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Mains/Grid Isolation and Surge Protection

A whole house surge protector/surge arrester is installed to provide additional protection from transient overvoltages originating from the mains/grid supply. A whole house surge protector is installed directly inline and as close as possible to the incoming mains/grid supply meter, this allows for surge protection for all circuits and equipment including solar inverters, routers, stereos and other sensitive electrical equipment within the network. The addition of a 100Amp lockable isolator also allows for safe and convenient isolation of all electrical equipment within the network including consumer units, solar inverters, battery storage units and EV chargers from the mains/grid in one place.

Surge protectors are in compliance with the recently updated 18th edition amendment 2 of BS7671.

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AC Solar Surge Protector

Identifying the installation area:

We are looking for a space as close as possible to the incoming mains/supply meter. Ideally this will also be in a convenient place for you and anyone else that might need to isolate the electrical system from the mains/grid.

In the first instance, if possible please email us a picture or a few pictures of the incoming mains/grid supply meter's location, showing the space and equipment around it and let us know in an accompanying email or phone call where might be a good place for the isolator/surge protector to be installed. Electrical equipment and cables installed close to and connected to the incoming mains/grid supply meter can often be moved around without too much trouble and we will be happy to do this in order to find the right location for the mainswitch/surge protector.

We supply and install mainswitch isolators / surge protectors in two form factors:

  • Tall and thin: Height: 220mm, Width: 88mm, Depth: 79mm.
  • Square: Height: 185mm, Width: 130mm, Depth: 104mm.

Quotation Once we understand the installation area and what's needed for the installation, we will send you a quotation and let you know the earliest date from which the work can be booked in.

Book Installation: Engineers can usually be scheduled to start within 14 days, their names, phone number and the time of their visit will be known to you in advance.

Installation and Commissioning: We will have the grid/mains power supply off for the duration of the installation, depending on the amount of work involved, the installation and commissioning of a main isolator / surge protection unit would usually take between 2-4 hours. We will let you know at the time of quotation if we are likely to need more time than this.

Finishing: When the work is complete we will remove and dispose of any rubbish or packaging, recycling as much as we can.

AC Surge Protection and Isolation

Mains/Grid Supply Isolator/Main Switch and Surge Protection Summary:

Isolate the property's entire electrical system from the grid/mains in one place with built in surge protection

  • Designed to be installed inline with and close to the incoming mains/grid supply meter
  • Used to conveniently isolate the entire electrical system including consumer units, solar PV systems, EV chargers and energy storage systems from the mains in one place
  • Incoming AC surge protection protects all of the internal electrical system including solar PV inverters, energy storage units, routers, sound equipment and other sensitive equipment from transient overvoltages originating from the mains/grid
  • 100Amp, Rated Short Circuit Current: 25kA, Maximum discharge current: 40kA
  • Lockable isolator, suitable for meter tails up to 35mm
  • Type 2 Surge protectors with status indicators
  • Large metal case(s) - Available in 2 form factors, compliant with 18th addition, second amendment, BS7671

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Solar PV Surge Protection (DC Surge Protection)

DC Surge Protection Solar PV Systems

DC surge protection devices (SPDs) are installed between the solar panels and the solar inverter to protect both the solar inverter and the downstream electrical equipment from transient overvoltages of an atmospheric origin impacting the electrical system via the DC side of the system / the solar panels.

DC Surge protectors are in compliance with the recently updated 18th edition amendment 2 of BS7671.

Solar PV Surge Protection (DC Surge Protection)


Solar Power System Testing, Servicing & Maintenance

Regular solar PV system testing, servicing and maintenance will extend the life of a solar PV system and ensure that solar panels are always operating safely and at their best, whilst maximising yields.

We offer complete safety and performance testing for solar PV power systems of any size. Includes solar panels, cables, solar inverters, isolators and mains connections.

We provide solar power system testing and maintenance services for residential, commercial, industrial and agricultural clients across Southern, South West England and the West Midlands, with specialist experience working with farmers, developers and commercial and industrial buildings owners.

Solar Power System Testing, Servicing & Maintenance

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Articles: Further Information, Calculators & Solar Inverter Fault Codes

Lots of articles, calculators and technical information including links for further reading. Covering a range of topics related to the installation and maintenance of solar photovoltaic and electrical systems in the UK.

Solar PV Information Articles

Mains Power Supplies & Earthing Systems

mains power supply and Earthing Systems: Location & accessability, supply systems, earthing, bonding, labelling, installing RCDs.

How to provide power to a house using a portable generator

In this article we show you how to power your home using a portable diesel, petrol or LPG generator. We look at changeover switches, the importance of earthing, generator loadings, how to isolate non essential loads. We ask where to locate the generator when it's in operation, how best to safely isolate the mains power supply and switch to a generator supply.

Surge Protection for UK Solar PV Systems

Recent changes to the BS7671 UK Wiring Regulations 18th Edition in the form of amendment 2 have introduced requirements and considerations for surge protection on both the AC and DC side of a solar PV System. In this article we take a look at surge protection, particularly in the context of the updated UK wiring regulations and how surge protection could best be incorporated into new and existing solar PV systems installed in the UK

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What Our Customers Say:

"Outstanding. Conscientious, thorough, friendly and reasonably priced service. Highly recommended. Made our solar panel battery system safe, correcting the sub-standard work of others. Will always use this trustworthy PV electrician. Even after the work was completed, he studied the manual for our system and assisted with resolving further problems. Thanks Glen." Rob Barnes, Royal Wootton Bassett

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Case Studies

We've carried out Solar PV System design, installation, testing, repair and maintenance work on solar PV systems of all shapes and sizes all across the UK.

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Areas Served:

We are located in Wanborough, very close to Swindon in Wiltshire, Southern England, UK. From here we service clients within a 90 minute driving radius including the towns, cities and regions below:

Swindon: Abingdon, Aldbourne, Amesbury, Andover, Banbury, Basingstoke, Bath, Berkshire, Bicester, Blunsdon, Box, Bracknell, Bradford on Avon, Bridgwater, Bristol, Buckingham, Burford, Burnham on Sea, Calne, Camberley, Cardiff, Carterton, Cheltenham, Chippenham, Chipping Norton, Chipping Sodbury, Cirencester, Corsham, Cricklade, Devizes, Didcot, Evesham, Eynsham, Faringdon, Frome, Fleet, Glastonbury, Gloucester, Gloucestershire, Hampshire, Henley-on-Thames, Highclere, Highworth, Hook, Hungerford, Keynsham, Kingsclere, Lambourn, Lechlade, Ledbury, Ludgershall, Lyneham, Maidenhead, Malmesbury, Marlborough, Marshfield, Melksham, Minety, Newbury, Newport, Oxford, Oxfordshire, Pewsey, Purton, Ramsbury, Reading, Ross on Wye, Royal Wootton Bassett, Salisbury, Shaftesbury, Shalbourne, Slough, Southampton, Stow, Stratford upon Avon, Stroud, Swindon, Tewkesbury, Thatcham, Tidworth, Trowbridge, Wanborough, Wantage, Warminster, Weston Super Mare, Wiltshire, Winchester, Windsor, Witney, Wokingham, Worcester, Wroughton and Yate.

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