A6 An immersion electric water heater rated at 220V, 2kW is to be installed using a 2-core-and-earth PVC-insulated and sheathed, non-armoured cable. The supply will be taken for an existing 15A spare way in a consumer's unit containing semi-enclosed (rewirable) fuses to BS3036. The supply cable will run for such of its 14 meter length in a roof space which is thermal insulated with glass fiber. The roof space ambient temperature is expect to be 35C in summer and, where leaving the consumer's unit, the cable will be bunched with seven other 2 core-and earth cables. i) What is the design current of the circuit? ii) iii) There are fuses of 5A, 8A and 15A, which one will you choose and why? Find the Current Carrying Capacity (CCC) of the conductors? Given condition of: - Ambient temperature factor is 0.97; - Grouping factor is 0.52; - Thermal insulation factor is 0.5; - Factor for the type of protective devices is 0.725.

A6 An immersion electric water heater rated at 220V, 2kW is to be installed using a 2-core-and-earth PVC-insulated and sheathed, non-armoured cable. The supply will be taken for an existing 15A spare way in a consumer's unit containing semi-enclosed (rewirable) fuses to BS3036. The supply cable will run for such of its 14 meter length in a roof space which is thermal insulated with glass fiber. The roof space ambient temperature is expect to be 35C in summer and, where leaving the consumer's unit, the cable will be bunched with seven other 2 core-and earth cables. i) What is the design current of the circuit? ii) iii) There are fuses of 5A, 8A and 15A, which one will you choose and why? Find the Current Carrying Capacity (CCC) of the conductors? Given condition of: - Ambient temperature factor is 0.97; - Grouping factor is 0.52; - Thermal insulation factor is 0.5; - Factor for the type of protective devices is 0.725.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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