Prolonging of the interruption beyond the critical time can cause a loss of production or lower productivity. E.g.: sanitary water heating circuit.ДЄ power interruption causes temporary discomfort for the occupants of a building, without any financial consequences. The load or the circuit can be вЂњshedвЂќ at any time. This is expressed in terms of the criticality of supplying of loads or circuits. Deterioration of the production facilities or loss of sensitive data,.We can distinguish various levels of severity of an electrical power interruption, according to the possible consequences: Short interruption acceptable: interruption time Long interruption acceptable: interruption time > 3 minutes.вЂњSheddableвЂќ circuit: possible to shut down at any time for an indefinite duration.The aptitude of a circuit to accept a power interruption. localized loads: the loads are generally high power and localized in several areas of the building (non-uniform density).Д®.g.: HVAC Voltage Interruption Sensitivity Definition:.intermediate distribution: the loads are generally of medium power, placed in groups over the whole building surface areaД®.g.: machines for assembly, conveying, workstations, modular logistics вЂњsitesвЂќ.Uniform distribution: the loads are generally of an average or low unit power and spread throughout the surface area or over a large area of the building (uniform density).It's the maximum power and apparrent power demands actually required to dimension the installation (see Power loading of an installation for more information):ДЄ characteristic related to the uniformity of load distribution (in kVA / m 2) over an area or throughout the building. industrial building: extension, splitting and changing usage.Operating flexibility: the position of loads will fluctuate, according to process re-organization.Implementation flexibility: the loads can be installed after the installation is commissioned.Flexibility of design: the number of delivery points, the power of loads or their location are not precisely known.No flexibility: the position of loads is fixed throughout the lifecycle, due to the high constraints related to the building construction or the high weight of the supplied process.Flexibility is a criterion which also appears due to the uncertainty of the building during the pre-project summary stage. Possibility of easily moving electricity delivery points within the installation, or to easily increase the power supplied at certain points. Enhanced: special measures are taken to allow maintenance operations without disturbing the installation operations.Example: several transformers with partial redundancy and load shedding. These operations must be preferably scheduled during periods of low activity. Standard: maintenance operations can be carried out during installation operations, but with deteriorated performance.Minimum: the installation must be stopped to carry out maintenance operations.Enhanced: this level of service reliability can be obtained by special measures taken to reduce the probability of interruption (underground network, strong meshing, etc.)ДЇeatures input during design to limit the impact of maintenance actions on the operation of the whole or part of the installation.Minimum: this level of service reliability implies risk of interruptions related to constraints that are geographical (separate network, area distant from power production centers), technical (overhead line, poorly meshed system), or economic (insufficient maintenance, under-dimensioned generation).The ability of a power system to meet its supply function under stated conditions for a specified period of time. High: no constraints.The position of the electrical equipment can be defined to best satisfy the criteria.Medium: the position of the electrical equipment is partially imposed, to the detriment of the criteria to be satisfied.Low: the position of the electrical equipment is virtually imposed.use of technical corridors (per floor),.Systems or premises designed and constructed for the transport and utility operation ДЄrchitectural characteristic of the building(s), taking into account the number of buildings, number of floors, and of the surface area of each floor.Д¬haracteristic taking into account the constraints in terms of the layout of the electrical equipment in the building:.Premises designed and constructed for manufacturing and processing of operations.Premises designed and constructed for commercial operations.Premises designed and constructed for private habitation.Among the definitions proposed by IEC6 В§ 3.4, mainly those listed below are part of this chapter.

Building electrical installation