Electrical Myth busting!

[pencilpusher]

First of all, Happy New Year to everyone...................

Now, having had a thread attract a scaremongerer this week about the "myth" of extending a PME suppy to an outbuilding, I am very interested to hear about electrical myths others have heard of and would like to share. (This is a serious thread to collate myths about electrical can and cannot do's - no other myths are welcome!) Maybe we could compile a list of the top ten electrical myths at the end.

I will start then - You cannot export (extend) a TNCS supply to an outbuilding ..........or else!

Over to you.......................

 

[Engineer54]

I know you were Hawky ...lol!! Happy New Year to you mate!!

 

[firemanowl]

£150 for a board change is the going rate!!

 

[Sintra]

EICR's done in 30 minutes. PAT testing 5p per item.

Nothing fails.

 

[Ponty Massive]

R1 + R2 can be calculated by measuring Zs then subtracting Ze

 

[ruston]

Everyone in the wholesaler's know the regs inside out.

 

[jase]

BS7671 is the law, and anyone who is not qualified cannot be an electrician.

 

[D Skelton]

It is illegal to pull the DNO fuse.

 

[D Skelton]

You must always fit triple pole isolation to bathroom extractor fans.

 

[Deleted member 26818]

All socket-outlets require RCD protection.

 

[MarkieSparkie]

The RCD myth triumvirate:
1) When using an RCD as the protective device, the earth fault current is "automatically" limited to the rated residual current of the RCD.
2) In a TN system if Z[SUB]s[/SUB].I[SUB]Δn[/SUB]<=50V the touch voltages attained during an earth fault will not exceed 50V.
3) The rated residual operating current of an RCD intended to provide fault protection only must not exceed 30mA.

 

[davelerave]

if it works -it's ok

 

[ackbarthestar]

What does this mean?

VIR ( rubberinsulated) cable . might be perished at ends, where the air has got to it. doesn't mean the whole cable is shot.

Vulcanized Indian Rubber - Its what Spock and Mr Zulu used to refit the wrap drive on the Starship 'Enterprise'

 

[telectrix]

condoms on the Enterprise? whatever next?

 

[La Poste]

It is bad practice to loop in and out with a neutral at the switch

That's certainly NOT a myth!! lol!!

I was waiting on you E54 lol

Is it bad practice then, terminating all the neutrals in the switch?
My boss does it all the time.

 

[Hawk81]

Without starting the whole debate again do a search on the forum for neutrals at switches you will find a lovely big debate on it.