Site Transformers

About Site Transformers

Site transformers are essential electrical equipment designed to convert 240v mains power down to 110v, the safer voltage standard required on construction sites and industrial environments across the UK. MyToolShed.co.uk stocks a comprehensive range of portable site transformers from trusted brands including Defender, Sealey, Draper, and Faithfull, with capacities ranging from compact 1kVA units through to heavy-duty 10kVA building site transformers.

These robust voltage converters enable tradespeople to safely power 110v tools and equipment, significantly reducing the risk of electric shock and ensuring compliance with health and safety regulations. Whether you need a lightweight transformer for occasional DIY projects or a high-capacity power pod for demanding commercial construction work, MyToolShed offers portable site transformers suitable for every application, alongside transformer accessories to enhance functionality and protection.

Applications

Site transformers are indispensable across numerous trades and industries:

• Construction and building sites – powering drills, saws, grinders and other power tools safely
• Electrical contractors – providing safe temporary power during installation and testing
• Groundworkers and civil engineers – operating heavy-duty equipment in outdoor environments
• Landscapers and gardeners – running professional garden equipment in domestic and commercial settings
• Joiners and carpenters – powering workshop machinery on-site
• Facilities maintenance – temporary power provision during repairs and upgrades
• Event and exhibition contractors – safe electrical distribution in public spaces
• Industrial workshops – operating 110v equipment for enhanced operator safety

Choosing The Right Site Transformers

Selecting the appropriate site transformer depends on several critical factors:

Power capacity (kVA rating): Calculate the total wattage of all tools you'll run simultaneously. A 1-1.5kVA transformer suits single power tools, while 3-3.3kVA models handle multiple tools or heavier equipment. Building sites requiring continuous operation of multiple high-draw tools need 5kVA or 10kVA transformers.

Portability requirements: Consider whether you need a lightweight unit for frequent transportation or a heavier-duty model for static site installation. Most portable transformers at MyToolShed.co.uk feature carry handles and robust construction for jobsite durability.

Socket configuration: Check how many 110v outlets you require and whether you need 16A or 32A sockets to match your power tool connections.

Continuous vs intermittent rating: Continuous-rated transformers can run at full capacity indefinitely, essential for heating equipment or all-day power tool use, whilst intermittent-rated units are suitable for occasional use with rest periods.

Safety Information

Always ensure your site transformer is rated for the total load you intend to power. Overloading transformers can cause overheating, damage and potential fire hazards. Check that units comply with relevant BS EN standards and feature thermal cut-out protection. Position transformers on stable, dry surfaces away from water and debris, and inspect cables regularly for damage. Never bypass safety features or use damaged equipment. Step-up transformers that convert 110v back to 240v require particularly careful handling and should only be used by competent persons who understand the increased electrical risks.

Frequently Asked Questions

Why do UK building sites use 110v instead of 240v?

The 110v centre-tapped-to-earth system reduces the voltage to earth to just 55v, making electric shocks far less likely to cause serious injury or death. This safety standard is mandated on most construction sites and recommended wherever power tools are used in challenging or wet conditions.

What kVA transformer do I need for my tools?

Add up the wattage of all tools you'll use simultaneously and divide by 1000 to get kW, then add 20-30% safety margin. As a guide: 1.5kVA suits a single heavy-duty tool, 3kVA handles 2-3 tools, and 5kVA or above is ideal for multiple users or continuous operation.

Can I use a site transformer indoors?

Yes, portable site transformers can be used indoors in workshops, garages and industrial units. Ensure adequate ventilation around the unit as transformers generate heat during operation, and always position on a stable, non-flammable surface.