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Local fields

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An energy-efficient, modern device uses less power and often (not always) lower magnetic fields than older devices. Another way to reduce current is to spread electricity over time. For example, it may be better to add a low power to the water heater all the time instead of a high power occasionally. The construction of the device is of great importance for the magnitude of the magnetic fields. Different types of electric felt, Electric radiators, electric floor heating, power supplies, etc. can cause radical differences in field strength. Sometimes a device change can be the best way to reduce the fields. This applies, for example, to switching from older electric radiators (elements with heat coils in air behind cover plate) to oil-filled elradiato- vectors. The new radiator has no measurable field at a greater distance than scarcely 50 cm. The design is important for the product's magnetic field. The transformer in the power supply is correctly sized instead of under-dimensioned (as you usually do to save weight), the magnetic fields are significantly lower. The same applies to electric motors, such as vacuum cleaners. The most important parameter that the designer can influence Is the enclosed area of ​​the current paths (loops) formed in the device. By always pulling return conductors adjacent to phase conductors, the area and thus the magnetic field are minimized. For electric felt, it means that the heating loop is laid out as a double loop instead of a single. For electric underfloor heating, the heating cable has a return conductor. For the elementary electrical cartridge, the oil-filled element was compact, while the heat coils of the old element meant large loops. Slinging in devices gives local magnetic fields which decrease rapidly with the distance. It is rare that you can measure a magnetic field more than a few meters away. Even large sources such as a transformer supplying a residential area with power provide fields that are inedible 2-10 meters away. A transformer outside the house is in itself no source of field in the house, however, the switch itself (if any) or vagabondering current can provide magnetic fields near a transformer that is more important than the transformer itself.