10. Typical installation methods and related reference methods Installation method Reference methods Cables in conduit and multi-core cables in a thermally insulated wall A Cables in conduit, trunking, ducting or building voids. Single-core or multi-core cables fixed directly under a wooden or masonry ceiling. B Clipped direct C Cables laid direct in ground or in ducts in ground D Cables on perforated tray, brackets, wire-mesh tray, ladder E or F Flat twin and cpc cables (Table 4D5) 100,101, 102 & 103
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13. Typical arrangement of rising main Busbar Trunking Applications include multi-storey commercial or domestic properties. ‘ Rising main’ Busbar Trunking systems are often used to provide supplies to individual floors within buildings
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16. Chapter 521.5 Electromagnetic effects All cables to pass through the same entry/exit hole
17. Chapter 521.5 Electromagnetic effects Non-ferromagnetic metal or non-metallic entry plate to be used
18. Chapter 521.5 Electromagnetic effects Ferro-magnetic fixing plate may be used provided slots are cut in plate between conductors
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Notes de l'éditeur
Refer to Appendix 4. Use of Appendix 4 will covered in more detail in Section 523/525. For now it is worth getting students used to finding installation methods and their related reference method.
Refer to Appendix 4. Use of Appendix 4 will covered in more detail in Section 523/525. For now it is worth getting students used to finding installation methods and their related reference method.
Refer to Appendix 4. Use of Appendix 4 will covered in more detail in Section 523/525. For now it is worth getting students used to finding installation methods and their related reference method.
The following slides illustrate busbar and powertrack systems. Bs 7671 does not contain any specific detailed requirements (apart from using the correct British Standards). However Appendix 8 should be quickly referred to. Generally manufacturers information/recommendation should be followed.
Such systems (often overhead) are also used to supply machinery, providing flexibility when the connected equipment may require frequent movement.
Conductors of a.c. circuits installed in ferromagnetic enclosures (such as steel conduit, trunking or ducting) must be arranged so that the conductors of all line and the related neutral conductor (if any) and the appropriate protective conductor of each circuit are contained in the same enclosure.
Where conductors enter a ferromagnetic enclosure, they must be arranged so that they are not individually surrounded by ferromagnetic material, or other provision must be made to prevent eddy (induced) currents. (Using non-ferromagnetic plate)
Where conductors enter a ferromagnetic enclosure, they must be arranged so that they are not individually surrounded by ferromagnetic material, or other provision must be made to prevent eddy (induced) currents. (Using slots)
Refer to Sections 521.6 and 521.10. Many of these Regulations are covered in later sections of Part 5. Regulation 521.7/521.8 has already been covered in Part 3 and Section 528 covers the segregation issues in depth 521.9 requires the use of flexible cables where equipment is intended to be moved etc and requires flexible cables only to be used where the relevant provisions of the regulations are met. 521.10 is very important (521.10.1) being the regulation confirming that non-sheathed cables must be provided with mechanical protection. For circuit protective conductors see Regulation 543.1.1 (4.0 mm 2 minimum without mechanical protection)
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