Differences

This shows you the differences between two versions of the page.

--- earthing [2025/07/13 10:35] – m0lte
+++ earthing [2025/08/10 21:42] (current) – Emphasised difference between RF and mains earth, and advice on not just making mains earth connections 2e0kgg
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 ====== Earthing ======
+**Do not conflate [[https://en.wikipedia.org/wiki/Ground_(electricity)#Radio_frequency_ground|RF earth ("counterpoise")]] with [[https://en.wikipedia.org/wiki/Ground_(electricity)|electrical earth]]**
 ===== Resources specific to the UK =====
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 An insulated wire laid on the ground makes a good RF earth. It conducts (couples) RF into the ground fairly effectively, but insulates at mains AC frequencies and DC, up to very high voltages.
-It is not advised to make extraneous connections between your radio equipment and mains earth. Many ham radio DC power supplies explicitly isolate the DC negative pin from the mains earth connected chassis. Test it with a multimeter to be sure.
+**It is not advised to make extraneous connections between your radio equipment and mains earth**. Many ham radio DC power supplies explicitly isolate the DC negative pin from the mains earth connected chassis. Test it with a multimeter to be sure.
 The authoritative source for wiring regs in the UK is BS 7671 - also known as the IET Wiring Regulations. Unfortunately it is not freely available. As of July 2025, we are up to 18th edition amendment 3, with amendment 4 likely 2026. [[https://electrical.theiet.org/bs-7671/ensure-you-are-up-to-date-with-bs-7671/|More info]]