ᐅ Garage Electrical System: Circuit Breaker Panel, Electrical Circuits, Outlets

Hello everyone,

Our house is slowly but surely taking shape, and of course, the double garage must not be missing. Since we built the garage ourselves, the electrical work is also our responsibility. I’m not going to mess around with it, but I’d like to know in advance what makes sense.

Chasing the walls for cables and laying them is manageable.

For the garage, I am currently considering two approaches:
Two separate electrical circuits in the garage:
One circuit to power the six outlets distributed throughout the garage
A second circuit for two lighting circuits; one controlled by a motion sensor that automatically turns the garage lights on and off depending on the brightness (access to the house through the garage is possible), and a light switch that controls a constant light with multiple fluorescent tubes for when working on projects in the garage.

Does this have to be done with two separate circuits, or is a single circuit distributed via a junction box sufficient here?
Should a separate fuse box (distribution board) be installed in the garage, or is it sufficient to protect everything from the main fuse box in the house?

Thanks and best regards
Georg

Do you have a known electrician or do you need to hire a company?
I would suggest three circuits in total: outlets, lighting, and definitely a 32A power circuit.

You can also set up the breaker panel as you wish, either inside the house or a subpanel in the garage.

What does your electrician, who is working on the house, say? I would like to point out NAV §13.

I would install a supply line for the garage with the appropriate cross-section (three-phase) and set up a sub-distribution board in the garage.

Whether to choose 3~16A or 3~32A is debatable. However, the cost for 32A should be only slightly higher. Considering electric vehicles, it’s worth investing in the slightly higher capacity.

I am an electrician myself and have 2x16A and 1x32A circuits in my garage. I have the outlets protected by three separate circuits, and the lighting is on a separate circuit as well. The lighting and outlets are also connected to separate RCDs (residual current devices).

However, if you never plan to connect electric motors for log splitters or other three-phase equipment, it will be difficult to justify installing more than a 3G1.5mm² cable if you only need a small amount of power and lighting.

Our electrician ran an underground cable from the fuse box in the utility room to the garage. The cable was fed through the wall at the very bottom of the inner corner. Then, in the garage, two weatherproof outlets with two corresponding light switches and two fluorescent tubes were installed using this cable. Karsten

I have installed only 2 circuits: one for high-voltage power and one for standard power. All phases are separately connected in the fuse box with a residual-current device (RCD).