Wrong tool for the job. RCD (the test button is giveaway) protect against current imbalance. T2 SPD works in 8/20microseconds.

T2 SPD is always standby 24/7 with nothing to do for the user, no buttons to press, no switches to flip. Only inspect once in awhile there is still enough "life" in the window.

Example of three phase Type 2 SPD:


Whole house Type2 SPD (indirect strike) is usually what you will need.
Proper ones like Hager SPM240E/440E or ABB OVR-T2 or Schneider iPRD is supposed to be installed in the DB box, AFTER whole house MCB and BEFORE whole house RCD.

30 dollar china made unknown brand "toys" may not work well.
Generally, a good T2 SPD for single phase about 200-230 bucks, 3 phase 400-500 bucks

50cm rule of total max cable length apply for installation of T2 SPD.


per https://www2.theiet.org/forums/forum/messag...&threadid=50221

Further reading on SPD..start with https://www.electrical-installation.org/enw...on_Device_(SPD)

Lots of things to read on SPD. By the time finish reading all, MCO 3 over jor

This post has been edited by ceo684: May 10 2021, 11:22 PM

Any electrician should be able to handle it.
Roughly its like this:


Attached thumbnail(s)

Yes 3 phase. 1 phase delete L2 and L3.

Single phase buy a 2P 40kA spec "two module width size"
The 4P "four module width size is for three phase"
Do not buy elcheapo one from china.

At minimum, also go for local brand maxguard
https://shopee.com.my/product/15390731/1108027522

Mau cantik ABB OVR T2, Hager SPM240E, Schneider
https://shopee.com.my/product/386581856/13033166073 or official mall https://shopee.com.my/product/403384113/10169243255

https://shopee.com.my/product/226439918/7961546468
https://shopee.com.my/product/311767359/8524543680

All will work fine
Then order RED BLACK GREEN mega kabel loose cut. 1 meter for each colour.
https://shopee.com.my/product/482509406/13428192556 4mm

https://shopee.com.my/product/129202704/5132067326 6mm

4mm or 6mm see SPD model say what size. But 4mm already can use lah..lightning surge is very high voltage and very low current.

It adds on in the main DB box. Refer 3:11 for the general diagram https://youtu.be/oa_a4HTVqoQ?t=191

Depending on what supply (1 phase or 3 phase), you need some room in the DB box (of either 2 modules width, or 4 modules width).
To create room, this may require moving around some MCB's; or if the DB box is full, a new bigger box preferably with similar layout need to be installed.

Similar layout meaning if currently u are using a 12x2 row (24 slot)
----------
----------

expand to something like a 16x2 row (or 16x3 row).
-------------
-------------

If you expand to a 27x 1 row format
------------------------------

yes, it give u 3 more slots space as 27>24
but the problem is I dont think your existing wiring lengths can stretchhhhh that much (mostly it is just nice only, no slack).
Hence if its 12x2 row in the beginning then u need to get something that follows along the same format as the old box.

The SPD still need a bit of kung fu to do properly although its install location is confined to within the DB box.
Technically the connection is the easy part but that's assuming the customer DB box has sufficient space else need to upgrade bigger box and/or remove unused MCB to fit and move out existing MCB as the "wong wai" is closest possible to the main MCB [50cm max = shortest bestest].

https://library.e.abb.com/public/76853add5a...olutions_EN.pdf
pages 19, 21, 22, 23, 30 (see TNS/TT system diagram, Malaysia use TT).


Back-up protection dedicated to the SPD = At bare minimum, SPD must be behind at least the main MCB (for indirect strike/T2).

It is recommended to have another MCB dedicated just for the SPD alone (whilst the main MCB will take care of shorts, but additional one MCB still not expensive to implement) in case the SPD totally failed due to damage (and created a short circuit) after kena too many strikes.

This post has been edited by ceo684: Dec 21 2021, 12:31 AM

ABB, Hager, Eaton got publish a lot of SPD literature.
Basically ensure the SPD is downstream of an MCB in case it short open.
SPD put upstream of RCD because you want to shunt off the excess power. The RCD may be damaged if RCD upstream of SPD.

This post has been edited by ceo684: Jan 18 2022, 01:59 PM

Based on ST literature

Therefore, the following is recommended:
1. In general, to install SPDs upstream of RCDs (RCDs installed
upstream of SPDs may operate on the expected surge currents);
2. If SPDs are installed downstream of RCDs, the expected surge
currents to earth should not exceed the immunity value of the RCD.

Based on Hager literature

Should RCD’s be required in the installation as additional
protection or to ensure the requirements of fault protection
are satisfied, then the SPD will need to be installed upstream
of the RCD. Where this cannot be avoided, the RCD should
be of the time-delayed or S-type.

I think it is best to follow the experts rather than experimenting because usual RCD type AC is instant trip, we don't use S type or time delayed in residential

Well FWIW, think I better place my trust in SPD mfgs who have a test lab to simulate lightning arcs..than someone selling on shopee.
Its kind of a rule for proper SPD installation, else they wouldn't bother to state the total length <50cm all over.
refer https://www.beama.org.uk/asset/1FE338CE-496...37F3DEA6C683C6/ page 53 onwards

How about replacing the DB box with a bigger one? Let's see what's the current configuration (share pic) first.