Discuss G78 in the UK Electrical Forum area at ElectriciansForums.net
N
Nightmare1308
-
- Joined
- Oct 16, 2012
- Messages
- 82
- Reaction score
- 8
- Location
- Cambs
- Feb 11, 2017
- #1
Is any one here educated on G78 regulations?
Finding it difficult to get information on it, Spoke to national grid and the DNO and neither are helpful on our side of the water.
NICEIC are also struggling.
Sort by dateSort by votes
T
The Ghost
- Feb 11, 2017
- #2
Upvote0Downvote
OP
N
Nightmare1308
-
- Joined
- Oct 16, 2012
- Messages
- 82
- Reaction score
- 8
- Location
- Cambs
- Feb 11, 2017
- #3
Vortigern said:
Hi thanks for repling.
I already have this and the other 4 areas for the networks but it doesn't specify our side of the install just there side.
I'm looking for the Earthing size needed from the Pylon to the MPBS as you are not allowed to use DNO earthing within the ROP ZONE.
Which then leads to needing to know the minimum size earth for all other extraneous and exposed conductive parts, on top of the platform/suspended floor.
Also the earthing size for the SA1,2,3 suppressors protecting the platform supply and load side, which also cannot be mixed in with the Pylon earth or the Rop zone depending on which side of the suppressor.
Currently using the 70mm AWG earth for whole site but nothing is specifically designed for us. Just wanted to know incase I'm over spec.
Upvote0Downvote
T
The Ghost
- Feb 12, 2017
- #4
To be honest this is an area I have zero knowledge or experience. I do think it is a bit crazy this area is not clarified by the equipment manufacturer. I guess if its from an overhead supply, or even if it is not you have considerations of lightining strikes as well. I was wondering if any of your team have any knowledge of that area or whether it might profit you to discuss that with one who does. Just a shot in the dark there!
Upvote0Downvote
OP
N
Nightmare1308
-
- Joined
- Oct 16, 2012
- Messages
- 82
- Reaction score
- 8
- Location
- Cambs
- Feb 12, 2017
- #5
Vortigern said:
To be honest this is an area I have zero knowledge or experience. I do think it is a bit crazy this area is not clarified by the equipment manufacturer. I guess if its from an overhead supply, or even if it is not you have considerations of lightining strikes as well. I was wondering if any of your team have any knowledge of that area or whether it might profit you to discuss that with one who does. Just a shot in the dark there!
Yes I fit lighting protection (LP) on all sites along side surge protection to conform to LP standards which is another book. As niceic said it's departure from BS7671.
I have a a bit of knowledge about it and what's expected from sites I've visited alot across the country but everyone I go to seems to be different and I want to know what's right and wrong.
it Just seems to be a grey area on somthing that's so dangerous.
I've chased the DNO and national grid as they own certain pylons but neither were any help. Guess I'll keep chasing until I find someone who knows. I'll ping and email to them all Monday morning.
Thanks for you honestly and help.
Upvote0Downvote
T
The Ghost
- Feb 12, 2017
- #6
http://www.spenergynetworks.co.uk/userfiles/file/OHL-02-015 Issue 2 - G78 COP- LV Supplies to Equip Assoc.pdf You got this one? Seems like you are right on with CSA of earth?
Upvote0Downvote
OP
N
Nightmare1308
-
- Joined
- Oct 16, 2012
- Messages
- 82
- Reaction score
- 8
- Location
- Cambs
- Feb 12, 2017
- #7
Vortigern said:
http://www.spenergynetworks.co.uk/userfiles/file/OHL-02-015 Issue 2 - G78 COP- LV Supplies to Equip Assoc.pdf You got this one? Seems like you are right on with CSA of earth?
No that's a different one to the one I got for them. That one makes more sense and it also come inside of bs7671 with the 35mm earthing on bonding size as specified in the regs saying no equipotencial earth shall ever need to be greater than 35mm.
Need to find the writer of the documents who made the standard as they should then know i hope.
Appreciate your help and time.
Thing is I've met other eletrician carring out the works and they said they don't even know and I would like to for my own sake.
Upvote0Downvote
T
The Ghost
- Feb 12, 2017
- #8
Yeh well best of luck with that. I think you are absolutely right you just can't be working blind on a project with those onerous voltages/dangers.
Upvote0Downvote
R
Roscoe
-
- Joined
- Aug 6, 2014
- Messages
- 3
- Reaction score
- 0
- Location
- United Kingdom
- Jun 18, 2020
- #9
Nightmare1308 said:
No that's a different one to the one I got for them. That one makes more sense and it also come inside of bs7671 with the 35mm earthing on bonding size as specified in the regs saying no equipotencial earth shall ever need to be greater than 35mm.
Need to find the writer of the documents who made the standard as they should then know i hope.
Appreciate your help and time.
Thing is I've met other eletrician carring out the works and they said they don't even know and I would like to for my own sake.
Hi Nightmare 1308
Do you still have the PDF for this?
Upvote0Downvote
Reply to G78 in the UK Electrical Forum area at ElectriciansForums.net
Similar threads
A
- Solved
How to identify presence of an earth electrode
There is an article about that here:https://www.cement.org/learn/concrete-technology/durability/corrosion-of-embedded-materialsIt states...
- An Buachaillín Bán
- UK Electrical Forum
- 27
- 2K
2
- earthelectrodehow toidentify
- Replies
- 27
- Views
- 2K
Jul 12, 2024
pc1966
P
O
dangers associated with wiring earth to neutral in the consumer unit?
I opened up the CU again and the round junction box above and what I found was the blue and brown wires coming in from the wall just above the 15a...
- overflow99
- UK Electrical Forum
- 33
- 2K
23
- consumer unitneutralno earth
- Replies
- 33
- Views
- 2K
Oct 4, 2024
overflow99
O
Recommended Sponsor News
Exclusive Forum Offer! Free euro 2024 wall chart for first 10 responses!
- Uheat - Jacob
- Forum Sponsor News and Offers
- Replies: 8
Hi everyone,
We have 10 exclusive Uheat EURO 2024 Wallcharts to giveaway for Electricians Forum Members! The first 10 people to reply YES to this thread - I will message and get them sent out to you just in time for this years tournament! GO GO GO
Quickwire Now Sponsor ElectriciansForums.net
- Lou
- Forum Sponsor News and Offers
- Replies: 56
I am sure you will join me in welcoming our newest sponsors of ElectriciansForums.net - Quickwire! They have decided to join us after seeing you guys discussing their products here. Now we have an expert on board that you can chat to @Quickwire-Sam who will be happy to answer your queries!
@Quickwire-Sam said "At Quickwire, we're all about speed, safety, and reliability. We're a family-run business, and every Quickwire connector is proudly made right here in the UK, ensuring noticeable quality. In short, Quickwire is the fastest connection method on the market. Whether you're an experienced electrician or a DIY enthusiast, Quickwire makes electrical connections ridiculously quick and easy. We're passionate about blending British craftsmanship with innovation. If you have any questions or if there's any way we can help, please just ask me!"
PCBWay Now Sponsor ElectriciansForums.net!!
- Lou
- Forum Sponsor News and Offers
- Replies: 4
I hope you will all join me in welcoming our newest sponsor to the forum PCBWay! You can contact their friendly people by sending a message to @PCBWay who will be happy to answer your queries.
Welcome to the community and thanks for your sponsorship!
PCBWay provides services including PCB Prototype and batch Production, PCB Assembly (SMT), 3D Printing, CNC Machining, PCB Design, Electronics Modules Selling, etc. We are committed to meeting the needs of global makers from different industries in terms of quality, delivery, cost-effectiveness, and any other demanding requests in electronics.