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Frequently Asked Questions
What makes a conduit hanger specific?
The clip, which holds a round section of a particular size.
It has to grip without deforming the conduit.
The cable and gripper are the same as the rest of the family.
Only the end fitting changes.
Clip size follows the conduit's outside diameter.
Matching the clip to the actual conduit is the whole selection.
What sets the support spacing?
The electrical installation rules, not the hanger manufacturer.
Conduit has published maximum support intervals.
They depend on material, diameter and whether the run is horizontal or vertical.
Unsupported conduit sags and strains its couplings.
It can also pull out of a box.
The wiring regulations for the jurisdiction set the figures.
Is extra support needed anywhere?
At changes of direction and at boxes, generally.
A bend concentrates load.
A box adds weight at a point.
Both are common places for a run to fail.
Applying spacing uniformly without regard to what is in the run misses them.
Regulations typically require support within a stated distance of each.
Does conduit material change anything?
Considerably - steel and PVC behave differently.
Steel is heavy and rigid and needs support for weight.
PVC is light and flexible and sags between supports.
PVC also expands and contracts with temperature.
Long runs need expansion provision as a result.
Gripping a PVC run rigidly everywhere prevents movement the design intended.
Does earthing matter here?
On metallic systems, yes.
Steel conduit sometimes forms part of the earthing arrangement.
Mechanical support should not compromise it.
Dissimilar metal contact can drive corrosion at the clip over years.
Corrosion at a joint affects both mechanical and electrical continuity.
Matching materials or isolating the contact addresses it.
What sets the load limit?
The weakest component in the assembly, frequently the anchor.
Cable, gripper, clip and anchor each have their own rating.
Anchor performance depends on the base material.
Conduit full of cable is heavier than empty conduit.
Calculating the loaded weight rather than the conduit alone matters.
Local safety factors apply on top of the published capacity.
Do seismic or fire requirements apply?
In many jurisdictions, to electrical containment specifically.
Wire suspension resists gravity rather than sway.
Bracing against lateral movement is a separate provision.
Services forming part of a fire strategy may need certified supports.
Requirements differ substantially between markets.
The local code governs rather than the suspension manufacturer's catalogue.