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Hi There Does anyone know why there should be no more than a 1% volts drop on the DC cable from the array to the inverter ? And what affect on the system a higher volts drop of say 3 % may have ? Cheers

GN8 advises that you should avoid non electrical services such as pipework as a means of support . The reason it gives is so that they are able to withstand mechanical damage and any factors likely to result in detrition . Also see 543.3.1 of regs .

I belive the test you are discussing above is a test to confirm a bonding connection between extraneous conductive parts , where required . My original question was how to test that ■All extraneous conductive parts in the location are effectively connected to the protective...

Cheers

Yea thats a bit of a tricky situation . The reason they are asking you to provide a certificate from the original installer is because they would have been assessing / testing the electrical installation as it was installed . They are also responsible for the original design . The problem...

Hi I have read this thread = //www.diynot.com/wiki/electrics:speclcn:supbond17th It says that sup bonding may be omitted if 3 things are met , the 3rd been if = ■All extraneous conductive parts in the location are effectively connected to the protective equipotential bonding...

Hi There I have been asked if i can wire so as to shut off the power to a socket circuit when the fire alarm goes off . I am thinking to do this by installing a contactor next to the DB and switch it from the fire alarm panel . I know that the panel has a normally closed circuit in it...

Thanks Found the table i have been after in this publication on the NJUG web site . http://www.njug.org.uk/publication/63

gn7 Table 11A - Is infact for Highway authoroties services . But the scope of the section says that it applies to any street furniture installations , public or private , including car parks , private roads etc The car park i am working in is privately owned but is used by the general public...

Thanks , another great answer , but where are you getting this info from please . I have a copy of the IEE guidence note 7 and the colors it says to use in TABLE 11A are different than the ones you have told me ? Im getting realy confused now , LOL

I was planning on using a contractor to dig it for me , i just need the info to give to them so they can give me a price .

Thanks very much for the reply , but could you tell me where i could find this info please ? I have a copy of the old guidance note 7 on special locations , and that states that normally cables buried DIRECT 450mm below verges or 750mm below carriageways will have adequate protection . I...

Not sure as i dont work for NIC , but it may be because you can get diffent size skirting board . Iv worked in houses with boards ranging form 2" to about 8 " . What ya think ?

Hi can anyone help please ?? I have to bury a cable under the ground to feed a lamppost i am installing . I have to cross a grass verge , a tarmac foot path and also part of a car park . I have found out that i need to put the SWA cable i am using within an orange ducting and place a...

Not when what you wrote was/came across as incorrect information :roll: Is that the best you can come back with when ive just completely stripped you down ? Dont make me laugh ! Or go on then :lol:

Well done you ! , but nobody asked that , and i certainly didn't say it was / wasn't did i ? :idea: If you had taken a bit more time to read my post , you would have seen that i never went in to the reason that sup bonding was / is required ! I was saying that under the 17th edition...

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It seems to have gone way beyond that now , besides i got the answer i wanted 3 posts in ! :) And this is much more fun than boring electrical talk ! 8)

Because its my JOB ??? :D :D :D