OHS Code Explanation Guide

Published Date: July 01, 2009
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Part 21 Rigging

Section 300 Cable clips

Subsection 300(1)

Cable clips, also known as “cable clamps”, can be used safely for lifts up to 80 percent of line strength. Commonly used types include the U-bolt clamp (see Figure 21.11), the double-saddle clamp (see Figure 21.12) and the double-base clamp (see Figure 21.13). New bolts should always be used. Cable clips should be used in accordance with ASME Standard B30.26-2004, Rigging Hardware Safety Standard for Cableways, Cranes, Derricks, Hoists, Hooks, Jacks and Slings.

Figure 21.11 Example of a U-bolt clamp

Figure 21.12 Example of a double-saddle clamp

Figure 21.13 Example of a double-base clamp

“Never saddle a dead horse.” This means that the “saddle” part of the clip must not bear on the short or “dead” side of the rope (see Figure 21.14). Applying the clip incorrectly can reduce the effectiveness of the connection.

Figure 21.14 Example of “dead horse” clip

Subsection 300(2)

If the clips are tightened beyond specified torque values, the hoisting cable will be crushed and its strength reduced.

Subsection 300(3)

Double-saddle clamps can produce greater efficiency in the connection by applying a greater clamping force on the rope without damaging it.

Subsection 300(4)

Spacing of clamps should not exceed 6 to 7 times the diameter of the rope.