What does a commercial electrician actually do?
You work in buildings people use for business or public services: offices, retail units, schools, hospitals and similar. A large part of the job is containment. That means fixing cable tray, basket, ladder, trunking and conduit, then pulling cable through it. On larger jobs the containment often goes onto steel purlins in a roof space or onto the underside of concrete mezzanine floors. After that comes the wiring, then the final fix: lighting, small power, distribution boards, and links to fire alarm and emergency lighting.
The national occupational standard for electricians covers installation, testing and maintenance on AC and DC, on both single and three-phase supplies. It also lists mains-powered life safety systems in commercial buildings. Three-phase distribution is routine on commercial work, and it is far less common in houses. Before handover you test and certify what you have installed, and every record has to be accurate.
Working to drawings and specifications
On a commercial job you rarely decide the cable route yourself. The designer issues layout drawings, schematics and a specification. Contract specifications usually call for drawings showing tray and trunking routes with their sizes, conduit runs and distribution schematics. The standard expects a qualified electrician to set out the work from those drawings and order the right materials.
The specification can be very detailed. One local authority specification, for example, has trunking fixed at no more than 1,500mm intervals. Where non-metallic trunking passes through a fire barrier, it must run in steel trunking for at least 300mm on each side. Fire rating matters because containment carrying life safety cables has to stay up in a fire. Learn to read the spec before you pick up a drill.
How it differs from domestic work
Domestic electricians mostly work in occupied homes, often alone, dealing directly with the homeowner. Commercial electricians usually work in a gang on a construction site run by a main contractor. Site inductions, permits and a programme of works set the pace. You coordinate with other trades, work at height on access equipment and may spend months on one building.
The card scheme draws a clear line between the two. The ECS Domestic Electrician gold card is limited to domestic settings. The Installation Electrician gold card covers low voltage installation, commissioning and maintenance in general. If you trained on the domestic route and want commercial site work, plan to get the broader Level 3 qualification or the experienced worker route.
Where the job leads
The National Careers Service lists site supervision, estimating and contract management, and electrical design as next steps for experienced electricians. Commercial work is a good base for all three, because you get used to drawings, programmes and working with other trades. Some electricians move into testing and inspection, data centres or maintenance roles in the same kinds of buildings. Others go self-employed and subcontract to the bigger commercial firms.
Pay
GBP a year, before tax. JIB rows are the official National Standard Rates for job-employed electricians from 5 January 2026, set by the JIB Industrial Determination 2026-2028 and annualised at 37.5 hours over 52 weeks. Percentile ranges are modelled from ONS ASHE April 2026 provisional data, uprated to 2026, and regional figures are estimates. Overtime, travel, nights and London work push earnings up. Refer to the Electricians salary guide for figures from live adverts.
What you need
- Level 3 qualificationA JIB-recognised UK Level 3 apprenticeship standard, a JIB-approved competency-based NVQ, or an equivalent. This is the first condition for the Installation Electrician gold card.
- ECS HS&E assessmentThe gold card requires you to hold a current ECS Health, Safety and Environmental Assessment.
- BS 7671:2018 qualificationThe gold card also requires a recognised qualification in BS 7671:2018, the Wiring Regulations.
- ECS Installation Electrician gold cardThis card is for skilled Level 3 electricians who work without supervision on low voltage installation, commissioning and maintenance. Commercial sites usually ask to see it.
- Working knowledge of site lawThe occupational standard expects you to comply with the Health and Safety at Work Act, the Electricity at Work Regulations, the Work at Height Regulations and BS 7671.
Across the UK
| England, Wales and Northern Ireland | The Joint Industry Board administers the ECS card scheme, including the Installation Electrician gold card. |
|---|---|
| Scotland | The Scottish Joint Industry Board handles ECS applications and information throughout Scotland. |
How to get there
- Year 0Start an apprenticeshipJoin an electrical contractor on the Level 3 Installation and Maintenance Electrician apprenticeship. Commercial firms often recruit apprentices directly. Most entrants have English and maths at Level 2.
- Years 1-4Learn on siteFix containment, pull cable and do second fix under supervision, while learning theory at college. The original standard put typical completion at 48 months for a new starter.
- Year 4Complete Level 3 and BS 7671Pass the end-point assessment and hold a recognised BS 7671:2018 qualification and a current ECS HS&E assessment.
- Year 4Get your gold cardApply for the ECS Installation Electrician gold card so you can work unsupervised on commercial sites.
- Years 5-8Build experienceTake on bigger packages, run small gangs and get comfortable with drawings, testing and handover paperwork.
- Year 8+Move up or acrossMove into supervision, estimating, design, or testing and inspection, or go self-employed.
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Questions people ask
Can I do commercial work with a Domestic Electrician gold card?
The ECS Domestic Electrician gold card covers installing and maintaining electrical services in a domestic setting only. Commercial sites usually want the Installation Electrician gold card, which needs the broader Level 3 qualification or an equivalent.
I have years of experience but no Level 3. What can I do?
The Experienced Worker Assessment lets experienced electricians get their skills recognised at Level 3 standard. The National Careers Service says there are two routes, one needing at least three years' experience and the other five. Meanwhile, Labourer and Experienced Worker ECS cards can give you site access.
What is containment?
Containment is the system that supports and protects cables: tray, basket, ladder, trunking and conduit. On commercial jobs the contractor usually sizes and installs it to the routes shown on the drawings. It has to suit the cable load and meet any fire rating in the specification.
Do commercial electricians work on three-phase?
Yes. The national standard expects electricians to install, test and maintain both single and three-phase systems. Commercial buildings usually take a three-phase supply, so you will work on distribution boards and submains regularly.
What is the JIB hourly rate for a commercial electrician?
From 5 January 2026 the JIB National Standard Rate for a job-employed Electrician is £18.38 an hour. An Approved Electrician gets £20.08 and a Technician £22.70. Many commercial contractors pay JIB rates, though some pay above them.
Sources
- ECS: Installation Electrician gold card
- ECS: Domestic Electrician gold card
- National Careers Service: Electrician job profile
- Skills England: Installation and maintenance electrician occupational standard
- Skills England: Installation electrician and maintenance electrician standard v1.0
- IET: Cable tray selection article
- Southampton City Council: Standard electrical specification
- Contracts Finder: Electrical specification with drawing requirements
