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earthing [2025/07/12 11:47] – created m0lteearthing [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 ====== ====== 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 ===== ===== 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. 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]] 
 + 
 +There is loads of stuff about earthing online. Anything non-specific to the UK you should automatically disregard in the UK. There is also plenty of bad hearsay advice floating around in the UK amateur community - the latest RSGB guides are reasonably good and worth a read. 
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 +As always, if in any doubt, employ a qualified electrician. 
 + 
 +===== Lightning ===== 
 + 
 +Also see BS EN 62305 
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 +https://www.jac.ie/wp-content/uploads/pdf/Guide%20to%20BS%2062305%203rd%20edition.pdf
  
 ===== General information ===== ===== General information =====
  
 {{ :motorola_r56_2005_manual.pdf | Motorola - Standards and Guidelines for Communication Sites (R56) - 2005 }} (commercial) {{ :motorola_r56_2005_manual.pdf | Motorola - Standards and Guidelines for Communication Sites (R56) - 2005 }} (commercial)
earthing.1752320846.txt.gz · Last modified: by m0lte