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Download Allied Electronics Data Handbook by N. Cooke PDF

By N. Cooke

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Combines a certain amount of flexibility with mechanical strength and durability. 10 As above but insulation is XLPE. Cross (X) linked (L) poly (P) ethylene (E) For use in high temperature areas As above. 11 HOFR sheathed cables (heat, oil, flame retardant) All areas where there is a risk of damage by heat, oil or flame These are usually flexible cords. 9 Steel wire armoured. PVC insulated PVC sheathed with copper conductors, clipped direct to a surface or on cable tray or in ducts or underground Diversity The application of diversity to an installation permits, by assuming that not all loads will be energized at the same time, a reduction in main or sub-main cable sizes.

Isolation can also be achieved by the removal of fuses, pulling plugs, etc. e. light switches, switches on socket outlets, etc. e. a one-way light switch provides isolation for lamp replacement provided the switch is under the control of the person changing the lamp. Switch-fuse At the origin of an installation or controlling sub-mains or final circuits These can perform the function of isolation while housing the circuit protective devices. Fuse-switch As for switch-fuse Mainly used for higher current ratings and have their fuses as part of the moving switch blades.

This is best achieved by using a proving unit. This is simply a pocket-sized device which electronically produces 230 V dc. 3 Carry out the test to verify the circuit is dead. 4 Return to the proving unit and check the lamp again. It has long been the practice when using a test lamp to probe between phase and earth for an indication of a live supply on the phase terminal. However, this can now present a problem where RCDs exist in the circuit, as of course the test is applying a deliberate phase-to-earth fault.

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