3 Phase Installation & Maintenance Three phase, when you require a little more from your power supply.

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0203 6090 804

Your trusted Electricians in London that specialise in:

Three Phase installations ✔
Motors and Pumps ✔
Heating Ventilation & Air conditioning (HVAC) ✔
Three phase bus bar systems ✔
Three phase consumer unit installation ✔
Load balancing and phase analysis ✔
Three Phase dish washers ✔
Three Phase cookers and stoves ✔
Three phase heating ✔

NICEIC Approved

NICEIC is an abbreviation that stands for National Inspection Council for Electrical Installation Contracting. The NICEIC is a voluntary organisation owned by a corporation called the Electrical Safety Council. They are a company that protect customers in the UK from unsafe and un-sound electrical work.

We are proud to be approved by the NICEIC

Local Electricians

All of our London electricians are highly skilled with many years of experience in trade; they can undertake a variety of work with confidence.

They are also certified and fully qualified to the 17th edition of BS7671 (electrical regulations), and are required to keep up to date with changes in the regulations and improvements in technology.


Simple and affordable with a rate of just £75.00 for the 1st hour and £37.50 per ½hr thereafter.

Don't get mislead by other companies, with hidden charges, our prices have and will always be transparent, we charge what we say!

Click Here for a complete list of Nimrod Electrical Rates

Three phase power is a common form of electrical power supply for larger electrical installations and a popular method of electric power transmission throughout the national grid system.

Three phase power is usually installed in larger properties including commercial and industrial properties.

Some electrical equipment consumes larger amounts of energy, this can be achieved through increasing the voltage, a 3 phase supply achieves this through using multiple live wires adding their voltage to each other, the types of equipment that use 3 phase power to achieve this include the following:

  • Air conditioning
  • Heating
  • Motors and pumps
  • Heavy machinery
  • UPS systems

Electricity supplied to smaller and domestic properties is usually delivered via one live (phase) wire, this will supply power at around 230 volts (although this can be in excess of 240 volts and sometimes higher than 250 volts) this type of power requires a neutral conductor (wire) to work as it is assumed that electricity moves from wires that have higher voltages to wires that have lower voltages, and neutral conductors should always be at zero volts, allowing power to move through the circuits in your home 

A three phase supply utilises three live wires, the voltage that exists between either two or all three of these live wires is 400 volts, this voltage used to be 415 volts but was reduced to 400 volts to harmonise with European standards. 

Three phase systems also typically employ a neutral wire. Because most electrical devices are single phase items and are rated at 230 volts, it is necessary to provide a neutral conductor for these items to function, this includes any device that plugs into a 13-amp socket outlet.

Phase balancing is an important consideration when installing a three phase system - this is where each of the phases have as near as possible, equal amounts of current flowing in the conductors. 

When phases are out of balance voltages can exist in the neutral conductor where the voltage should be at zero. 

Other issues that can be encountered when the phases are out of balance is that one conductor exceeds its capacity, causing the fuse to blow, while other conductors are well below the threshold to blow. Rearranging the loads to balance out the system can usually bring the system into harmony and remove the overloading issues. 

Your supply company is likely to charge for the installation of three phase power, and this can run into many thousands of pounds, but once it is installed the price per unit is the same as that for single phase power, unless a lower price has been negotiated with the supply company.

To arrange for a three phase power supply to be installed can take many months depending on local availability and other considerations determined by such factors as is it necessary to dig up the pavement or road, and how this will impact on the public, traffic flow and the movement of the emergency services.

An application form will need to be submitted, with a set of plans of the local area and another of the building into which the 3 phase supply will be brought into, its final position should be marked on these plans, which is usually local to the distribution system of the building.

It must be taken into account that three phase consuming devices are usually items that require more power, which is why the power is spread over three separate conductors rather than just the one.

Whether you need a new three phase power supply to be installed or additions & alterations or advice about your existing three phase installation, such as balancing the loads, then Nimrod Electrical can bring to you our expertise and experience for advice, call us on 00203 6090 804.


Proud to be accredited with the following organisations

niceic ap

niceic di


city and guilds


Nimrod Electrical Contact Details

Nimrod Electrical Contact Details

269a Coombe Lane, West Wimbledon
London SW20 0RH

Office: 0203 6090 804
Mobile: 07527 323 759

Office: 0207 0600 999
Mobile: 07702 249 959
Registered Office

Railview Lofts
19c Commercial Road
Eastbourne  BN21 3XE

Company No: 6444740

Work can be carried out in normal working hours, evenings and weekends. Job bookings will be scheduled at a time to suit you.
Emergencies will be booked immediately and an operative will be with you within one hour, subject to availability and traffic condition.

Emergency Electrician London is a trading name for Nimrod Electrical

Work can be carried out in normal working hours, evenings and weekends. Job bookings will be scheduled at a time to suit you. Emergencies will be booked immediately and an operative will be with you within one hour, subject to availability and traffic condition.

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