Bonding to a lighting conductor lightening conductor

[albi]

Hi Boys andgirls

Does any one have any idea on the size the bonding conductor should be to alighting conductor. Its for a small church, it is a TNS system single phase

Ze 0.40Ώ and PFC0.575KA. The distance from the MET to the lighting conductor would be 60M away.



The reg's aresaying use the adiabatic equation but what would you use for I2 forthe lighting strike :Salute

 

[NozSpark]

IMHO this is specialist work,,, just get someone in

 

[Sidewinder]

Try BS EN 62035, it is a bit different to 7671, and, you may find yourself uninsured.

 

[albi]

I understand all of this but BS7671 states it needs to be earth. And as I have just changed the DB's in the church I would assume it's down to me

 

[NozSpark]

Then you perhaps should get a specialist in??

 

[Sidewinder]

Else understand all the ramifications of the 4 parts of BS EN 62035, the requirements of BS7671 and other relevant statute law, and industry guidance so that you can undertake the works as you see fit.

After all, you are the designer, installer, tester and certifier of the BS7671 works, if you wish to take on the works under other requirements, then you need to be sure yourself and ensure that you are insured really to cover yourself.

Sorry that this is not what you want to hear, however, lightning protection is a little more complex than running in a ring final circuit under 7671.

Please don't be offended, but, we can't all be experts in everything.

I don't "do" lightning protection, I use experts.

 

[albi]

I understand what you are all saying and thank you for your comments

 

[jopo]

Hi Boys andgirlsDoes any one have any idea on the size the bonding conductor should be to alighting conductor. Its for a small church, it is a TNS system single phase

Ze 0.40Ώ and PFC0.575KA. The distance from the MET to the lighting conductor would be 60M away.



The reg's aresaying use the adiabatic equation but what would you use for I2 forthe lighting strike :Salute

sorry to ask a question to your request.

just the request confuses me as in AUS we are not required to ensure that a earth conductor in a lighting circuit must be able to accomadate any lightning induced current. This is how i have interpreted your post. did i get it wrong.

 

[Steve3948]

I think the Op means Lightning not Lighting :Salute

 

[kerching]

I would get Furse or similar involved in the installation....end of!

I am allergic to falling from heights...even though your connection will most likely be at ground level. If something goes wrong ie not enough money on the collection plate and Him up there gets a bit moody and casts a bolt of lightning AND something melts/goes wrong etc who are they going to blame??? Pass the can, you know it makes sense!............ :coat

 

[NozSpark]

It ain't the falling that hurts, it's the landing:O

; )

 

[wozz]

When I worked for a company that did this, run in a cable same size as other bonding conductors and leave it for them to connect. Job done.

 

[premierspark]

Albi, its all ******** mate, just leave a fire extinguisher at the mains mate :slap

 

[SPARKY51974]

Why would he want to leave a fire extinguisher at mains is it that bad?

 

[SLIPSHOD & SLAPDASH]

I have never understood why lightning conductor bonding was added to the regs. Can someone enlighten me ?

 

[steptoe]

I have never understood why lightning conductor bonding was added to the regs. Can someone enlighten me ?

yep, Im sure the rev could explain it better than me, but lets just say the next time the fuse blows, just dont use certain swear words as you change it!

 

[wozz]

I have never understood why lightning conductor bonding was added to the regs. Can someone enlighten me ?

No expert and could be wrong but from what i understand from a document that I read some time ago, most of the damage caused by lightening (fires) was from the it jumping as such through the fabric of the building onto metal work, all metalwork and conductor at the same potential less chance of jumping. A wrecked fuseboard and equipment is nothing compared to a building being a pile of ashes.

Im sure someone who knows what they are talking about would cringe at my post but I hope I have the basic principles there.