LV Power Distribution Design


1-day course

CPD Credit: 7 hours, C1

Course Overview

This course provides an overview of the design of low voltage power distribution systems for buildings.

The aim of this course is to give electrical engineers an understanding of the principal aspects of LV distribution design with particular emphasis on design and selection of the LV switchgear system.

This course will benefit electrical engineers and contractors involved in the supply chain of electrical services for buildings.

Learning Objectives

At the end of the course, attendees will have learned

LV Distribution System – Typical applications

Awareness of the main standards relative to LV switchgear

How to design LV distribution boards

How to select appropriate protective devices

How to select the Power Factor Correction Equipment

Course Programme

Part 1 – Design of the LV Distribution System - Typical Applications

Residential / Apartments

Office Block

Industrial Premises

Mission critical sites with UPS and Generator systems

Part 2 – LV Switchgear Standards

Overview of IEC Standard 61439 Part 1 &2

Overview of ETCI - “Code of Practice” LV Switchboards ET201: 2005”

Other Publications

Part 3 – Design of Main LV - Switchboards

Enclosure, compartmentation, form of separation, degree of protection

Busbars compartments, clearance and creepage distances

ESB metering compartments

Protective devices - Switchfuses, MCCBs and ACBs

Protective devices - Coordination and Discrimination

Automatic transfer switches - ATSs

Mechanical and electrical interlocking of switches and breakers

Surge protection devices - SPDs

Double ended main LV switchboards

Approximate sizing of LV switchboards

Part 4 – Design of Final Distribution Boards

Cabinet type distribution boards

Pan assembly type distribution boards

Consumer unit type distribution boards

Final circuit protective devices: MCBs, RCBOs etc.

Part 5 - Busbar Trunking Systems

Lighting busbar trunking

Main power busbar systems

Tap off boxes and final power connection to load

Part 6 Power Factor Correction Equipment

Power factor analysis

Calculation of VARs

Capacitors, reactors, detuned systems

Reactive power regulator

Trainer’s Profile

Brendan Dervan is a Chartered Engineer with over 40 years’ experience in all aspects of mechanical and electrical building services including design, installation, commissioning and maintenance. After completing an electrical apprenticeship in 1982 he went on to study electrical engineering in DIT.

He has worked in M&E consultancy at senior engineer / director level since 1990. In 1999 he started his own M&E consultancy, Dervan Engineering Consultants (DEC), which merged with Cundall in 2016. His Company provided M&E consultancy and project management services to a diverse range of clients in both the public and private sectors. In 2013, Brendan completed an MSc in Energy Management with TU Dublin. His thesis researched the improvement of energy efficiency in existing data centres.


  • “Happy with the course. Brendan has vast experience in this area, and it came across in the training. He had the ability to explain the subject in clear and concise manner.”
  • “Very enjoyable”
  • “Very good training course. Thank you”
  • “It was amazing for understanding the concept for LV Power Distribution Designing”
  • “The course was excellent. The whole experience was very good. Brendan is very knowledgeable and brought good, practical experience to the course. Overall, well worth doing and really enjoyable.”
  • “Very educational course and very well organized by Elva and presented by Brendan.”
  • “Very informative & articulately presented. Good to see a Consulting Engineer's perspective on what he is looking for from the Panel Manufacturer” 

Please contact the Team for further information on scheduled course dates and In-Company options. You can reach us by phone: 01 665 1305 or email