On 26/08/2019 12:19, Robin wrote:
On 26/08/2019 12:07, dennis@home wrote:
On 26/08/2019 11:56, Robin wrote:
On 26/08/2019 11:31, dennis@home wrote:
On 25/08/2019 23:08, Robin wrote:
On 25/08/2019 21:50, wrote:
On Sunday, 25 August 2019 19:59:32 UTC+1, ARWÂ* wrote:
A load of ******** here for you to read and forget
https://professional-electrician.com...d-as-standard/

"a relatively low-priced and widely available safety item"

low priced??

And isn't there a bit of a fire risk having something that goes
pftttt in a consumer unit? In the top photo it's wired across the
main switch and not even fused down



like many (most?) such it comes built in fuses so needs no
additional overcurrent protection.



You would think it should handle thousands of amps or its not going
to do anything useful.


They can handle 10s of kA - but only for /very/ short periods.

The overcurrent protection is to protect the cables and SPD against
faults.



The company fuse should protect those.
Typically its 100A, mine is only 80A though.
Obviously if the SPD you buy specifies less then you need something
extra to protect it.


1.Â*Â*Â* You may be happy to risk a faulty SPD taking out the "company
fuse". Others wouldn't.

2.Â*Â*Â* Some SPDs specify maximum overcurrent protection of less than 80A
- including the one in photo (63A).


Then they are the wrong ones to use in that CU, unless you don't mind
your supply being reduced to 63A and you fit another fuse/breaker.