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Even the simplest things..... (Patreon)

Published:
2022-12-27 02:53:40
Imported:
2023-02

Content

This is particularly annoying, and a good example of how many products are made by small companies using standard components without realising how subtle differences can be dangerous.

Perhaps the manufacturer of the plastic adaptor does a specific bayonet cap version without the side tag, but the person who assembled this just assumed it would fit any similarly sized metal base.

Aside from potentially leaving exposed live metal, this adaptor can introduce a very insidious neutral/earth fault into a wiring system that can have weird RCD/GFCI tripping effects on unconnected circuits.

https://www.youtube.com/watch?v=-M0ENypBnUA

Files

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Another interesting example of people making products without understanding what they're doing. In this case it's a simple lamp adaptor with a built-in design fault that can make the shell of a bayonet cap lamp-base live. If the adaptor is used in a plastic ungrounded holder this won't be noticed, but it does pose a shock risk due to exposed metal. If the adaptor is put into an earthed/grounded socket then it will either bridge live or neutral to earth. That will either result in instant RCD/GFCI tripping if live is bridged to earth, or unpredictable tripping if neutral is connected to earth. When neutral is bridged to earth it can result in some of the neutral current bypassing the RCD and causing an imbalance. That results in the RCD/GFCI issues when a load reaches a specific level, even on other circuits. It can be quite hard to trace, because turning off single pole circuit breakers will not remove the neutral to earth short. Mid-play video-adverts are annoying in technical videos, so I don't enable them. If you appreciate that and enjoy my content then you can help support the channel with a contribution of a dollar or two a month on Patreon. That also lets you critique the (advert free) videos before they are released, gives a more direct means of communication with me and also gives access to the regular relaxed Patreon live streams. https://www.patreon.com/bigclive #ElectronicsCreators

Comments

Seán Byrne

I had that experience with a B22 Lighting Ever brand LED bulb 9 years ago - Tested it in one room and worked fine, then tried it in another with a metal lampshade and blew the lighting circuit fuse. No spare 6A bottle fuse that evening either (we've since upgraded the consumer unit to circuit breakers). Thinking it might be a faulty light socket, I tried it in a table lamp and it tripped the RCD. Finally tested with a multimeter and sure enough one pin was connected to the bayonet cap.