top of page
Instructions for wiring safety isolating transformer
  • This transformer must be installed by a qualified electrician
  • Installation must conform to the latest IEE Wiring Regulations (BS767 1: 2008)Input cables: Select a suitable 3 core (L,N,E) cable with Blue, Brown and Green/Yellow inner cables/ cores.
  • Remove the terminal cover plate and pass the cable through the cable gland close to the terminals marked 0V, 240V and the green Earth terminals.
  • Wire the Blue core to the terminal marked 0V, wire the brown core to the terminal marked 240V and the green / yellow core to the Green/ Yellow (Earth) terminal.
  • Output wiring: Calculate the output voltage required.There are 5 output voltage options on the transformer.
  • The approximate load of the transformer is 10 Amperes.
  • Feed the selected twin out put cable through the second cable gland and connect one core to the 0V of the output and the other core to one of the tappings (previously selected depending on voltage drop i.e. cable size and length used).
  • The optimum on-load voltage for prolonged lamp life is 11.5V.Tighten all the connections / terminals ensuring each wire is correctly trapped in the terminal block do NOT apply excessive force.
  • Tighten the cable glands to the point where the cables are held firmly.
  • Replace the lid and test.
Note: The input of the transformer is fitted with an anti surge T type 5 x 20mm 3.15Amp fuse. In the event of fuse failure always replace with the correct fuse. The transformer is double wound, Class 1 construction. This transformer is designed to run in an ambient temperature range of -10 to +40 Deg C. Output voltage is DIRECTLY PROPORTIONAL to input voltage e.g. if mains voltage is 240V and the 11V tapping is selected the output will be 11V (allowing for regulation). If the mains voltage is 252V (+4%) the output on the 11V tapping would be approx 11.55V (allowing for regulation).
bottom of page