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About John Ward
Electrical theory, experiments and demonstrations. New videos every week. Support this channel and watch early on Patreon. More free content at flameport.com
Recent Videos from John Ward
TT Installations
Some of the considerations when installing an electrical installation with a TT supply.
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… Racal-Guardall 1980s PIR Sensor Teardown - Compared with Modern Equivalent
What's inside a 1980s Racal-Guardall RLC1S PIR motion sensor. No instructions or details but most likely a 12 volt device which connected to a dedicated lighting control unit. Uses a segmented mirror to focus IR from the environment onto the sensor.
Also a look inside a modern self contained 230… ConduDisc Final Tests - 4 Months Later
Testing the Condudisc and ConduCrete four months after installation. This was installed in April, this video made in August.
Original test result 19.9 ohms, new 16 ohms, roughly 20% reduction in resistance. Weather for the last several weeks has been very dry.
Previous videos:
Overview and Dem…
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