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CONTENTS

TN system

A system having one or more points of the source of energy directly earthed, the exposedconductive-parts of the installation being connected to that point by

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Jarek Wityk 2023-02-05 No Comments

Subject to Simultaneous Overload

Where circuits are grouped, there are two availablemethods of calculating the rating factor Cg to be applied: [BS7671:2018,Appendix 4,5.1.2:Equation 2] [BS7671:2018,Appendix 4,5.1.2:Equation 3,4]

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Jarek Wityk 2023-02-05 No Comments

Soil Thermal Resistivity

Relates to the ability of the soil, in which the cable is installed, to conduct heat energy away from the cable. The rating factor Cs

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Jarek Wityk 2023-02-05 No Comments

Residual Current Device (RCD)

AResidual Current Device (RCD) is amechanical switching device or association of devices intended to cause the opening of the contacts when the residual current* attains

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Jarek Wityk 2023-02-05 No Comments

Rating factors

Rating factors are divided into the nominal rating of the circuit protective device (In) to determine theminimum current-carrying capacity (Iz) of a cable in a

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Rated current

Value of current used for specification purposes,established for a specified set of operating conditions.

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Power factor

Power factor is the ratio of the resistance (R) and impedance (Z) in a circuit, that is:Power factor = cos ∅ =R/Z

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Max Zs

Themaximum value of earth fault loop impedance (Zs) that will allow the protective device in a circuit to disconnect an earth fault within the prescribed

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Jarek Wityk 2023-02-05 No Comments

k Factor

Factors for conductor materials from BS7671:2018,Table43.1. Different values are given for different types of conductor and insulatingmaterials. k2s2 used in adiabatic calculations gives the short-time

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