New PDF release: A JTL Study Book for the Electrotechnical Industry. Industry

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If the customer asks the contractor to submit a second offer (for additional work, or simply to lower the price), the contractor is under no legal obligation to quote again. Each quote is self-contained: the terms or conditions for a previous quote do not automatically apply. Death of contractor - If the contractor dies before the offer is accepted the customer must be notified, otherwise customer could agree (within the offer time limit) and the contract would become valid. Breach of contract occurs when one of the parties does not fulfil the terms of the contract.

The main contractors are usually the builders, because they have the bulk of the work to carry out. But in refurbishment projects, where the amount of building work is small, the electrical contractor could be the main contractor. The main contractor acts as co-ordinator of all the individual sub-contractors, checks that they carry out their work properly and on time, and pays them for the work done. Nominated sub-contractors This type of sub-contractor is named (nominated) specifically in the contract by the client or architect to carry out certain work; the main contractor must use them.

58 JTL481 Rev1 08/04 Notes JTL481 Rev1 08/04 59 Notes 60 ©JTL481 Rev1 08/04 Electrical reference symbols (BS EN 60617) ©JTL481 Rev1 08/04 61 Electrical reference symbols (BS EN 60617) BS EN 60617 (which used to be known as BS 3939) gives a list of the standard symbols to be used on installation drawings. 1 Connections 1 Connections Wiring going upwards. If the arrow is pointing towards the top of the drawing sheet, the wiring goes upwards. 2 Sockets Wiring going downwards They are grouped under five headings: 3 Switches 4 Lighting outlets and fittings 5 Miscellaneous Wiring passing through vertically Box, general symbol Connection box Junction box Consumers terminal service entrance equipment.

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A JTL Study Book for the Electrotechnical Industry. Industry &Communication


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