater than indicated in Table 1 or a different polymer may be acceptable provided that:

(a) it meets the performance tests in this Standard for a polymer that is similar; and
(b) long-term heat-aging tests are conducted as covered in UL 746B or C22.2 No. 0.17, using elongation as the primary property.

1.2
Tubing is intended for use only in air - in dry and damp locations - as part of the internal wiring of electrical devices and appliances in accordance with the Canadian Electrical Code, Part I (CE Code, Part I) and ANSI/NFPA 70, National Electrical Code (NEC). It may be used for insulating one or more inadequately insulated conductors, bus bars, motor leads, transformer leads, terminal lugs, or small assemblies of electronic components. Tubing is not intended for use in contact with sharp edges, corners, or projections, or where subject to tension, compression, or repeated flexing. Tubing is not intended for use where it is feasible to employ a standard insulated conductor (appliance-wiring material) intended specifically for the purpose.

1.3
These requirements do not apply to fabric tubing, chemically dilated tubing, polymeric tubing extruded with reinforcement, or tubing intended only for mechanical protection.