Ask The Trades - minor electrical installation works certificate

theduck

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minor electrical installation works certificate
Mar 21^st, 2005, 6:11pm

can anybody please help me complete this?.

What wording goes where the dots are on the minor electrical installation works certificate?

Part 4 declaration

"BS 7671:................(IEE Wiring regulations)"
and
"amended to ............................... and that"

I would be really grateful for your help.

Also when doing a earth loop inpedance test should the equiptional bonding be connected? I have two books which contradict each other. One says it shouldn't be disconnected for the test and the other says it should be connected. Which one is right?

Once agaian i would be grateful for your help as this is driving me up the wall trying to find out.

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Beanzy GDPR opt-out Total Thanks: 0 For This Post: 0	Re: minor electrical installation works certificat Reply #1 - Mar 21^st, 2005, 8:06pm 2001 2004 For Ze loop; not connected.
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Stoday

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Re: minor electrical installation works certificat
Reply #2 - Mar 22^nd, 2005, 2:40am

[quote author=theduck link=1111428702/0#0 date=1111428702]
One says it shouldn't be disconnected for the test and the other says it should be connected. Which one is right? [/quote]

Both say the same thing. "shouldn't be disconnected" is the same as "should be connected" - double negative is a positive.

Opposite to what Beanzy says. Wink

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« Last Edit: Mar 22^nd, 2005, 2:41am by Stoday »

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Beanzy GDPR opt-out Total Thanks: 0 For This Post: 0	Re: minor electrical installation works certificat Reply #3 - Mar 22^nd, 2005, 4:40am Ze = external loop impedence. If you leave the earth connected to all those paralell paths which may or may not be in place all the time (ie if the plumbing gets re-worked) then how well have you measured external loop impedence?
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dingbat Trade Member Offline How hard can it be? Posts: 2822 Total Thanks: 2 For This Post: 0 Gender: Trade: Electrician	Re: minor electrical installation works certificat Reply #4 - Mar 22^nd, 2005, 7:46am Beanzy's quite right. As for the dates BS 7671 : 2001 refers to the latest edition of the regs, which have now been amended twice, the latest being in March 2004.
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Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8815 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: minor electrical installation works certificat Reply #5 - Mar 22^nd, 2005, 8:03am Yea, we always put mar04 as the ammended to date. Ze, disconnect the bonding. Zs, leave it in place. You just said earth loop, so unsure if you are meaning Zs or Ze?
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LSpark

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Re: minor electrical installation works certificat
Reply #6 - Mar 22^nd, 2005, 10:33am

With ref to dates, 2004 is sufficient, I don't bother putting march..

Quote:

Ze, disconnect the bonding.
Zs, leave it in place

Whilst this is quite correct, if you cannot isolate the installation when doing you're Ze, you should not disconnect the main earth, the test should be conducted on the main earth whilst it's connected to the main earthing terminal

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« Last Edit: Mar 22^nd, 2005, 10:34am by LSpark »

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Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8815 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: minor electrical installation works certificat Reply #7 - Mar 22^nd, 2005, 10:58am And a limitation noted. A cert with this as a limitation wouldn't hold much water, in my opinion.
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LSpark Global Moderator Trade Member Author Offline Posts: 8069 Total Thanks: 3 For This Post: 0 London, UK United Kingdom Gender: Trade: Electrician	Re: minor electrical installation works certificat Reply #8 - Mar 22^nd, 2005, 12:13pm better than nothing lecc.. if you disconnect main earth leaving the installation with no means of suitable earthing and something fault's you're going to have more worries than a limitation on test..
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Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8815 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: minor electrical installation works certificat Reply #9 - Mar 22^nd, 2005, 12:17pm Yea, I meant arrange a day when you can.....
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LSpark Global Moderator Trade Member Author Offline Posts: 8069 Total Thanks: 3 For This Post: 0 London, UK United Kingdom Gender: Trade: Electrician	Re: minor electrical installation works certificat Reply #10 - Mar 22^nd, 2005, 12:58pm and if it can't be done at all?
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Beanzy

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Re: minor electrical installation works certificat
Reply #11 - Mar 22^nd, 2005, 1:18pm

If it can't be done, then you're most likely in a commercial installation or such like, so you'll get the original comissioning manuals for the installation copy it out, then measure with it all in situ. If all looks correct then you'll provide that info as "by enquiry" and note the source and you readings on the cert. For your calcs you'll use the original unless it looks higher than the measured..... in which you'll code 3 it on a PIR so they get you to check out why their earthing has deteriorated.

If you're in a domestic situation and they lust want to keep the radio on, then you'll tell them not to be such ponces and throw the isolator Wink

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Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8815 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: minor electrical installation works certificat Reply #12 - Mar 22^nd, 2005, 1:43pm Top marks to beanzy. I would still strive to get an accurate reading.
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LSpark Global Moderator Trade Member Author Offline Posts: 8069 Total Thanks: 3 For This Post: 0 London, UK United Kingdom Gender: Trade: Electrician	Re: minor electrical installation works certificat Reply #13 - Mar 22^nd, 2005, 2:45pm Quote: I would still strive to get an accurate reading what should the accuracy of the instrument be to comply Lecc?
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Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8815 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: minor electrical installation works certificat Reply #14 - Mar 22^nd, 2005, 3:14pm With out my GN3 to hand (I am home with a cold.......again ) I will have to guess a little.... From memory the accuracy has to be within 5%. The meter must be able to sustain at least a 20amp test current. How did I do
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santacruz GDPR opt-out Total Thanks: 109 For This Post: 0	Re: minor electrical installation works certificat Reply #15 - Mar 22^nd, 2005, 3:28pm If Ze cant be done then by Enquiry?
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LSpark

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Re: minor electrical installation works certificat
Reply #16 - Mar 22^nd, 2005, 3:52pm

[quote author=Lectrician link=1111428702/0#14 date=1111504482]With out my GN3 to hand (I am home with a cold.......again Angry

) I will have to guess a little....

From memory the accuracy has to be within 5%.

The meter must be able to sustain at least a 20amp test current.

How did I do Grin

[/quote]
Wondered why you was on and off more than usual Grin

5% sounds about right, 25A minimum iirc

Quote:

If Ze cant be done then by Enquiry

ooo, santacruz is going where no man has gone before! Grin

Yea you could do, but be on the phone along time Roll Eyes

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