1. Select the master switch according to the electrical load for installation. Suppose: The total current within 15 kilowatts is generally 70A. The total current of 10 kilowatts is about 46A. The total current of 5 kilowatts is about 23A.

The selected total power switch is a 2-pole 2p type with rated currents of 80A, 60A, and 32A. If a leakage switch is used as the main power switch, a leakage switch that prevents lightning impulse voltage and does not operate must be selected. Other types of leakage switches are not suitable for use as the main power switch.

The capacity and rated current of the leakage switch is 100A, (there is no choice but one specification). 63A, 32A.

Select the number of digits for the rated operating current of the leakage switch. Use 30 mA. If 10 mA is selected and the branch is selected to repeat, once a leakage current failure occurs, the main switch will break the main power branch continuously. If the last specification 50 mA is too large, it will not work.

The rated operating time of the leakage switch is 0.4s.

2. Selection of switch for 15 kW branch: set as three branches for air conditioning and two branches for lighting. Kitchen and bathroom branch. Sanitary branch.

Air conditioning is divided into three branches. Choose 2 pole 2p type switch. The rated current of the switch of each branch is 20A. The switch of the second branch of the lighting selects 1p type single pole switch. The rated current is 5A. These two parts generally do not need to install leakage protection. The switch of the kitchen and bathroom branch must be equipped with leakage protection. Because the environment is prone to humidity. The rated current of the leakage switch is 16A. The rated operating current is 10 mA. Leakage protection must be selected for the sanitary branch. The selected rated current is 16A. The rated operating current is 10 mA. The rated action time of the leakage protection switches of the kitchen, bathroom and bathroom branches is 0.2s.

3. The choice of 10 kilowatt branch circuit: set as two circuits for air conditioning, two circuits for lighting, six circuits for kitchen and bathroom, bathroom.

The air conditioner is divided into two branches to select 2-pole 2p type switches, each with a rated current of 20A. The rated current of the single pole 1p type used for the two branches of lighting is 5A. These four branches generally do not need to be equipped with leakage protection switches. The kitchen, bathroom, and bathroom branches are equipped with leakage protection switches and the rated current should be 16A. The rated operating current is 10 mA. The rated operating time is 0.2s.

4. The choice of a 5-kilowatt branch. It is divided into four circuits: air conditioning, lighting, kitchen and bathroom, and bathroom.

The air conditioner uses a 2-pole 2p type, and the lighting also uses a single-pole 1p general air switch. The rated currents are 16A and 5A respectively. The kitchen, bathroom, and bathroom all use leakage protection switches. The rated current is 10A, and the rated operating current is 10 mA. The rated operating time is 0.2s.

Advice: Anyone who uses electric heating appliances must install a leakage protection switch. The rated operating current is 10 mA or 6 mA. This is the national standard. The red line cannot be offended.