Laboratories for the measurement of radioactive materials.Residues from deep geothermal energy.Residues from drinking-water treatment.Enhanced environmental radioactivity as a result of human influence.Natural radionuclides in building materials.Radiation exposure of mushrooms and game.Natural radionuclides in mineral waters. Radiation exposure due to natural radionuclides in drinking water.Radiation exposure via food intake.What radionuclides can be found in food?.Provisions for buildings and workplaces.What is the spatial distribution of radon in Germany?.Air monitoring at Schauinsland measuring station.Where does radioactivity occur in the environment?.Radioactivity in the environment.When in doubt, you can ask at a hardware store, or get help from an electrician. Devices are built for a voltage and you'll just need to supply what they need. Generally, you'll always use a single unless it's a high load device such as an electric oven or air conditioner. You would choose based on the need of the line. If you are modifying or updating in your residence, you'll either use 120V (single pole), or 240V (double pole). In a residence, the voltage would only be 240V. This is either on the pole, or on a padmount transformer. The lower 240V lines will start at the transformer. If I need to upgrade the whole electric circuitry of a house, do I need to worry about the high voltage and if so, where does the high voltage starts to drop down to the indoor value coming into the house? The 120 (110) that you refer to is between one line and neutral. The voltage to a residence is 240V, but between two lines. Where does the potential/voltage of the line drop to the indoor value, e.g., 110 V in the US?Īs shown by Michael, there are transformers that convert the higher voltage to lower voltage to your house. Transmission would be higher and can be run around city streets, but would generally go to a substation. What is the potential/voltage of the power line on a city street? Once you have a new main panel with a shutoff of some sort (either a main breaker or a separate shutoff switch) then any additional work can be done with the meter connected and power "live" to the house. That will make your main electrical panel "dead" so that it can be replaced safely. If you have to upgrade the entire electrical system of a house, the safest thing to do is often to have the utility pull the meter (or lock it out in some fashion). In some large buildings, that transformer may even be inside the building, but you, as the ordinary consumer, only get 240V/120V. Your utility provides 240V, and how it gets there is up to them. Typically there will be a transformer either on a pole or in an underground vault or on a street corner which transforms power from some higher voltage to 240V. The hots are 240V apart (there are some situations where they may 208V or some other value, but 240V is most common) and the hots are each 120V from neutral. In most places in the US, residential power comes into the meter at 240V/120V - three conductors, 2 hot and 1 neutral. When you would need service at a particular current level the power company will deploy the proper transformers and then provide a power line connection from the transformer to the electrical usage meter which would be on or adjacent to the home or business. Typically these transformers are owned and maintained by the power delivery utility company. Pictures of some typical power transformers are shown below. When high voltage power distribution reaches a residential neighborhood or a business center transformers are used to step the high voltage down to the voltages used in the homes and businesses. The voltage levels used will depend in part upon the type, location and distance that section of the power grid needs to deliver electrical power to the consumer loads. For each doubling of the voltage used in the distribution network the amount of current for the same load is cut in half. The power loss is always related to the amount of current being distributed to the loads. This is done to help minimize the amount of power loss in the distribution wires and cables. The power delivery utility company distributes the AC power to locations away from the power generating stations using high voltages.
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