203: Electrical installation technology

What are the explicit purposes of Specifications and Drawings when planning an installation?

Specifications: Used to select the correct materials.

Drawings: Provide technical information on wiring systems and physical layouts

What is the main purpose of BS 7671 and its official Guidance Notes?

They state the national standards

What are the On-Site Guide and the Unite Union Book used for?

They serve as good working practices on site

Why do you need Manufacturers' Data and Client Needs?

Manufacturers' data: to make sure equipment works properly

Client needs: To make sure you install exactly what the customer asked for..

what is a TN-S System

A system having separate neutral and protective conductors throughout the system

what is TN-C-S system

A system in which neutral and protective functions are combined in a single conductor in the system