Electrical Installation Specialising in the electrical installation of office and retail interiors, J.J.E.S. Limited has successfully completed countless office fit-outs in its 17 year history, and we have retained every one of our clients for any alterations, upgrades or maintenance they require on their sites. A free site survey and quotation come as standard, as well as a proposed electrical design layout if requested. Maintenance and Testing As well as any electrical installation, electrical maintenance is equally as important, whether it be any alterations or upgrades to the existing installation, general maintenance, a 5 yearly Periodic Test & Inspection, Emergency Lighting or Portable Appliance Testing, J.J.E.S. Limited can attend to all your electical requirements.