48www.se.comPrecalculating XLPE or PVC cables + CanalisDrawn from the Ecodial low-voltage installation-calculation software, the information provided here assists in defining busbar trunking (cables and Canalis) and their protection in compliance with installation standards and calculation guide.Protection of the main busbar trunking (cable + Canalis) bThe tables below may be used to determine: vthe rated current (In) or the setting current (Ir) of the overload-protection devices, vthe rated current (Inc) of Canalis, vthe thermal minimum cross-section of cables. bThese three characteristics are defined for the following installation conditions: vmaximum ambient temperature 30°C, vcables placed in cable trays. Layout as a single horizontal layer or in groups of 2 or 3 cores.Connector protectionCanalis connectors must have overload protection. The connector is created using a fused connector unit to protect the cable (C3) and the device against short-circuits.This protection offers good discrimination during operation (continuity of service, trouble-shooting, etc.).For lighting, it may be useful to take advantage of the possibilities for dispensing with or remotely locating the protection, offered by standard IEC 60364-4-43 (§ 433 and 434) and summarised in the texts below, drawn from UTE C 15-107.The connector is created using a pre-wired connector unit.Supply to devices not subject to overloadsExemption possibilities: bthe C3 cable (connection to the device) does not need to be protected against overloads (NF C 15-100, 473.1.2b) or short-circuits (NF C 15-100, 473.2.2.1) because the cable: vis not subject to overload currents, vdoes not have connectors or power sockets, vis less than or equal to three metres, vis designed to reduce to a minimum the risk of short-circuits, vis not located near any flammable material. Example: luminaires, convectors, etc.Supply to devices with built-in overload protectionExemption possibilities: bthe device P2 protecting C3 cable against overloads is not positioned at the head (NF C 15-100, 473.1.1.2 b) of C3 because the latter: vdoes not have connectors or power sockets, vis less than or equal to three metres, vis designed to reduce to a minimum the risk of short-circuits, vis not located near any flammable material. NB: P1 - P2 are short-circuit protection devices.Design guideSelect the overload protection
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