EleCanada
Cable tray geometry

Cable tray area calculator

Compare supplied round-cable areas with a supplied usable rectangular tray area. The result is a geometric ratio, not a tray selection or installation approval.

Calculation inputs

Tray and cable dimensions

Usable tray section
mm

Enter the clear inside width available for the cables, not the nominal trade size or outside width.

mm

Enter the usable section depth for this geometric comparison. No catalogue capacity is assumed.

Cable group 1
mm

Use the overall outside diameter for the actual cable construction.

Enable JavaScript to edit cable groups and calculate.

Area occupancy

Enter the clear tray section and at least one complete cable group.

The result is an area comparison only. It is not an allowable fill percentage, compliance decision or evidence that the cables fit in the tray.

What it calculates

Enter the clear rectangular area available in a tray section and one or more groups of round cables. Each cable group uses its actual overall outside diameter and quantity. The calculator compares the sum of circular cross-sectional areas with the supplied rectangular area.

This does not complete cable tray fill or tray selection. It does not supply a permitted occupancy percentage, use a tray catalogue, or decide whether cables can be placed in a layer or arrangement.

Method and example

For each group, circular cable area is π × (outside diameter ÷ 2)². Multiply by group quantity and sum all groups. Usable tray area is the supplied inside width multiplied by the supplied usable section depth. The reported geometric ratio is total cable area divided by usable tray area, multiplied by 100.

For a 300 mm by 50 mm clear section, four 10 mm cables and two 20 mm cables have a combined circular area of approximately 942.478 mm². The supplied rectangle is 15,000 mm², so the area ratio is approximately 6.283%. This number describes only those geometric inputs.

Limits

The rectangle is user-supplied; the calculator does not determine a listed tray's available area. It does not model cable arrangement, cable spacing, multiple layers, bend space, entry/exit geometry, material loading, support span, temperature, grouping, cable weight or manufacturer conditions.

Do not compare this percentage with a code limit or use it to select a tray. Confirm the applicable Canadian requirements and the specific tray and cable manufacturers' installation data for the actual job. Mixed cable constructions must be entered using matching product outside diameters. Non-round cables are outside this model.

Common questions

Can a result above 100% be shown?

Yes. It reports the ratio of the supplied areas without capping the result. A ratio above 100% means the summed circular areas exceed the entered rectangle; it still does not simulate packing or declare a code result.

Can I enter nominal tray size?

Enter the clear usable inside dimensions for the comparison. Nominal designations and outside dimensions do not establish internal area.

Does this calculate allowable cable-tray fill?

No. Applicable rules, tray construction, cable configuration and installation conditions need a separately reviewed method. This tool reports a geometric area ratio only.

For cable packaging or raceway layout tasks, these tools calculate separate quantities.

Cable reelEstimate round-cable reel capacity and loaded mass.Conduit bendLay out supported offset, segment and saddle marks.Voltage dropEstimate voltage loss or maximum distance from supplied impedance.

Source

The geometry uses the circle-area relation A = πd²/4 and the rectangle-area relation A = width × depth. The page labels the supplied dimensions and resulting ratio as geometry; it does not derive them from a Canadian electrical code or tray manufacturer's capacity table.

Report a problem or suggest a source. The cable groups are not included automatically.