AC SPC. do I need a MCB ??

As per tittle,

From my inverter and before my AC consumer unit (UK) I wanted to add this SPD and mains switch (the switch is only for the SPD as the consumer unit spurs off the line in)

my consumer unit houses all my AC MCbs and I am earth neutral bounded at the consumer unit.

I have read the SPD should have an MCB, but I can't understand why???
Does it need one???

PS, if any Uk forum member is interested in this metal housed SPDs and 100a switch, they are grate for the price, heavy duty wires inside a nice metal enclosure, and a reputable brand, there is room for a MCB, but you will need to cut the front panel face, but there is room.

No dedicated disconnect is needed. As long as you have another way to turn off the power, for replacement.

Curious as to why you want to place a SPD in this location.
Is the inverter outside the home?

timselectric said:

No dedicated disconnect is needed. As long as you have another way to turn off the power, for replacement.

Curious as to why you want to place a SPD in this location.
Is the inverter outside the home?

Click to expand...

Inverter is not outside,

Have done a little more research, it might appear a better idea to come from one off the consumer units MCB to the SPD in its own separate encloser.

I have no preference as to how to fit it, to be honest, its more lack of knowledge that I was thinking of doing it my first suggestion way round.

SO, I am NOW thinking do it like this video

Better option.

Yes, you should have an MCB BEFORE the SPD.
That's because the SPD will by design short the line to ground, should a high enough voltage spike occur.

The SPD itself could melt, same for the wires.
An MCB will protect from this, should the SPD short or heat up.

timselectric said:

Curious as to why you want to place a SPD in this location.

Click to expand...

Me too. What is your exact reason to deploy a SPD?

SeaGal said:

Me too. What is your exact reason to deploy a SPD?

Click to expand...

was explained further up the thread