Isolator in the outdoor electrical box

[Rokmais]

Hi there,

I'm planning to replace the MCB on my outdoor electrical box with a better quality one, and since there is already an isolator installed by ESB Networks, as a DIY I can safely do it myself. My question is, about the isolator marked inside the orange circle. Does anyone knows what key should I use to rotate it to the OFF position and is there any safe procedure for that I should be aware before touching it?

Any advice on this would be greatly appreciated!
Thank you in advance

 

[westward10]

It isn't a key the switch knob assembly is missing.

 

[Risteard]

These are Restricted Electrical Works. You must not interfere with the Main Overcurrent Device. By doing so you will be committing a criminal offence which is punishable by a fine of up to €50,000 and/or three years' imprisonment.

Only a Registered Electrical Contractor (REC) can carry out these works.

 

[westward10]

I had a feeling this was Ireland.

 

[brianmoooore]

Is that some kind of current limiting device then? More than an isolator with a missing knob?

 

[Risteard]

Is that some kind of current limiting device then? More than an isolator with a missing knob?

No. It's just the DSO isolator. Operated with an allen key.

 

[brianmoooore]

You must not interfere with the Main Overcurrent Device.

The main overcurrent device is the fuse in the service head, isn't it? Don't think there's any intention of interfering with that.
Isn't the 63A MCB in the IP65 enclosure the consumer's property?
Or is it normal in Eire to have a second overcurrent device on the whole supply?

 

[Risteard]

The main overcurrent device is the fuse in the service head, isn't it? Don't think there's any intention of interfering with that.
Isn't the 63A MCB in the IP65 enclosure the consumer's property?
Or is it normal in Eire to have a second overcurrent device on the whole supply?

The Main Overcurrent Device is part of the consumer's installation and is not the DSO fuse. Traditionally it was typically a switch fuse but now in almost all circumstances needs to be in the Permalli Box. It is the MCB.

Incidentally in this image the customer's meter tails & main protective conductor are coming from the top right-hand side of the Permali Box. They should only ever enter through the bottom right and should be protected in the wall and entering the enclosure (e.g. with kopex).