IEC 60287 PDF

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IEC Standard | Calculation of the continuous current rating of cables ( % load factor). ument IEC the current carrying capabilities of power cables can be mathematically modelled. Current rating of power cables can hence be done without. IEC Electric cables – Calculation of the current rating – Part Current rating equations ( % load factor) and calculation of losses – General.

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IEC 60287 Current Capacity of Cables – Rated Current

Just another thing I’ve just noticed still easy to figure out because of unexpected results in the section “Buried cables where drying-out of the soil is to be avoided”, AC part, in the numerator, it should be a subtraction instead of an addition. A quick Google search will turn up several software programs capable of performing the calculation. Depending where you live, local regulations will have different limits The standard gives the following equations for the calculation of the cable current rating for all alternating current voltages and direct current up to 5 kV:.

I need to use your calculation but there is a mistake with the factorisation of the denominator in the formula for buried cables where drying-out of the soil occur for AC cable.

Autonomous Vehicle Challenge Two driverless and solar power vans have departed from Italy on their way to China via the silk road. However, a step by step working through it approach will enable the current carrying capacity to be calculated.


IEC Fault Calculations. Insulating materials have dielectric losses, alternating current introduces skin effect, sheath and eddy current losses, several cables are simultaneously producing heat and the surrounding materials are non-homogeneous and have boundary temperature conditions.

Calculating Cable Performance a. Calculating Cable Performance d. The complexity of these rooms varies considerably depending on location, function and Google Sheets – Electrical Functions. Symbols – Circuit Breakers. As an overview, the standard looks at the following situations: Thanks for the feedback. Standard Wire and Cable Sizes.

One topic per page All topics one page Export Print Email. I’ve modified the drying out equations slightly. Dielectric loss in cables. Introduction to Current Transformers Current transformers CTs are used to convert high level currents to idc smaller more reasonable level for use as inputs to protection relays and metering My view is that you should used the equations to select the cable based on your anticipated current rating.

Current transformers CTs are used to convert high level currents to a smaller more reasonable level for use as inputs to protection relays and metering Symbols – Fault Calculations.

IEC 60287 Current Capacity of Cables – Introduction

IEC Reference Designations The IEC publishes a series of documents and rules governing the preparation of documents, drawings and the referencing of equipment. If you exceed this value of current, you could be affecting the life of the cable. For details, please refer to the first note in 660287 serieswhich lists the other related notes.


In the note we are going to put everything together and reveal the necessary equations for actually calculating the cable maximum current rating. The standard is applicable to all alternating current voltages and direct current cables up to 5kV. BS Voltage Drop Calculation.

As the cable heats up rate of heat dissipation will increase. I 2 R ‘ The heat flow watts per unit length from the conductor is given by: Comments are closed for this post: Cable Sheath and Armour Loss.

I dont know how i can thank you for the great information’s you provide,and its really appreciated. Derating Factors – cables grouped in air. If you have a load current which is genuinely varying, iwc could use IEC “Calculation of the cyclic and emergency current rating of cables. Within the standard this above is used to derive the equations for current rating.

> IEC Current Capacity of Cables – Introduction

In this instance the current capacity should be evaluated for each type of installation condition and the worse case taken. Change in temperature across a material is equal to the heat input multiplied by the thermal resistance of the oec. Steven McFadyen Steven has over twenty five years experience working on some of the largest construction projects. Economic Optimisation of Cables.