bsen60446-20xxbasicandsafetyprinciplesforman-machineinterfacemarkingandidentification—identif

bsen60446-20xxbasicandsafetyprinciplesforman-machineinterfacemarkingandidentification—identif内容摘要：

colours shall be in accordance with the requirements provided in Clause 5. Identification of conductors by alphanumerics shall be in accordance with the requirements provided in Clause 6. EN 60446:2020 – 7 – 5 Identification by colours General For identification of conductors, the following colours are permitted: – black, brown, red, orange, yellow, green, blue, violet, grey, white, pink, turquoise. NOTE This list of colours is derived from IEC 60757. The identification by colour shall be used at terminations and preferably throughout the length of the conductor either by the colour of the insulation or by colour markers, except for bare conductors where the colour identification shall be at termination and connection points. Identification by colour or marking is not required for – concentric conductors of cables, – metal sheath or armour of cables when used as a protective conductor, – bare conductors where permanent identification is not practicable, – extraneousconductiveparts used as a protective conductor, – exposedconductiveparts used as a protective conductor. Additional markings, for example alphanumerical, are allowed, provided that the colour identification remains unambiguous. Use of single colours Permitted colours The single colours green and yellow are only permitted where confusion with the colouring of the conductors in accordance with to is not likely to occur. Neutral or midpoint conductors W here a circuit includes a neutral or midpoint conductor identified by colour, the colour used for this purpose shall be blue. In order to avoid confusion with other colours it is remended to use an unsaturated colour blue, often called light blue. Blue shall not be used for identifying any other conductor where confusion is possible. In the absence of a neutral or midpoint conductor, a conductor identified by blue within the whole wiring system may also be used for any other purposes, except as a protective conductor. If identification by colour is used, bare conductors used as neutral or midpoint conductors shall be either coloured by a blue stripe, 15 mm to 100 mm wide in each unit or enclosure and each accessible position, or coloured blue throughout their length. NOTE 1 IEC 6007911 prescribes blue when a colour is used for the marking of terminal, terminal boxes, plugs and sockets of intrinsicallysafe circuits. NOTE 2 In the United States, Canada and Japan, the colour identification white or natural grey for the midpoint or neutral conductor is used as a replacement for the colour identification blue. ACphase conductors For ACphase conductors the preferred colours are BLACK, BROW N and GREY. EN 60446:2020 – 8 – NOTE 1 In the United States, Canada and Japan, where the colour GREY is used as a replacement for the colour identification BLUE for neutral or midpoint conductor, the colour GREY shall not be used for identification of phase conductors if confusion is likely. NOTE 2 In the United States, Canada and Japan, the colour GREY can be applied as identification of neutral or midpoint conductor, the colour GREY shall not be used for any other purpose than specified in this standard. NOTE 3 Neither a phasing nor a direction of rotation is implied by the colours given. Use of bicolour binations Permitted colours Combinations of any two of the colours listed in are permitted provided there is no risk of confusion. To avoid such confusion the colour green and the colour yellow shall not be used in colour binations other than the bination greenandyellow. The use of the bination of the colours greenandyellow is restricted to the purposes of to . Protective conductors Protective conductors shall be identified by the bicolour bination greenandyellow. NOTE 1 It may be necessary to provide additional marking to unambiguously identify a certain designated conductor. NOTE 2 An additional colour marking is required for PEN, PEL and PEM conductors. Greenandyellow is the only colour bination recognized for identifying the protective conductor. The colour bination greenandyellow shall be such that, on any 15 mm length of the conductor where colour coding is applied, one of these colours covers at least 30 % and not more than 70 % of the surface of the conductor, the other colour covering the remainder of that surface. If bare conductors, used as protective conductors, are provided with colouring they shall be coloured greenandyellow, either throughout the whole length of each conductor or in each partment or unit or at each accessible position. If adhesive tape is used, only bicoloured tape shall be applied. NOTE 3 W here the protective conductor can be easily identified by its shape, construction or position, for example a concentric conductor, colour coding throughout its length is not necessary but the ends or accessible positions should be clearly identified by the graphical symbol or the bicolour bination greenandyellow or the alphanumeric notation PE. NOTE 4 In the United States, Canada and Japan the colour identification green for the protective conductor is used as a replacement for the colour bination greenandyellow. NOTE 5 If extraneous conductive parts are used as a PE conductor identification by colours is not necessary. PEN conductors PEN conductors, when insulated, shall be marked by one of the following methods: – greenandyellow throughout their length with, in addition, blue markings at the terminations。 or – blue throughout their length with, in add。