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I have this spike guard and it's middle led is ON even when the spike guard switch is off. I can see there are various combinations of the led and their meaning. But I see the middle led on when the switch is OFF. Can anyone tell me if anything is of concern here?

enter image description here

iwtga
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    Weird. LEDs 101 = All OK so 010= not OK? maybe ground and Neutral reversed or noisy ground? – Tony Stewart EE75 Jul 31 '20 at 19:05
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    Does a filled circle mean on or off, that's the question. – Tom Carpenter Jul 31 '20 at 19:07
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    it's the top row ... all OK – jsotola Jul 31 '20 at 19:10
  • It isn't......the bulbs should glow..they do glow as 101 when the spike guard is ON.the image I have attached is when the Spike Guard is OFF – iwtga Jul 31 '20 at 19:11
  • Maybe 010 is normal for switch power off (?) – Tony Stewart EE75 Jul 31 '20 at 19:13
  • Idk..I turned off the main FUSE of my circuit board to see if the middle led still glows, and guess what? IT does glow as 010! I'm scared – iwtga Jul 31 '20 at 19:14
  • no need to be scared. Plug in a light with power off to verify. not shown but 010 must be normal for PWR SWITCH OFF but Pwr avail to turn ON then 101 when ON then Fuse blown ON when removed with 101 – Tony Stewart EE75 Jul 31 '20 at 19:16
  • This is how it looks like when the SWITCH is ON. It looks like 101 but the middle 0 is a bit glowing so 111? Doesn't make sense? [Image][1] [1]: https://imgur.com/gallery/6LLRa7P – iwtga Jul 31 '20 at 19:20
  • I'm adding some more information idk if it's needed. My brother has observed when he charges his laptop and the spike guard has the middle led ON he gets electrocuted when he touches metal parts of his laptop. I have experienced the same with USB devices when plugged to the computer. – iwtga Jul 31 '20 at 19:27
  • Read the fabulous data sheet. We're not a support group for electrical products you might have bought ten years ago. – Andy aka Jul 31 '20 at 19:37
  • It's not even a year since my parents bought it:_( I'm not worried about the spike guard, I'm worried if my house wiring is screwed – iwtga Jul 31 '20 at 19:38
  • @TomCarpenter Seems to be [filled-in = on](https://i.imgur.com/2XwHRuG.png) as you'd expect. – Spehro Pefhany Jul 31 '20 at 19:50
  • Is the device connected to earthed/grounded outlet? Does the laptop charger have 2-prong ungrounded plug or 3-prong grounded plug? – Justme Jul 31 '20 at 19:59
  • @Justme it's a 3 pin. Grounded. – iwtga Jul 31 '20 at 20:00

2 Answers2

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This is how the indicators would be connected.

enter image description here

And this would be the logic.

enter image description here

Instead of indicators 2 & 3 coming on for 'Line / Neutral Reverse', only indicator 2 would come on with the switch in the 'off' position.

That appears to be a design oversight!

vu2nan
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This sounds like normal behaviour.

010 for Power Off
101 for Power On not 111. thats just optical crosstalk

The laptop leakage is normal 0.5mA RF leakage filter to earth ground on the charger to reduce EMI and is safe. but if user is earth grounded and DC charger is floating , there is transformer RF leakage to DC where you can feel electricity in a small spot like your wrist or knee but not whole hand.This is current limited by safe Plastic HV capacitors from line and Neutral to ground and series inductors to limit the RF noise current and block 50 / 60 Hz line voltage. So it is the harmonic noise that is being felt. This is normal. To avoid it connect laptop to earth gnd thru external LCD or just insulate yourself a bit better with socks.

Tony Stewart EE75
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