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Discuss Earthing Arrangements Explained + Photo's in the UK Electrical Forum area at ElectriciansForums.net
Just shows you how long that service fuse has been in place. My parents house only had a 40A service fuse and a 40A meter for donkeys years. Then got updated out of the blue to 60A fuse and 100A meter. Later still, Mechanical meter replaced with digital meter and fuse/tails uprated to 80A/16mm....[/QUOTE]
and it held for all that time....
which begs me to ask what the point in this excercise was?
Non of your Chinese rubbish!
hmm..What happened to Brush Engineering?
I had the misfortune of installing one of their LV panels. Biggest pile of junk I’ve ever come across. So bad I got division engineering involved and we chucked all the outgoing switches away. Replaced them with System 4 gear.
I've got a fantastic book, 'Diesel Traction. Manual for Enginemen', 1962, great book.
Also got one for 'Railway Steam Locomotive Enginemen'. More of Geordie's era.
Just shows you how long that service fuse has been in place. My parents house only had a 40A service fuse and a 40A meter for donkeys years. Then got updated out of the blue to 60A fuse and 100A meter. Later still, Mechanical meter replaced with digital meter and fuse/tails uprated to 80A/16mm....
and it held for all that time....
which begs me to ask what the point in this excercise was?
it would have been interesting to have clamped the tails at full demand back then...No idea, no upgrades were ever asked for/requested. Not just my parants house, but the whole estate, street by street!! lol!! Talking about a period from 1952 through to 2005. It was around final year, they changed the meter for a digital one and upgraded the service fuse and the braided VIR 7/064 tails for 16mm....
theres six of these in existance:I have that one and I have "2750 - Legend Of A Locomotive" which is a fictional story about an A3 Class Gresley Pacific named "Papyrus" that I've seen many times written by H.C. Webster. (I think I have some for diesel as well but let's not go there!)
I first stumbled upon it in the school library and was so impressed with it I wanted to nick it!
It's a very rare book and a couple of years ago the idea popped into my head that I would like to read it again but nobody had ever heard of it. Somehow, by fair means or foul, Tidyboiler managed to find a copy for me.
It's so well written with some great drawings that it's possible to learn to drive a Gresley Pacific class from it and that's how at the tender age of 18 I ended up driving this:
it would have been interesting to have clamped the tails at full demand back then...
and again recently...
compare the results......
I have that one and I have "2750 - Legend Of A Locomotive" which is a fictional story about an A3 Class Gresley Pacific named "Papyrus" that I've seen many times written by H.C. Webster. (I think I have some for diesel as well but let's not go there!)
Somehow, by fair means or foul, Tidyboiler managed to find a copy for me.
Right you are, not to assume.
After obtaining some temporary seals from the DNO I looked inside the carrier and this is what I found.
Brush
30 Amp
60 LR
Certified
440V AC 4
BS88 - 1952
Class 3
Made in England
The print on the fuse had faded so there may be errors in the above info.
The DNO were contacted again and they're sending an engineer to address the issue.
Probably still TNCS yes, so long as it is not one of the cast iron heads that have the earth tagged to the headI always put in 33kA... For main fuse.
i was working at a house yesterday and the earth was going into fuse , but not normaly where it goes to link at side... Would you still say YMCA
A BS88 fuse has a minimum breaking capacity of 50kA, unless it is a new BS88-3 when the breaking capacity will be 33kA.
emm? just wondering why?Does the sheath not need to be bonded too? I cant make out the writing on the service head,how do we know this presumably later conversion to TNC-S hasn't been done on the fly by mr diy sparky. I was thinking it could be left in place to be sure to be sure.If you have a neutral connected to an installations earth terminal (eg PME/TNC-S) then the incoming supply cables metallic sheath connection must be disconnected. Especially important where a supply cable is suppling both TN-S and TNC-S earthing arrangements!! eg, ....where the DNO cable is in the process of being PME'd....
I think these overhead earthing systems are being done away with due to copper theives leaving the rural customer without an earthJust because you asked Archy
How it was explained to me at the EMEB collage.
Around each of the earth rods there will under earth fault conditions be a voltage gradient in the ground. In order for the MV and LV to be interconnected the LV earth electrode must be <2Ώ. Higher and the site is referred to by the DNO as hot and no direct MV→LV earth connection is allowed.
Therefore the LV earth has to be moved away from the MV equipment earth. This is to prevent a MV earth fault migrating to the LV system.
My drawing for OH supply
DNO drawing for ground mounted
emm? just wondering why?Does the sheath not need to be bonded too? I cant make out the writing on the service head,how do we know this presumably later conversion to TNC-S hasn't been done on the fly by mr diy sparky. I was thinking it could be left in place to be sure to be sure.
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