2 TECHNICAL SYSTEMS ELECTRICAL SYSTEMS Match the country to its right voltage. Surf the net to get information. 1. The UK 2. Australia 3. Canada 4. The USA 5. Italy a. 240 b. 110 c. 220 d. 120 e. 230 LED stands for Light Emitting Diode. Do you have any electrical appliances at home which can be connected to the Internet? Write a list and compare it with that of your classmates. appliances: elettrodomestici to cut off: interrompere to divert: deviare fallout: fuoriuscita high-moisture: alto livello di umidità incoming: entrante low-power: a basso consumo to mount: montare, sistemare safety: sicurezza utility company: azienda di fornitura (elettrica, gas, acqua) wiring: insieme di fili e cavi Parts of the electrical system A home electrical system includes the incoming power lines, an electric meter or a modern digital meter (also called smart meter), service panels, wiring, electrical boxes, switches and sockets, and, of course, appliances and lights. Each room in the house needs a certain number of light points. According to recent legislation, it is necessary to replace the old incandescent bulbs with low-power or LED ones. Other electrical systems in a house may include wiring for home entertainment, such as cable television, home theatre and audio systems and wiring for home communications, such as telephones and the internet, security systems, and in the most recent houses, also wiring for home automation systems. How the electrical system works Electricity arrives at your house from your local utility company by a power line or underground through a conduit. Generally, an electric meter, monitored by your electric utility company, is mounted where the electricity enters your house. Electricity runs through the conductor wires giving power to lights and appliances. An additional grounding wire can be attached to sockets and other electrical devices and also securely connected to the ground. The purpose of the grounding wire is to divert electricity from a short-circuit into the earth, preventing electric shock. Safety measures They are required to protect the inhabitants of the building. They include circuit breakers 144 BUILDING CONSTRUCTION Close-up of electrical fusebox to prevent fires by cutting off electricity, ground-fault circuit interrupters (GFCI) in high-moisture areas, such as kitchens and bathrooms, smoke alarms and gas detectors to alert occupants of a fire or gas fallout, and security systems to protect the house from potential intrusions. Electrical systems are regulated by international and local building codes. The installation must be checked when the home is finished to ensure all codes have been followed and the electrical system is safe for the people that will live in it.