Tag: ohmeter

  • Changing A Mains Isolation Switch Neon Indicator

    Changing A Mains Isolation Switch Neon Indicator

    Intoduction You may notice how the indicator light in your mains sockets and switches dims with time and wonder why. These lights are usually small neon bulbs which glow when a small alternating current of 1 or 2mA passes through them. These bulbs are filled with neon gas which glows red when a current passes through…