Need some advice here..on SPD .

I am lookin to install a SPD surge device at the DB box /single phase /63A for my landed house.

What kA rating shall i chose ?

i see in shopee there is 20kA to 120kA choice.
is chosing a 100kA SPD better than 40kA

Thanks..

thanks ..
the price for 60kA and 100kA is about 98rm to 108 rm .
Any issues if i go for higher current capacity .

https://www.lazada.com.my/products/schneide...3660056082.html?

yaa Ok ... me too forgot theory , reading up but still blur ..

these days lots of lightning in KV ,,,hence time to check this out ...

Any power experts can shed some light . Thanks..

from google
KUALA LUMPUR: Subang which lies in the centre of a lightning dense triangle in the Meteorological Department's map for lightning density has one of the highest number of lightning incidences in the world.According to the department, Subang experiences lightning a minimum of 240 days a year.
This translates to between 25 and 40 lightning ground flashes per sq km in the area a year.
Subang resident Teoh Teik Hoong, who runs the community paper SJ Echo, said having his house tripped by lightning and seeing streaks of lightning across the sky was common.



This post has been edited by Momo33: Jul 27 2020, 03:18 PM

Look at MAX s posting about his power strip burnt . possible his TV would have blown if he didnt have a surge protector .

Lightning /Power surges are always happening on your power lines hence you need
add a layer of surge protection to safe guard your TV , routers etc...

1 phase SPD for whole house protection cost about 200rm . is cheap lah ... vs a burnt TV .

Direct hit on house is rare . Lighting rods are for direct hit.
SPD T2 are for suppression of power surge on the Line . which is more common happening.
Power strips like Belkins are SPD type 3 , easy to use , most are less than 5kA protection.

some statement not true.
After reading up on SPD it seems like it’s recommended especially if your house is on a high point

my answer . where ever the Lightning hits high point any anypoint ... the power surge gets into the tnb power lines and get into houses within that area . the surge is typical in about 20kA .
1 direct Lightning hits 1 house but the power surge can hit 500 houses in that area.

the mention electrician need to go back to School .


This post has been edited by Momo33: Jan 3 2022, 10:34 AM

yes 40 kA is fine. mean it can handle peak 40kA current in a surge condition / microseconds.
the clamp voltage is important . lower the better .

look for the ones with a status window. if it goes dead the window will turn red. so need to change or replace the module. my guess is about 10 years life unless you get a really big surge.

oh good idea.
I want to try

can you comment/ check this data if suitable for as like your application . TQ

https://shopee.com.my/Varistor-Metal-Oxide-...087.10322710509


This post has been edited by Momo33: Jan 4 2022, 03:20 AM

I am from Subang J. KV.

i select that 1 cos the advert has spec details that i feel are good. The other with no specs normally i skip.

Type: Metal Oxide Varistor (MOV)
Manufacturer: Nippon Chemi-con
Part Number: TNR12V471K
Element Diameter : 12MM
Max. Allowable Voltage: AC 300Vrms / DC 385V
Max. Peak Current: 4,200A @20µs
Max. Energy: 60J @2ms
Rated Wattage: 0.4W
Max Clamping Voltage: 775V @ 25A
Capacitance Typical : 345pF @1kHz
Varistor Voltage V1mA: 470V (423 ~ 517)V , ±10%

now after search again i saw this , and have chat the seller who is manufacturer as the datasheet link show many .
https://shopee.com.my/1pcs-Varistor-05D471K...1804.6578019841

the recommended is between the tnb main fuse and the RCCB .
but do follow the manufacturer install guide that comes when you buy 1.

the SPD clamps the surge and bring the surge currents to ground .
this is to avoid RCCB tripping or at least minimize the trips. . if you place it before the RCCD.

if placed downstream the SPD will still function plus for sure the RCCB will also trip.

the SPD response is faster in microsec due to fully electronics compare to RCCB has relay/ slower response.