Yes, I know about those three lines protection.

In MR DIY powerstrip, if there is power surge and all four switches are turned on, only Green socket will be protected from surge while the Blue, Orange and Red sockets will be hit by surge.

In this case, the MOV should be installed as shown below in red line (Point of entry):

This way, all four sockets will be protected from surge coming from Live wire by redirecting surge to Neutral wire out.
I have no idea why the MOV is installed that way protecting only one socket   and still pass SIRIM.

Yes, I know about those three lines protection.

In MR DIY powerstrip, if there is power surge and all four switches are turned on, only Green socket will be protected from surge while the Blue, Orange and Red sockets will be hit by surge.

In this case, the MOV should be installed as shown below in red line (Point of entry):

This way, all four sockets will be protected from surge coming from Live wire by redirecting surge to Neutral wire out.
I have no idea why the MOV is installed that way protecting only one socket   and still pass SIRIM.

Well the truth about surge protection is electrical surges are kinda unpredictable in terms of amplitude (peak to peak volt) or duration (surge time) so designing a perfect surge arrestor is close to impossible. Even industrial surge protector guys such as Emerson etc usually do not offer any sort of guarantee.

In fact some manufacturers put multiple MOVs across the same system in hopes that one of them 'catches' the strike. Theoretically installing a MOV at the 'entrance' is a good industry practice but there is no concrete proof that installing elsewhere along the PCC (Point of common coupling) affects the efficiency of the surge arrestor system.

If you have an expensive equipment, investing in a proper surge arrestor instead of Mr DIY is highly recommended 

pls dont tell me u r an electrical engineer

betul la use 471

u wrote 275... the 275 is part number or volt?

wanna beter protection, better buy Cal Lab

Mr DIY surge arrestor also can spark discussion LOL

u wrote 275... the 275 is part number or volt?

where did i write?

in anycase if got one behind the part number, usually is multiplier la.

  I just read what those manufacturers product training brochure mentioned about MOV placement......it recommends the MOV to be installed at 'entrance' of power input.

Wouldn't installing MOV at 'entrance' mean that location is path of least resistance once the varistor start to conduct after encountering a surge?


I am not.
But seriously, I am not planning to use it for 1000v or lightning strike protection, just day to day small surge from high powered motors/heaters (Neighbours car cleaning/washing business)

OK

i saw the data sheet. it can be used.

the question here is can 275V damage ur load? if can, then hv to go 275V

sorry

u did wrote 275 lol

If the impedance between the 2 points are negligible, then these 2 points are at the same electrical potential. I guess manufacturers don't know this value that's why they recommend putting at the 'entrance'? And Mr DIY probably installed it at whichever cheapest location

u got eye sight problem?

come i screen cap for you who wrote 275

ok sorry

*okay.jpg*

Hmm, make sense.

So, sifu   ....Is it fine if I move current MOV location to entrance just to be safe? Or I just leave it as it is?
Since I don't even know the impedance between those two points and MR DIY probably installed it randomly.

I not sifu la lol. If you paranoid then make a trip to Jln Pasar, buy another MOV with same part number and stick it to the entrance also can.

What makes u consider surge arrestors at the first place? If your lights dim while your neighbours wash their car it's better to check grounding instead