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Questions
Questions about Electrical Contract Works
Plain answers to common questions on this service, grouped by what you are trying to find out. Each answer starts with the direct reply.
Basics
- What is an electrical load calculation and why is it done first?Learn what an electrical load calculation is and why designers prepare it before choosing cables, panels or a supply arrangement for a building.
- What is earthing and why is it tested so carefully in a new installation?Understand what earthing does in an electrical installation and why testing it carefully before handover protects people and equipment.
- What is a single-line diagram and why should I ask for one?A single-line diagram is the one-page map of an electrical installation, and asking for one helps you compare quotes and manage the work.
Process
- How should I work out the connected load before applying for a power connection?A plain guide to listing your equipment and preparing a connected load figure before you apply to the supply authority for a power connection.
- What does an electrical contractor need to see on the site before quoting?Find out which drawings, load details and site conditions an electrical contractor should review before giving you a reliable written quotation.
- What protective devices should a commercial installation include for safety?A general overview of the breakers, earth leakage protection and surge protection a commercial electrical installation commonly includes for safety.
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