Section 356.10(5) Uses Permitted

356.10 Uses Permitted. LFNC shall be permitted to be used in exposed or concealed locations for the following purposes:

Informational Note: Extreme cold can cause some types of nonmetallic conduits to become brittle and therefore more susceptible to damage from physical contact.

(1) Where flexibility is required for installation, operation, or maintenance.

(2) Where protection of the contained conductors is required from vapors, liquids, or solids.

(3) For outdoor locations where listed and marked as suitable for the purpose.

(4) For direct burial where listed and marked for the purpose.

(5) Type LFNC shall be permitted to be installed in lengths longer than 1.8 m (6 ft) where secured in accordance with 356.30.

(6) Type LFNC-B as a listed manufactured prewired assembly, metric designator 16 through 27 (trade size ½ through 1) conduit.

(7) For encasement in concrete where listed for direct burial and installed in compliance with 356.42.

Analysis of the Change

Section 356.10(5) was revised to permit Type LFNC-A (Thomas & Betts) and Type LFNC-C (PMA) to be used in lengths longer than 6 feet. Earlier editions of the NEC, Section 356.10(5) only allowed Type LFNC-B (Carflex) to be used in lengths longer than 6 feet.

Additional Revisions or Expanded Uses for Types LFNC-A and LFNC-C:

(1) 356.30 Securing and Supporting, was revised to include the Types LFNC-A and LFNC-C for the supporting requirements when lengths over 6 feet are used.

(2) 680.27(A)(2) Wiring Methods, was revised to include all types of LFNC as an approved wiring method for specialized pool equipment.

(3) 695.6(D) Pump Wiring was revised to include all types of LFNC as an approved wiring method for controllers to the fire pump motor.

(4) 695.14(E) Electric Fire Pump Control Wiring Methods was revised to include all types of LFNC as an approved wiring method for control wiring for electric motor-driven fire pumps.

(5) A new chart showing the nominal diameter and area based on wire fill was added to Table 4 in Chapter 9 for Type LFNC-C.

(6) Tables C.7 and C.7(A) were added for to the Informative Annex C, Conduit and Tubing Fill Tables for Conductors and Fixture Wires of the Same Size for Type LFNC-C.

Products

All types of Liquidtight Flexible Nonmetallic Conduit (LFNC) and fittings.