UL 1569:2001 pdf download – UL Standard for Safety for Metal-Clad Cables.
13 Armor
1 13.1 The cable shall be enclosed in metal armor that is applied directly over the nonmetallic coveting described in 12.1 — 12.9. On a round cable, the cross section of the armor shall be round and the armor shall consist of interlocked steel or aluminum strip, a corrugated copper-alloy tube, or a smooth or corrugated aluminum-aloy tube. On a fiat cable, the cross section of the armor shall be rectangular and the armor shall consist of a corrugated aluminum-alloy tube. In any case, the strip or tube shall be conbnuous throughout the entre length of the cable. The strip may be spliced but there shall not be any cut or broken ends. Tube armor shall not have any weld openings, cracks, splits, or other defects
2. 13.2 The strip shall be made of an aluminum-base alloy with a copper content of 0.40 percent or less, or of steel. Steel strip shaM be made corrosion-resistant by a coating of zinc (see 16.1 — 16.12) on all surfaces, including edges and splices. The coating on each surface shall be evenly distributed, shall adhere firmly at all points, and shall be smooth and free from blisters and all other defects that can diminish the protective value of the coating.
3. 13.3 The strip shall be uniform in width, thickness, and cross section and shall not have any burrs, sharp edges, pits, scars, cracks, or other flaws that can damage the underlying or any covering elements of the cable. Splices shall not materially Increase the width or thickness of the strip nor shall they lessen the mechanical strength of the strip or adversely affect the formed armor.
4. 13.4 The thickness of the stnp is to be measured before forming. Measurements are to be made by means of a machinist’s micrometer caliper having an anvil and spindle that are round and are not larger than 0.200 inch or 5.1 mm in diameter, with flat surfaces on each.
5. 13.5 Oeleted August3l.1999
6. 13.6 The dlmensaons of aluminum or steel strip from which Intertocked armor Is formed, the thickness of smooth aluminum-tube armor, and the thickness and number of corrugations per unit length of corrugated copper-tube and aluminum-tube armor are not specified. These items are to be judged on the basis of the performance of the finished cable fri the tests specified In this Standard.
Table 13.1 deleted August 31, 1999
14 CoverIng over Armor
1. 14,1 A covering is required over the interlocked, smooth, or corrugated armor of a cable that is marked Isee 38.1(j)J for direct burial. In the case of a cable that is not marked for direct burial, a covering Is acceptable over the armor but Is not required.
14.2 Any covering that Es over the interlocked, smooth, or corrugated armor — whether that covering is required or not – shaM consist of a PVC, CP, CPE, neoprene, XL, NBR1PVC, or PE jacket applied directly onto the armor (see 12.15 for the long-term evaluation of a jacket matenal not named in this paragraph or not complying with the short-term tests specified for the material). The armor shall be completely covered and well-centered in the jacket. The jacket on a round cable shall be round in cross section. The jacket on a flat cable shall be rectangular in cross section. The outer surface of a jacket on a smooth armor shall be smooth. Impressions ofthe convolutions or corrugations in the outer surface of the jacket shall not show depressionscaused by unfilled spaces between the convolutions or corrugations. The jacket shall comply with14.6 and, in the case of a cable marked for direct burial, the cable shall comply with the crushingtest requirements in 26.1 -26.6.
2 14.3 Specimens prepared from samples of the jacket taken from the finished cable shall
14.2 revised August 31,1999
exhibit physical properties that are not lower than indicated in the applicable one of the twelve.