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Wiki Electrical Installation Guide

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Electrical Installation Guide Summary

General rules of electrical installation design 

This category presents the general rules for designing an installation and presents the involved IEC standards. It gives help in calculation of installed power loads.

Connection to the MV utility distribution network 

This chapter presents the main methods of connection to the MV utility distribution network.

Connection to the LV utility distribution network

This chapter presents the main methods of connection to the LV utility distribution network.

MV & LV architecture selection guide 

Given a particular building, we show how to select the right solution during pre-design and budget step: find a compromise between costs and ratings of the installation during its whole life cycle.

LV Distribution

Conception rules of an electrical installation. System earthings.

Protection against electric shocks 

This chapter explains how to determine protective devices in order to protect people from direct & indirect contacts and to protect equipments and goods from fire risks.

Sizing and protection of conductors 

Practical methods for conductor sizing and protection are given.

LV switchgear: functions & selection 

The basic functions of LV switchgear are described, as well as the selection rules for ensuring the protection coordination.

Protection against voltage surges in LV

The effects of lightning are described. Protective devices are proposed and implementation rules are given.

Energy Efficiency in electrical distribution

Power monitoring and control system contributes to global "energy efficiency". Such a system is of high benefice for the owner of an electrical network.

Power factor correction and harmonic filtering

This chapter explains how power factor correction is implemented in LV electrical installation. Practical examples are given.

Harmonic management

The origin and effects of harmonics are described. Measurement and filtering methods are proposed.

Characteristics of particular sources and loads

Specific sources and loads are studied: generators, inverters, induction motors, lighting circuits, LV/LV transformers...

Photovoltaic installations

Residential and other special locations

The specific intallations rules applicable to residential premises and some other locations are presented.

EMC guidelines

This chapter describes the basic rules for ensuring EMC: earthing principles, cable lay-out, wiring recommandations.


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New content on Ultra Rapid circuit breaker

UR figure 4.jpg
As installed power increases, electrical distribution has to shift from a LV design to a HV design. Indeed, a high short-circuit level can be a threat to the installation and make impossible the selection of low voltage equipments (Switchboard and bus bars, circuit breaker…)

These situations can be met in the following applications:
Bus bars coupling onboard merchant vessels, off shore platform, loop networks (in industry), where the current and energy are important because of the installed power (several transformers or generators in parallel) and HV design not easy. <more>

Electrical protection against surges

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6 pages dedicated to electrical protection against surges have just been fully updated.
In addition to describing the operation of the surge arrester, the emphasis is on the method of choice and their location in the architecture of the electrical installation. Similarly the security of the facility is an essential element; coordination table between the arrester and its short circuit protection device is proposed. This is the result of extensive studies and tests in laboratories conducted by specialists which expertise is about short circuit breaking and lightning electromagnetic phenomena.