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Unlike ATEX which uses numbers to define the safety "Category" of equipment (namely 1, 2, and 3), the IEC continued to utilise the method used for defining the safe levels of intrinsic safety namely "a" for zone 0, "b" for zone 1 and "c" for zone 2 and apply this Equipment Level of Protection to all equipment for use in hazardous areas since ...
Zone 22 – ...is not likely to occur in normal operation but, if it does occur, will persist for a short period only. Effective ignition source "Effective ignition source" is a term defined in the European ATEX directive as an event that, in combination with sufficient oxygen and fuel, can cause an explosion.
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A zone valve is a specific type of valve used to control the flow of water or steam in a hydronic heating or cooling system. In the interest of improving efficiency and occupant comfort, such systems are commonly divided up into multiple zones. [ 1 ]
After hip replacement, hip prosthesis zones are regions in the interface between prosthesis material and the surrounding bone. These are used as reference regions when describing for example complications including hip prosthesis loosening on medical imaging .
The zones are defined by steps of 5 degrees Celsius, from −15–−10 °C for zone 1 to 15–20 °C for zone 7. [36] They are numerically about 6 lower than the USDA system. For example, Australian zone 3 is roughly equivalent to USDA zone 9.
Barrovian zones are especially easy to recognize in pelitic rocks. The prograde sequence of Barrovian zones is: chlorite - biotite - garnet - staurolite - kyanite - sillimanite Andalusite crystals in Dalradian metamorphic rock at Boyndie Bay in the Buchan metamorphic zone of north-east Scotland. Often only part of the series can be found.
The western structure (right) is the seat of the Municipal Council of Zone 1, while the eastern (left) houses Museo del Novecento The area has its own local authority called Consiglio di Municipio (Municipal Council), composed by a president and 30 members directly elected by citizens every five years.