Recent content by ambrougham

I'm not an electrician (but am qualified electrical/electronic engineer) and even on DIY electrics I would most definitely NOT skip what I consider to be essential safety tests and never have done even when there wasn't really a specific requirement to do them. However, I'm not in the least bit...

However, how can anyone even suggest that their design/installation is satisfactory and safe without performing tests on it ? I would agree that in some instances it might be possible to argue that experience shows that certain factors aren't a problem and can therefore be guaranteed either by...

Sorry for maybe appearing to be a smart@rse but this was starting to really wind me up ! Looking at doing it you're way, I think you have either dropped a clanger or I've lost the plot somewhere :?

Supply Voltage: V = 240 /0 Power Factor: PF = cos(Phi) Supply current: I = 10 /-Phi Total Impedance: Z = V/I Impedances in parallel: 1/ZT = 1/Z1 + 1/Z2 + 1/Z3 .... Assuming a parallel combination of a resistance R with inductive reactance XL (lagging PF): I/V = (10 /53.1) /...

Sounds spot on to me .... they certainly don't enjoy putting in baby's arm sized cables to supply you particularly when you aren't paying for the power that you're appently using either so will therefore *encourage* you to install PFC .... one way or another ! However, I must say that 400uF...

So how about this one dragged up from the depths of memory of years (very much) gone by: If a load draws a current of 10A from a 240V 50Hz supply with a power factor of 0.6 lagging, what value capacitance should be used to bring the power factor up to near unity ? ....... erhm, and heres...

Nope ! 2/10 please see me :P You haven't taken into account the resistance of the coil - the calculation you have done is only correct for an inductor with zero resistance. I = V / (R + jXL) which comes out as 6.7A /-57.5

That's obviously the comment or a very similar one (regarding their right to request relevant documentary evidence) that I have seen before. In a word ... NO ! At least not in my area anyway. The last time I looked (some weeks ago) the form for a Building Plans or Notice Application still...

YET ! My money is on changes being made to the effect that they will no longer *have* to do any inspection, testing or certification etc. of any work directly (or by way of a sub-contract arrangement) but will be allowed to instruct the applicant to provide such documentary or test evidence...

Here, perhaps http://cgi.ebay.at/ws/eBayISAPI.dll?ViewItem&item=5962343980&ru=http%3A%2F%2Fsearch.ebay.at%3A80%2Fsearch%2Fsearch.dll%3Ffrom%3DR40%26satitle%3D5962343980%26fvi%3D1 ;) There's always good old eBay for all your "Hedi Gummi Verlängerungskabel" needs :P Pure guess would be...

Slight hijack but might be a relevant answer to the original question. Would fitting a switched FCU in place of an existing cooker switch or connection unit (asuming a single sized 45A plate in an appropriate position) and leaving the cooker cct MCB at 32A or higher be considered acceptable ...

Yeah, I know it does seem well OTT doesn't it but probably has to be the best option in this situation :) That one's only 2" and I know they do wider although the cables could obviously be bunched (with any appropriate derating etc) but the run of 13(ish) cables spaced 1D apart requires around...

I've been pondering on this one also as I'm planning a major sort-out of a whole load of problems (aka disasters various just waiting to happen.) Below the suspended ground floor, ye olde cables are run in virtually every direction possible, generally just laying on the earth but also...

Nooooooo !!!! think I'll pass on that :lol: although I don't think there is anything unduly wrong with my metering so wouldn't have a problem if one was fitted. Do the maths and it stacks up with what was recorded and pretty much matches my guesstimate beforehand as well. Also I would put...

Ah yes, probably should have posted a geek alert warning label or something before I posted all that shouldn't I ! - but it's not quite so bad as it first seems .... honest :D One PC acts as a web/ftp server, receives faxes and also performs a variety of logging, monitoring and control...