UL 1696:2021 pdf download.STANDARD FOR SAFETY-Mechanical Protection Tubing (MPT) and Fittings.
UL 1696 applies to nonmetallic or composite mechanical protection tubing (MPT), and nonmetallic, composite or metallic fittings, and clamps used for the support, routing and mechanical protection of conductors, wires, and cables. The MPT, fittings, and clamps are intended to be used to interconnect separate component assemblies or consoles of electrical devices, such as robotics, medical or X-ray equipment. The mechanical protection afforded the internal wiring contained within the tubing is considered equivalent to the protection provided by a type SJT flexible cord. Mechanical protection tubing (MPT) may be submitted without fittings, clamps, etc.
1.2 The MPT, fittings, and clamps covered by this Standard are not intended for use as a wiring method in accordance with NFPA 70, National Electrical Code (NEC), CSA C22.1, Canadian Electrical Code (CE Code), Part I and NOM-O01-SEDE Standard for Electrical Installations.
1.3 This Standard does not include standard trade sizes. The MPT, fittings, and clamps from different manufacturers are not interchangeable unless the combination of MPT, fittings, and clamps are determined to be in accordance with this Standard.
2 Normative References
2.1 Where reference is made to other publications, such reference shall be considered to refer to the latest edition and all amendments published to that edition up to the time when this Standard was approved.
ASTM* Standards
ASTM D 2444
Standard Test Method for Determination of the Impact Resistance of Thermoplastic Pipe and Fittings by
Means of a Tup (Falling Weight)
ASTM D 5025
Standard Specification for Laboratory Burner Used for Small-Scale Burning Tests on Plastic Materials
ASTM D 5207
Standard Practice for Calibration of 20 and 125 mm Test Flames for Small-Scale Burning Tests on Plastic
Materials
ASTM D 5423
Standard Specification for Forced — Convection Laboratory Ovens for Evaluation of Electrical Insulation
ASTM G 155
Standard Practice for Operating Xenon Arc Light Apparatus for Exposure for Nonmetallic Materials
* American Society for Testing and Materials.
ANCE/MEXICAN Standards
NMX-J-017-ANCE
Conduit, Tubing and cable Fittings — Specifications and Test Methods
3.3 Connector — A fitting intended to terminate, secure, and support MPT to an enclosure, equipment or
similar device.
3.4 Coupling — A fitting intended to securely connect two lengths of MPT.
3.5 Fitting — A device, such as a coupling or connector, that provides a means for securing MPT to an enclosure, splicing between lengths of MPT, or securing MPT to equipment that maintains the support and protection of the MPT.
3.6 Composite Fitting — A fitting constructed of both metallic, other than screws and the like, and nonmetallic materials.
Note: The presence of screws, nuts, washers and unexposed metallic sleeves for screws should not be the sole means to change the classification of a fitting from “nonmetallic” to wcomposite.N These components generally are not likely to become energized in the event of a conductor fault so they are not subject to the test in 6.13 and a protective coating is not measured in accordance with
6.14.2.
3.7 Metallic Fitting — A fitting constructed completely of metallic materials.
3.8 Nonmetallic Fitting — A fitting constructed completely of nonmetallic materials.
Note: See note in 36.
3.9 Mechanical Protection Tubing (MPT) — An enclosed channel of nonmetallic or composite construction that is intended to be repeatedly flexed throughout its life.
3.10 Composite MPT — A tubing constructed of nonmetallic material with a rigid metallic reinforcement.
3.11 Nonmetallic MPT — A tubing constructed completely of nonmetallic materials.
3.12 Working Temperature — The temperature to which the MPT is subjected during its intended use.UL 1696 pdf download.