BS EN ISO 10133:2017 ISO 10133:2012(E)


3.5 overcurrent protection device device designed to interrupt the circuit when the current flow exceeds a predetermined value for a predetermined time


EXAMPLE A fuse or circuit breaker.


3.6 panel board switchboard assembly of devices for the purpose of controlling and/or distributing electrical power


NOTE Examples of devices include circuit breakers, fuses, switches, instruments and indicators.


3.7 sheath uniform continuous tubular protective covering of metallic or non-metallic material, generally extruded, around one or more insulated conductors


NOTE Examples of suitable material include moulded rubber, moulded plastics, woven sleeving or flexible tubing.


3.8 trip-free circuit breaker mechanical switching device capable of making, carrying and breaking currents under normal circuit conditions and also making, carrying for a specified time and breaking currents under specified abnormal circuit conditions, such as those of short circuits, and which is designed so that the resetting means cannot be manually held in place to override the current interrupting mechanism


3.9 conduit part of a closed wiring system of circular or non-circular cross-sections for insulated conductors and/or cables in electrical installations allowing them to be drawn in and/or replaced


3.10 cable trunking system of closed enclosures comprising a base with a removable cover intended for the complete surrounding of insulated conductors, cables, cords and for the accommodation of other electrical equipment


3.11 system voltage(s) nominal voltage supplied to the d.c. distribution panel board (switchboard) from the power source


3.12 exposed conductive part conductive part of electrical equipment, which can be touched and which is not normally live, but which can become live under fault conditions


3.13 fuse protective device that interrupts the circuit irreversibly when the current flow reaches a specified value for a specific time


[SOURCE: ISO 8820-1:2008, 3.1]


3.14 fully insulated two-wire d.c. system system in which both positive and negative poles remain isolated from the ground (earth)


EXAMPLE Systems in which the positive and negative poles are not connected to the water through a metallic hull,


the propulsion system or earthed through the a.c. protective conductor. NOTE


2 Some systems may use a momentary ground connection for engine starting purposes and may remain isolated. © ISO 2012 – All rights reserved


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