ABSTRACT
This chapter details the basic design and layout of a typical electrical supply to a house and explains the devices which are used to protect against the possibility of electric faults and electric shock. It discusses the principles of fire alarm systems and home security systems. The key units of measurement of electricity are volts and amps. In modern construction, electrical supplies to houses should be designed and installed in accordance with the Building Regulations. The consumer unit contains the householder’s mains switch, which can isolate all of the circuits in the house. Until the 1940s, the power circuits to a house were generally arranged in what was described as a radial system. In bathrooms and shower rooms, special protection measures are required as set out in the BS 7671 Wiring Regulations. The lighting circuit of houses used to be arranged in what is known as a junction box system.
