In all new houses and apartments you will not see on electric guard of traditional traffic jams any more, instead of them there are circuit breakers. They not only it is more convenient than traffic jams, but also it is much more reliable. When choosing circuit breakers there is always question – on what current it has to be calculated?
Instruction
1. Correctly picked up circuit breaker has to work in case of short circuit of wiring or at loading, rated significantly exceeding. At the same time, it should not be switched off if you, for example, have turned on at the same time electric kettle and the washing machine. For this reason select the time cut-out specifically under your wiring and loading.
2. Buy circuit breakers only in specialized shops, it will allow with large-scale of probability to buy quality goods. Remember that the rated current of the time cut-out should not be higher than the current capacity, maximum allowed for your network. In other words, the automatic machine has to work, but not burn down wiring.
3. Calculation of parameters of the circuit breaker is made as follows. Let's assume that you have turned on the 2 kW electric kettle. Let's separate power, in watts, into 220 volts, we will receive current 9.1 A. This digit can be rounded to 10 that in calculations there was some stock. Means, the time cut-out has to sustain current in 10 amperes. Now count the total power of all of the electric devices which are at the same time switched on by you and calculate, on the scheme given above, current intensity. Let's say at you 30 amperes will turn out – mean, the circuit breaker has to be calculated on this current.
4. Having carried out the previous calculations, you have counted on what current the time cut-out has to be calculated. But you need also to know what current will be sustained by your network, and it depends on the used wires. For example, if wiring is executed by aluminum wire with a section of 2.5 mm (most widespread option), it is capable to sustain current with a force of 24 amperes and loading in 5.2 kW. Means, in your case the circuit breaker has to be calculated on current slightly less than 24 amperes. If you use copper wire of this section, then it will sustain current in 30 amperes and loading in 6.6 kW. When using wire of other section find for it data on the maintained current and loading in the Internet.
5. Mounting wiring in the house, in advance provide its division into several isolated chains. For example, make separate chains of lighting and wiring to sockets. It will allow you to establish on each chain on the separate circuit breaker that it considerably will increase the general safety. Such electric devices as washing machines or electric water heaters, in addition include through OUZO – the device of protective shutdown capable to protect the person from defeat by electric current. OUZO reacts to leak therefore in case of touch to phase wire will immediately disconnect current.