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Frequently Asked Questions
How does a wire suspension gripper hold?
It wedges the cable against a taper, so load tightens the grip rather than loosening it.
The cable is pushed through and locks at whatever height it reaches.
A release lever lets it back out for adjustment.
There is no cutting, threading or measuring on the ladder.
Adjustment happens at the bottom, within easy reach.
That is why wire replaced threaded rod for most light overhead work.
How do I choose between the kits?
By what is being suspended, because the kits differ only in their end fitting.
The cable and gripper are the same across the family.
A hook suits a light fitting; a strut clip suits channel.
A duct band suits ductwork, and the band shape follows the duct section.
Conduit clips suit conduit.
Choosing on the termination is faster than comparing cable diameters.
What sets the working load limit?
The weakest part in the assembly, which is frequently the anchor rather than the cable.
Cable, gripper, end fitting and anchor each have their own rating.
The assembly is limited by the lowest of them.
Anchor performance depends on the base material as much as on the anchor.
Safety factors are set by local code and by the manufacturer's tables.
Where the two differ, the stricter requirement applies.
Can one cable length cover different drops?
Yes - that is much of the appeal.
The gripper locks anywhere along the cable's length.
One stock length therefore suits a wide range of heights.
Excess cable is cut off after the drop is set.
That reduces the number of items to carry and to stock.
It also means a run of suspended services can be levelled after everything is hung.
How is the top end fixed?
Into the structure, with an anchor suited to the material it goes into.
Concrete, steel beam, timber and profiled deck each take different anchors.
The anchor is frequently the limiting component in the assembly.
Fixing into the wrong base material is the commonest installation error.
Beam clamps avoid drilling steel where drilling is not permitted.
Pull testing is required for some anchor types and some applications.
Do suspended services need bracing?
In many jurisdictions, yes - a wire in tension does nothing against sway.
Seismic requirements commonly call for lateral and longitudinal bracing.
Wire suspension resists gravity and not horizontal movement.
Bracing components are specified separately from the suspension kit.
Requirements differ substantially between markets.
The local code governs rather than the suspension manufacturer's catalogue.
Does fire performance matter?
Where the service forms part of a fire strategy, it matters a great deal.
Supports may need to survive a stated fire exposure period.
Steel cable loses strength at temperature like any other steel.
Systems tested and certified for the duty are specified in those cases.
Ordinary suspension kits are not a substitute for a certified system.
Which services fall under this is a local regulatory question.
What about corrosion?
Specify the finish for the environment rather than defaulting to the cheapest.
Indoor dry conditions suit standard galvanised cable.
Damp, external and coastal conditions call for stainless steel.
Swimming pool and chemical atmospheres attack many stainless grades too.
Mixing metals at the fitting can drive galvanic corrosion.
The gripper and end fitting need the same consideration as the cable itself.
Can the cable be re-used or re-adjusted?
Adjustment is straightforward; re-use depends on the cable's condition.
The release lever allows the drop to be reset at any time.
Cable that has been kinked, crushed or corroded should not go back in.
Grippers can wear where they have been released repeatedly under load.
Inspecting both before re-use takes moments.
Given the cost, replacing rather than re-using is usually the sensible call.
How many hangers does a run need?
By the support spacing the service itself requires, not by the cable.
Conduit, tray, duct and pipe each have published support intervals.
Those intervals come from the service's own standard or code.
The suspension kit then has to carry the resulting load per point.
Joints, bends and heavy fittings usually need additional support.
Spacing set by eye is the reason sagging runs get re-done.