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ENEnglish繁中繁體中文ESEspañolARالعربيةFRFrançaisITItalianoPTPortuguêsRUРусскийDEDeutschJA日本語VITiếng ViệtKO한국어THไทยTRTürkçe

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Engineering Calculator · 005

Oval Cable Diameter Calculator

Compare major and minor cable diameters, calculate ovality and estimate an equal-area circular diameter for early review.

Cable dimensions
Start calculationReview the method

Live calculation

Enter the known values.

Units remain visible beside every field and result. Change any input to recalculate immediately in your browser.

01

Inputs

02

Results

Mean diameter18mm
Equal-area diameter17.97mm
Ovality11.11%
Diameter difference2mm

Formula
Dmean=Dmajor+Dminor2D_{\mathrm{mean}}=\frac{D_{\mathrm{major}}+D_{\mathrm{minor}}}{2}Deq=DmajorDminorD_{\mathrm{eq}}=\sqrt{D_{\mathrm{major}}D_{\mathrm{minor}}}

The calculation runs locally in this browser. Values are not submitted or stored by this tool.

Direct answer

What this result means

An oval cable should be recorded with its major and minor diameters. This tool reports their arithmetic mean, the equal-area circular diameter and ovality. Those values describe geometry; they do not prove that a circular gland seal can accommodate the cable.

Oval Cable Diameter Calculator engineering relationship diagramThe equal-area diameter comes from equating the ellipse area πab with the area of a circle. Ovality is the diameter difference divided by the mean diameter. This dedicated schematic represents oval equivalent diameter and is not to scale.CABLE OVALITY · TOOL 005Major diameterMean diameter
Calculator-specific engineering relationship diagram — schematic, not a product drawing, and not to scale.

Formula & theory

Make the assumptions visible.

The equal-area diameter comes from equating the ellipse area πab with the area of a circle. Ovality is the diameter difference divided by the mean diameter.

Calculation relationship
Dmean=Dmajor+Dminor2D_{\mathrm{mean}}=\frac{D_{\mathrm{major}}+D_{\mathrm{minor}}}{2}Deq=DmajorDminorD_{\mathrm{eq}}=\sqrt{D_{\mathrm{major}}D_{\mathrm{minor}}}

The equal-area diameter comes from equating the ellipse area πab with the area of a circle. Ovality is the diameter difference divided by the mean diameter.

Variables

DminorSmallest perpendicular diametermm

Use sequence

From measurement to review

  1. Measure the cable across its largest and smallest perpendicular axes without crushing the sheath.
  2. Calculate the diameter difference, mean and equal-area diameter.
  3. Keep both original measurements—not only the equivalent value—when comparing the cable with a gland sealing range.

Limits

What this calculation does not confirm

  • The cross-section is approximated as an ellipse.
  • Local ribs, flats, armour and sheath softness are not modelled.
  • The major diameter remains the controlling clearance measurement for passage through a circular opening.

Related articles

More articles (2)

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Calculator FAQ

Use the number without losing the engineering context.

These answers clarify what the tool calculates and where a product-specific review still begins.

01Calculator guidanceHow does the oval cable diameter calculator apply ellipse and circle geometry?

The tool applies ellipse and circle geometry. It keeps the entered values, units and assumptions visible so the result can be checked or repeated.

02Calculator guidanceWhat engineering review can the oval cable diameter calculator support?

It supports a preliminary review based on ellipse and circle geometry. It does not select a final cable-gland model or confirm standards compliance, ingress performance or installation approval.

03Calculator guidanceWhy must that the two measurements are perpendicular and taken without squeezing the sheath be checked before using the oval cable diameter calculator result?

Verify that the two measurements are perpendicular and taken without squeezing the sheath; provide photographs or a section drawing for unusual profiles.

Product selection support

Connect the calculation with cable-entry product options.

Bepto Cable Glands can help relate a preliminary result to the product family and current model information for your application. You can start with the details you have; a complete drawing package is not needed to ask a question.

Request product support