Selection of voltage relays and RCDs in the apartment
New building. Copper is poured into the floor and ceiling except for 1 junction box. There is a counter at the entrance and AB 50A. In the apartment switchboard I want to install LV and RCD, but which ones?
The apartment has 4 groups:
- lighting;
- sockets;
- bathroom outlets (gr. 1-3 on VVGng 3 × 2.5 mm through AB × 16A);
- kitchen equipment (VVGng 3 × 4mm through AB × 25A).
From group 2, through a separate ABx16A (in case of a bay and short-circuit), I want to bring VVGng 3 × 2.5 mm to the loggia (lighting, 2 outlets + maybe then a warm floor). Group 3 has consumers: titanium with its RCD 2.5 kW, washing machine 0.86 kW, range hood and small things. Group 4 consumers: induction cooking 7.4 kW (actual load 30A), oven 2.6 kW, dishwasher 1.76 kW (recommended AB × 12A). I think this group has 4: remove the common AB × 25A from the RC, installing 3 separate ABs in the kitchen through the junction box for each consumer in the group: 32A (cooking), 16A (oven), 16A (dishwasher). The rest of the KBT and MBT will be connected to group 2 (sockets): microwave 0.7 kW, cold and hood 0.25 kW each, a 1.2 kW kettle and other rarely connected MBTs (meat grinder, food processor, coffee maker).
I summarize questions + maybe you will advise some other changes in the wiring:
A) What is the pH (barrier)?
B) What is the RCD?
C) Do I need a sequential AB for a loggia in group 3 and which one?
D) Should I remove the general AB × 25A from group RC for group 3 by installing 3 separate ABs in the kitchen (32, 16, 16)?
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A) Any voltage relay capable of withstanding a current of at least the current of the input AB, i.e. 50A, there are 50 and 63A models on sale - buy the one you think is necessary.
B) RCDs group fire at 100-300 mA, at the input and individual RCDs with differential. current not exceeding 30 mA to outlet groups or at least to consumers who are in the bathroom and in the kitchen.
C) There will be no excess, but there is no need for this.
D) Both options have a place to be. But what kind of choice was there 1 on 25A, put three and the largest of them is already 32A, what do you follow? The second option is good because the more machines - the more likely it is that in the event of a failure of one line - you can be powered for repairs from nearby ones.