Surge Protection Device (SPD)
- Thread starter hard-work
- Start date
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I think it says.
1) if you live in (e.g 1 bed flat) with little electronic equipment
or
2) You can see the substation from your window,
you don't require one
Commercial, industrial and most everything else that's not domestic - required
Domestic - risk assessment will indicate required or not, but that does NOT cover situations where overvoltage can be caused by things within the installation, so may be still be required even if the assessment says not.
If risk assessment is not done, required unless value of installation does not justify protection.
Installations with nothing of value worth protecting are exceptionally rare, as are those that don't have inductive or capacitive loads.
Domestic - risk assessment will indicate required or not, but that does NOT cover situations where overvoltage can be caused by things within the installation, so may be still be required even if the assessment says not.
If risk assessment is not done, required unless value of installation does not justify protection.
Installations with nothing of value worth protecting are exceptionally rare, as are those that don't have inductive or capacitive loads.
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thx Flameport. So a new CU under the 18th needs RCD and SPD protection on all circuits - with some remote exceptions. So, we will see SPDs and RCD as standard in all new CU installations.
Here is a CU available from S/fix complete and wired with RCDs ready to just screw to the wall saving time. No SPD fitted.
https://www.screwfix.com/p/mk-sentr...ed-split-load-main-switch-consumer-unit/2186g
Here is a CU available from S/fix complete and wired with RCDs ready to just screw to the wall saving time. No SPD fitted.
https://www.screwfix.com/p/mk-sentr...ed-split-load-main-switch-consumer-unit/2186g
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They don’t even make that product anymore. Clearing stock.
If you look at Hager or fusebox you can specify spd
If you look at Hager or fusebox you can specify spd
There is also this useful little item: https://www.tlc-direct.co.uk/Products/WYREC2SPD.html
My point is that the scenarios in which a SPD is omitted will be so few that most CUs fitted will have one. An e.g., even though RCDs were not mandatory they were being fitted becoming the norm.
Look at the S/fix web site. They sell many pre-wired CUs already populated. None have SPDs in them.
About as much as people replace every 10 years, smoke alarms or airbags
Why is "transient suppression" necessary ?
Because too many appliances / lamps / etc are so poorly designed that they self destruct when they get a piddly little transient up their input circuit.
And/or
The supply network is now compromised by :-
(1) solar PV networks coming on and off line ( tend to be surges rather than transients ) but a 11kv -> 230v network transformer can "spike" it's output when the load on it changes due to a significant PV event
(2) other customers with large inductive loads.
(3) other customers with large capacitive loads.
Because too many appliances / lamps / etc are so poorly designed that they self destruct when they get a piddly little transient up their input circuit.
And/or
The supply network is now compromised by :-
(1) solar PV networks coming on and off line ( tend to be surges rather than transients ) but a 11kv -> 230v network transformer can "spike" it's output when the load on it changes due to a significant PV event
(2) other customers with large inductive loads.
(3) other customers with large capacitive loads.
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