UL 4-2021 pdf download – Armored Cable.
7.5.2 The condition of the interior of armor is to be determined by removing the conductor assembly from a short length of the finished cable and by looking through the armor from one end and then the other. An incandescent electric lamp with a clean, frosted bulb is to be at the end of the tube opposite the examiner. 7.6 Bonding strip 7.6.1 Armored cable shall have an uninsulated bonding strip located between the conductor assembly and the armor throughout its entire length. The bonding strip, which enhances the grounding ability of the interlocked armor, shall be of aluminum and shall not be smaller than 16 AWG. 8 Bushings 8.1 The construction of armored cable shall be such that an acceptable insulating bushing or its equivalent protection can be inserted readily between the conductors and the armor at each termination of the armor. 8.2 To determine whether or not armored cable complies with the requirement in 8.1, a 2-inch or 50-mm length of armor is to be removed from one end of a length of cable. If it is intended that a fibrous covering is to be removed before a bushing is inserted, such covering shall be removed manually from the conductors. If the bushing can then be inserted readily between the conductors and the armor so that the flange on the bushing comes in contact with the cut end of the armor, and if it remains in that position after pressure is removed, the construction is acceptable. 8.3 Insulating bushings supplied with armored cable, shall be intended for the purpose and shall be of a readily distinguishable bright color such as red, orange, or yellow. At least 35 bushings shall accompany each 250-ft or 75-m length. PERFORMANCE TESTS 9 Continuity of Conductors 9.1 All of the circuit conductors and any grounding conductor in armored cable shall be continuous throughout. Finished cable shall be tested for continuity of each 14 – 10 AWG conductor by the cable manufacturer at the cable factory.