Electrical installations of buildings –. Part Selection and erection of electrical equipment –. Wiring systems. Reference number. IEC (E). Part Selection and erection of electrical equipment -. Wiring systems The text of the International Standard IEC , prepared by IEC TC 64, Electrical installations and SR HD - PDF. International Standard IEC has been prepared by IEC technical Part of IEC deals with the selection and erection of wiring systems.
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IEC Low Voltage Electrical Installations Part - Download as PDF File ( .pdf), Text File .txt) or read online. IEC - Download as PDF File .pdf) or read online. International standard. IEC Low Voltage Electrical Installations Part Uploaded by. Part Selection and erection of electrical equipment – Wiring systems The International Electrotechnical Commission (IEC) is the leading global.
In such a case. Multi-core cable in conduit on a wooden or masonry wall or spaced less than 0,3 x conduit diameter from it C. Jump to Page. Other considerations affect the choice of the cross-sectional area of conductors. Where the cables or insulated conductors are subject to such radiation. T H Hill Associates, Inc.
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International Union of Railways UL: UL ULC: United Nations UNI: The U. Verband der Automobilindustrie VDE: Welding Consultants, Inc. World Scientific Publishing Co. Yakuji Nippo. IEC 3rd Edition, October Complete Document. Includes all amendments and changes through Corrigendum 1, February Detail Summary View all details. Additional Comments: Price USD. Single User. In Stock.
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Corporate Sustainability. Investor Relations. All Rights Reserved. The thermal resistivity of the enclosure is assumed to be poor because of the material of construction and possible air spaces. For multi-core cable installed in method Where the construction is thermally equivalent to methods of installation 6.
De is the external diameter of conduit or vertical depth of cable ducting. J I De is the external diameter of the conduit. The factors in Table B. The ambient temperature the top of the vertical section can be increased considerably. Where there is more than one circuit in the trunking the group reduction factor given in Table B. Where the construction is thermally equivalent to methods of installation 6 or 7.
The matter is under consideration. For the time being. NOTE For cables and insulated conductors in air.
This is also applicable to nonarmoured single-core cables in single way metallic ducts see For buried cables. The values in Tables B. This annex may be applied for armoured multi-core cables but does not apply to armoured single-core cables.
Known practical variations in cable construction e. Current-carrying capacities of insulated conductors are the same as for single core cables. Other considerations affect the choice of the cross-sectional area of conductors. For multi-core cables having conductors with a cross-sectional area of 25 mrn? Tabulated values have been derived from dimensions appropriate to shaped conductors.
Tabulated current-carrying capacities have been selected so as to take account of this spread of values with safety and to lie on a smooth curve when plotted against conductor cross-sectional area.
The cable supplier should be consulted. NOTE 1 If armoured single-core cables are used. Where the cables or insulated conductors are subject to such radiation.
This value is considered necessary as a precaution for worldwide use when the soil type and geographical location are not specified see IEC NOTE 1 Group reduction factors have been calculated as averages for the range of conductor sizes. When a group contains various sizes of cable or insulated conductor.
The following notes concern 8. Attention is drawn to the notes under each table. In locations where the effective soil thermal resistivity is higher than 2. In some instances. NOTE 2 Group reduction factors have been calculated on the basis that the group consists of similar equally loaded insulated conductors or cables. For installations on perforated cable trays.
For other installations. Where more insulated conductors or cables. Correction factors for soil thermal resistivities other than 2.
No group reduction factors are required for bare mineral insulated cables not exposed to touch. Such cases can usually be recognized by very dry ground conditions. The group reduction factor obtained in accordance with B. Such factors cannot be tabulated but shall be calculated for each group The method of calculation of such factors is outside the scope of this standard.
A group of similar cables is taken to be a group where the current-carrying capacity of all the cables is based on the same maximum permissible conductor temperature and where the range of conductor sizes in the group spans not more than three adjacent standard sizes.
The conduit is. Some specific examples of where such calculations may be advisable are given below. Such under-utilization can be avoided if large and small sizes of cable or insulated conductor are not mixed in the same group The use of a method of calculation specifically intended for groups containing different sizes of insulated conductors or cables in conduit will produce a more precise group reduction factor.
NOTE A group containing sizes of conductor spanning a range of more than three adjacent standard sizes may be considered as a group containing different sizes. The wall consists of an outer weatherproof skin. This subject is under consideration.. It is preferable to use a method of calculation specifically intended for groups containing different sizes of cables. This subject is under consideration. The calculation of reduction factors for groups containing different sizes of equally loaded insulated conductors or cables is dependent on the total number in the group and the mix of sizes.
Where the cable is fixed to or embedded in a masonry wall the current-carrying capacity may be higher. This is similar to reference method C. If the heat of the sheath dries out the soil. The conduit can be metal or plastic. Heat from the cables is assumed to escape through the inner skin only. Conduit mounted on a wooden wall so that the gap between the conduit and the surface is less than 0. Cables drawn into mm diameter plastic. Care shall be taken that natural air convection is not impeded.
The conduit can be metal or plastic Where the conduit is fixed to a masonry wall the current-carrying capacity of the cable or insulated conductors may be higher. F and G. NOTE 1 The term "masonry" insulating materials. In practice. Heating due to solar radiation and other sources shall be taken into account. One way of avoiding this heating is to use the tables for 70 'C conductor temperature even for cables designed for 90 'C. Cables laid in direct contact with soil having thermal resistivity 0.
These formulae with appropriate coefficients are given in Annex D. NOTE 6 Where a junction box in the ceiling is used for supply to a luminaire. It is not implied that all these items are necessarily recognized in national rules of all countries.
It may be necessary to apply the correction factors due to higher ambient temperatures that may arise in the junction boxes and similar mounted in the ceiling. NOTE 4 Table 8. NOTE 5 For convenience where computer-aided installation design methods are employed.
General notes to Tables 8. Installation reference methods forming basis of tabulated current-carrying capacities Table and column Current-carrying for single Reference method of installation Thermoplastic insulated capacities circuits Mineral insulated Ambient temperature factor Group reduction factor Thermosetting insulated Number of cores 2 3 2 1 Insulated conductors singlecore cables in conduit in a thermally insulated wall Multi-core cable in conduit in a thermally insulated wall 2 3 4 2 and 3 7 3 5 6 8 9 A1 Room B.
Sheathed singlecore or multi-core cables direct in the ground. Values for larger. Current-carrying capacities in amperes for methods of installation in Table 8. Values for larger sizes relate to shaped conductors and may safely be applied to circular conductors.
Current-carrying capacities in amperes for methods of installation in Table B. Values for larger sizes relateto shaped conductors and may safely be applied to circular conductors. Number and arrangement Two loaded conductors twin or single-core Nominal cross-sectional area of conductor rnrn?
For bare cables exposed to touch. Current-carrying capacities in amperes for installation method C of Table 8. Current-carrying capacities in amperes for installation method C of Table B. F and G of Table B. Current-carrying capacities in amperes for installation methods E.
The values of V and V are the rated voltage of the cable. De is the external diameter of the cable. F and G of Table 8. Installation Multi-core Two loaded conductors cables Three loaded conductors Two loaded conductors touching Three loaded conductors trefoil methods of Table B. NOTE 2 for larger sizes relate to De is the external diameter of the cable. Values 1 1 - - - - - NOTE 1 Circular conductors are assumed for sizes up to and including shaped conductors and may safely be applied to circular conductors.
Touching Spaced Horizontal flat Nominal crosssectional area of conductor mm-' Method 1 1. NOTE 2 08 is the external diameter of the cable. Values for larger sizes relate to. NOTE 2 De is the external diameter of the cable. Installation Multi-core Two loaded conductors cables Two loaded Nominal crosssectional area of conductor mm2 Three loaded conductors conductors touching Three loaded conductors trefoil methods of Table 8. If partial drying out of the soil is foreseen. No allowance had been made for the possibility of moisture migration which can lead to a region of high thermal resistivity around the cable.
NOTE 4 It is assumed that the soil properties are uniform. NOTE 2 The correction factors are applicable to cables drawn into buried ducts.
Correction factors for cables buried direct in the ground or in buried ducts for soil thermal resistivities other than 2. NOTE 3 The correction factors are applicable to ducts buried at depths of up to 0.
Where more precise values are required they may be calculated by methods given in the lEe series. NOTE 3 are applicable clearances to uniform between groups adjacent of cables. NOTE 8. NOTE 5 If a group consists of n single-core circuits of three loaded conductors.
These factors Where 1. Reduction factors for one circuit or one multi-core cable or for a group of more than one circuit. NOTE 4 If a system consists of both two.
NOTE 2 In case of a thermal resistivity lower than 2. Where more precise values are required they may be calculated by methods given in IEC The process of averaging.