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FAQs

Add up the wattage of all tools and lighting that may run simultaneously, divide by 110 to get amps, multiply by 110 to get VA. For a small site running 1-2 tools at a time (drill at 700W, light at 100W, pad of margin), 1.5-3.3 kVA is sufficient. For a typical site running 3-5 tools simultaneously plus lighting (5-7 kW total), 5 kVA is the standard. For larger sites with high-current 110V breakers and large grinders running simultaneously, 10 kVA and above transformers are required.

UK HSE / CDM guidance: 110V centre-tapped supply gives only 55V from each line to earth — significantly less likely to cause fatal electric shock if a tool's flex is damaged, cut by accident, or the operator contacts a live wire while standing on damp ground. The reduced voltage doesn't reduce tool performance significantly (tools are designed for the rating). Most insurers and site managers require 110V tools on UK sites; some refuse insurance for sites running 230V tools.

Yes — provided the simultaneous load doesn't exceed the transformer's VA rating. Most trade site transformers have 2-4 output sockets, allowing several 110V tools and lights to be plugged in. Typically only some of those plugged-in items will run simultaneously — calculate based on actual simultaneous load, not total connected load. Trip-out from thermal overload indicates the simultaneous load is too high.

A transformer steps voltage down (or up) using electromagnetic induction — passive, reliable, no moving parts. A site transformer takes 230V AC and outputs 110V AC. An inverter typically takes DC (battery) and outputs AC at a chosen voltage — active electronics, used for portable AC power from battery sources. For site-power from mains supply, a transformer is the correct choice; for portable battery-fed AC power, an inverter.

Every product is backed by our Fit Guarantee. If a part is incompatible with your machine, you can return it hassle-free. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will arrange collection. For other returns, email us first to obtain a Return Merchandise Number before sending. Returns are accepted within 30 days of purchase, in original packaging, on UK orders. A restocking fee may apply on returns where the buyer has changed their mind. Refunds are issued to the original payment method once the return is inspected.

Delivery time depends on the product, your destination, and availability — the estimated time for any item appears on the product page, and "Check where we deliver" confirms coverage for your postcode before you order. Next-day delivery is available on most products; the option appears at checkout when applicable. We deliver across the UK, Europe, the Middle East, and Africa. Use the country selector at checkout to confirm coverage and delivery options for your destination.

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Site Transformers

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Within Ground Working and Structural Tools, Site Transformers covers the 110V step-down transformers used to feed HSE-compliant 110V centre-tapped tools and lighting on UK construction and civil-engineering sites — taking a standard 230V single-phase site supply and outputting 110V for safer operation in damp, dusty, ground-contact conditions.

Parts for Machines supplies site transformers across the trade and contractor ranges, with rated outputs typically running from 1.5 kVA (single-tool feed for very small sites) up to 10 kVA and above (multi-tool sites with simultaneous high-current loads). Transformers are housed in robust steel cabinets with 110V CEE-form output sockets and integrated thermal protection.

We are an authorised distributor and seller of SIP, Sealey, and Draper across the site transformer range. SIP and Sealey lead the line — covering trade-grade transformers in the standard 3.3 kVA, 5 kVA, and 10 kVA output ratings used on most UK construction sites. Draper extends the range with workshop and home-shop variants at competitive trade pricing.

Product pages list the rated output VA (kilovolt-amps — the simultaneous load the transformer can feed), the input voltage (typically 230V single-phase), the output voltage (110V centre-tapped — gives 55V from each line to earth, the HSE-recommended low-voltage standard), the output socket count and rating (typically 16A or 32A CEE-form sockets), the thermal protection (auto-reset thermal cut-out is standard), the IP rating (typically IP44 for site use), and the cable type and length supplied. The transformer's output rating must equal or exceed the simultaneous-load total of all tools and lighting connected. Trade pricing on multi-unit and site fit-out orders is available; contact the team via WhatsApp 07754288583.

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FAQs

Add up the wattage of all tools and lighting that may run simultaneously, divide by 110 to get amps, multiply by 110 to get VA. For a small site running 1-2 tools at a time (drill at 700W, light at 100W, pad of margin), 1.5-3.3 kVA is sufficient. For a typical site running 3-5 tools simultaneously plus lighting (5-7 kW total), 5 kVA is the standard. For larger sites with high-current 110V breakers and large grinders running simultaneously, 10 kVA and above transformers are required.

UK HSE / CDM guidance: 110V centre-tapped supply gives only 55V from each line to earth — significantly less likely to cause fatal electric shock if a tool's flex is damaged, cut by accident, or the operator contacts a live wire while standing on damp ground. The reduced voltage doesn't reduce tool performance significantly (tools are designed for the rating). Most insurers and site managers require 110V tools on UK sites; some refuse insurance for sites running 230V tools.

Yes — provided the simultaneous load doesn't exceed the transformer's VA rating. Most trade site transformers have 2-4 output sockets, allowing several 110V tools and lights to be plugged in. Typically only some of those plugged-in items will run simultaneously — calculate based on actual simultaneous load, not total connected load. Trip-out from thermal overload indicates the simultaneous load is too high.

A transformer steps voltage down (or up) using electromagnetic induction — passive, reliable, no moving parts. A site transformer takes 230V AC and outputs 110V AC. An inverter typically takes DC (battery) and outputs AC at a chosen voltage — active electronics, used for portable AC power from battery sources. For site-power from mains supply, a transformer is the correct choice; for portable battery-fed AC power, an inverter.

Every product is backed by our Fit Guarantee. If a part is incompatible with your machine, you can return it hassle-free. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will arrange collection. For other returns, email us first to obtain a Return Merchandise Number before sending. Returns are accepted within 30 days of purchase, in original packaging, on UK orders. A restocking fee may apply on returns where the buyer has changed their mind. Refunds are issued to the original payment method once the return is inspected.

Delivery time depends on the product, your destination, and availability — the estimated time for any item appears on the product page, and "Check where we deliver" confirms coverage for your postcode before you order. Next-day delivery is available on most products; the option appears at checkout when applicable. We deliver across the UK, Europe, the Middle East, and Africa. Use the country selector at checkout to confirm coverage and delivery options for your destination.

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