Design- Documentation

Specific guidance is given to the selection of cables, isolation, switching, and inspection and testing for electrical installations in the:

• IET Wiring Regulations

• Electricity Supply Regulations

• Electricity at Work Regulations

• Health and Safety at Work Act

Exploded views in manufacturers’ manuals are generally used to show

• Large machine parts

• Machines having few parts

• Wiring diagrams of machines and systems

• Complex components having many parts

Answer explanation

An electrical contractor, compiling a list of materials and equipment required to complete an installation, will need access to

• Delivery records

• Drawings and specifications

• Circuit diagram

• Day work sheets and variations

Answer explanation

Installation drawings are usually to scale meaning position of equipment/accessories can be transferred from the drawing to the correct position. 1:50, 1:100, 1:150 etc are common scales that are used.

Circuits that are used to measure and control temperature, air flow and humidity in a building are called

• Emergency management circuits

• Environmental control circuits

• Power control circuits

• Security con

A line on a drawing measuring 200mm, representing a wall on a site measuring 200m will be drawn to a scale of

• 1:500

• 1:1,000

• 1,000:1

• 500:1

When deciding the maximum fixing distances for conduit saddles, reference should be made to

• BS 7671 

• On-Site Guide 

• Guidance notes 3 

• The Electricity at Work Regulations

Answer explanation

The IET Wiring Regulations 18th Edition-Amendment 2 is the comprehensive, detailed guide to electrical installation, design and maintenance in the UK. It contains multiple updates from the 17th Edition which are intended to make electrical installations more effective, safer and more efficient.