A 16-way wiring centre that provides a convenient and safe method of system wiring and all controls can be neatly connected so operational testing can be a simple task. It is easy to use, is suited to all popular heating systems, has large diameter wiring terminals, simplifies wiring and circuit testing, has cable identification and voltage warning label, is manufactured in flame retardant plastic, complies with BS EN60670-22, is manufactured in the UK and is supplied with cable clamps.