It depends
Hello,
You are after two things: vertical security; and lateral security. The vertical component is easiest, as you just need to keep the wires from drifting out of the spreaders on the leeward side (or being torn out in a knockdown). Many spreaders have end caps built-in for this purpose. If not, you'll need to drill a hole an inch or so inboard, to square-lash around the wire. The tougher challenge is to hold the spreader vertically, so that neither knockdown, nor a human standing on the spreader, nor downward vector loading can cause it to collapse. We use multiple double Constrictors for this, snapped very tight, stacked in a row, for this. Nylon seine twine. Note that some end caps will also compress on the wire, making the twine unnecessary. Avoid cable clamps here, at all costs.
Fair leads,
Brion Toss
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