Hello everyone,
We have a detached double garage that is still in the shell construction phase.
The flat roof (solid concrete) extends about 30cm (12 inches) on two sides: once along the length of 8m (26 feet) and once along the width of 6m (20 feet) at the front. During the shell construction, I planned a groove here (approximately 2.5cm (1 inch) wide and 1.5cm (0.6 inches) deep) to lay a cable or an LED light strip, see sketch. Additionally, there are empty conduits with junction boxes at two corners as supply lines from the sub-distribution board.
What kind of exterior lighting would you recommend here? Would an LED light strip even make sense, or would it hardly be noticeable since the facade hardly receives any light? The entire facade and the roof overhang are not plastered yet, so I’m still considering the lighting options.
The entire electrical setup has not been planned yet because my electrician is still on vacation. However, I would like to get some preliminary ideas. The double garage is approximately 26m (85 feet) away from the main house (main distribution board). The garage should have its own sub-distribution board, possibly a wall box for electric vehicle charging, maybe two decentralized ventilation units (whether with heat recovery or not still needs to be decided), an electric garage door, about 4-5 power outlets, and lighting. Therefore, the cross-section of the supply cable will be important, and it might even be better to choose a somewhat larger cross-section. The electrician will need to advise or calculate this. But in general, which direction would the cable cross-section tend to go? 10mm², 16mm², or larger?
We have a detached double garage that is still in the shell construction phase.
The flat roof (solid concrete) extends about 30cm (12 inches) on two sides: once along the length of 8m (26 feet) and once along the width of 6m (20 feet) at the front. During the shell construction, I planned a groove here (approximately 2.5cm (1 inch) wide and 1.5cm (0.6 inches) deep) to lay a cable or an LED light strip, see sketch. Additionally, there are empty conduits with junction boxes at two corners as supply lines from the sub-distribution board.
What kind of exterior lighting would you recommend here? Would an LED light strip even make sense, or would it hardly be noticeable since the facade hardly receives any light? The entire facade and the roof overhang are not plastered yet, so I’m still considering the lighting options.
The entire electrical setup has not been planned yet because my electrician is still on vacation. However, I would like to get some preliminary ideas. The double garage is approximately 26m (85 feet) away from the main house (main distribution board). The garage should have its own sub-distribution board, possibly a wall box for electric vehicle charging, maybe two decentralized ventilation units (whether with heat recovery or not still needs to be decided), an electric garage door, about 4-5 power outlets, and lighting. Therefore, the cross-section of the supply cable will be important, and it might even be better to choose a somewhat larger cross-section. The electrician will need to advise or calculate this. But in general, which direction would the cable cross-section tend to go? 10mm², 16mm², or larger?
Fuchur schrieb:
If a joint is already planned there and the ceiling is made of reinforced concrete, then there really is no better alternative than your suggestion. If necessary, I could have the joint plastered over again. When the concrete was poured, I quickly planned it like that or installed a polystyrene strip. I will look for LED strips, one 8 m (26 ft) and one 6 m (20 ft).
Could you give some advice regarding the supply line for the sub-distribution panel? In which direction and what cross-section would it roughly be?
I’m also currently considering the ventilation of the double garage (possibly decentralized ventilation with heat recovery). But I’ll probably open a separate thread for that topic.
netzplan schrieb:
Could you provide some input regarding the feeder cable to the sub-distribution board? Which direction and cable cross-section would be appropriate?
I’m also currently considering the ventilation for the double garage (possibly decentralized ventilation with heat recovery). However, I’ll probably open a separate topic for that. Ask an electrician or calculate it yourself. How much voltage do you lose at the expected current over the distance? The cable cross-section depends on that. U = R * I.
netzplan schrieb:
I’m also currently considering the ventilation for the double garage (possibly decentralized ventilation with heat recovery). However, I’ll probably open a separate topic for that. Most garage door openers have a ventilation mode. Why would you need heat recovery in a garage? High-end cars or use as a recreational room?
Araknis schrieb:
Ask an electrician or calculate it yourself. How much voltage will you lose at the expected current over the distance? The cross-section is then determined accordingly. U = R * I.Yes, the electrician has to do that anyway. I was still interested in the calculation. I also found some online calculators where you enter three-phase current, 230V, cable length, 3% loss... and then a cross-section is calculated. But for this, I would need to know the "current [A]".Araknis schrieb:
Most garage door openers have a ventilation mode. Why heat recovery in a garage? Luxury cars or use as a party room?Maybe an occasional small gathering once or twice a year. But I think we’ll mostly use the garden for that, unless it’s raining. So heat recovery wouldn’t really be necessary. I thought it might be better for the car or garage contents (tools, e-bikes, electric car…).Because fans with heat recovery probably wouldn’t be very expensive.
netzplan schrieb:
Yes, the electrician needs to handle that anyway. I was still interested in the calculation though. I also saw a few online calculators where you enter three-phase current, 230 V, cable length, 3% loss... and then a cross-section is calculated. But for that, I would need to know the "current [A]". LEDs use direct current! Not three-phase current or 230 V. You get the current from the length of the LED strip in its datasheet. It will state how much current the device draws at its operating voltage (e.g., 12 or 24 V). Alternatively, if you place the power supply very close, then it doesn’t matter at all.
netzplan schrieb:
Maybe an optional small gathering once or twice a year. But I think we’d mostly use the garden for that, unless it’s raining. So heat recovery wouldn’t be necessary for that purpose. I thought it might be better for the car or the contents of the garage? (tools, e-bikes, electric car…) The garage, with its door, is not as airtight as the rest of the house anyway, so both ventilation and heat recovery are pretty much irrelevant. Getting rid of moisture in winter could be a reason for ventilation. But heat recovery is nonsense since you don’t really heat the garage like the rest of the house (i.e., underfloor heating, etc.), and as mentioned, the door isn’t airtight anyway.
Araknis schrieb:
LEDs run on direct current! Not three-phase or 230 V. You get the current over the length of the LED strip from its datasheet. It specifies how much current the device draws at its operating voltage (e.g., 12 or 24 V). Alternatively, if you place the power supply very close, then it doesn’t matter at all.I wasn’t referring to the LED strip itself, but rather to the supply line to the sub-distribution board (garage), starting from the main distribution board or meter cabinet (main house).
netzplan schrieb:
I wasn’t referring to the LED strip, but basically to the supply line to the sub-distribution board (garage), starting from the main distribution board or meter cabinet (main house).Then add up your current and future power requirements, e.g. wall charger, welding machine, electric heater, e-bike, garden pump, etc., and the electrician will size the supply line accordingly.Similar topics