[UK-CONTEST] shack design

[Contesting]

Quoting from the message of Tue, 28 Mar 2006 20:52:38 +0100 from "Paul
Beecham" <paul at prolectric.co.uk> :


> On Earthing, the big mistake is when two or more earthing systems are used 
> in the same property and the risk that a lethal potential difference
> between 
> these could occour. For example , you run power into a shed at the
> bottom of 
> the garden, your main house earth is under the stairs via the supply 
> authortiy , ( there are different systems   tns, tncs etc all forms of
> pme.) 
> You plug your rig into the 13A socket outlet, perhaps your aerial is an end 
> fed wire which is tuned against ground. You have an earth cable
> connected to 
> the earth lug on the back of the rig  and connected to ground via an earth 
> spike just outside the shed. Here is where it all goes horribly wrong, that 
> earth spike could cause a lethal potential difference to occour, it could 
> effect dissconnect times of the supply voltage. The standard advice is to 
> have only one earthing system in your property and take only earth 
> connections from that point. ( This is often not achievable especially with 
> this shed model ) and probably useless anyway in terms of  RF because of 
> impedience issues. There are ways to achieve this with the use of a TT 
> system  rcd's and earth spikes TIED together but all works of this nature 
> will effect electrical safety and must be undertaken by properly qualified 
> people and tested to the current regs.with the appropriate test
> certificate, 
> I hope this is of help. 73 Paul G6PZ
>

Is this not where it is acceptable to remove the Mains earth from any RF
generating equipment [marking the plugtops accordingly] and then use an
RF earth alone ?

Graham

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