MV Cable Ampacity Calculator | Kewo Engineering

Cable

Library

Catalog cables: loading

Voltage class System voltagekV Conductor Size Construction Insulation Insulation level Normal / emergency temp. Neutral / shield Catalog item Installed as

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Cable details

Installation

Installation Soil temperature°C Soil thermal resistivity°C·cm/W Sun In direct sun Depth to centre of top conduit rowft

Duct bank layout

Rows Columns Spacing, horiz.in Spacing, vert.in

Click a conduit in the cross-section to change what it carries.

More installation settings

Concrete envelope

Cover around conduitsin Concrete resistivity°C·cm/W

Thermal backfill

Cables in a thermal backfill envelope Cover around cablesin Backfill resistivity°C·cm/W

Conduit dimensions

Leave blank to use the standard dimensions for the selected conduit.

Soil drying

Model soil drying around hot cables Dry resistivity°C·cm/W Drying starts at°C Load-cycle depth Dxin

Sun

Solar radiationW/m² Surface absorptivity

Method

Rating method Conductor resistance FrequencyHz

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Load profile Daily load factor Hours per day at full currenth

Short-time emergency rating

Durationh Preload, % of normal rating%

These set the short-time emergency figure only; the normal rating does not change.

Existing circuits

Set a cable to a known current to model existing circuits; the other cables are rated around them.

Cross-section

Results by conduit

Calculation steps IEC 60287 hand calculation for the hottest conduit

Inputs and cable data

Cable

Installation

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Ratings by circuit

Cross-section