Site Power Systems for Floor Preparation & Industry

Site Power Transformation

240V to 110V Site Transformers

A 110V site transformer converts standard UK mains supply (240V single phase) to the recognised safer 110V system used across construction environments.

In surface preparation applications, transformers are often subjected to sustained load rather than intermittent tool use. Correct capacity selection should consider runtime and equipment demand.

• 3kVA units are typically suited to 16A handheld tools and intermittent edging.
• 5kVA units are commonly selected for 32A grinders and industrial dust extractors where extended operation is expected.
• Higher-capacity units (10kVA+) are available where greater distribution capacity or multiple outlets are required.

Selecting a transformer with suitable operating margin supports thermal stability during prolonged grinding.

400V to 110V Transformers

Where site supply is derived from a three-phase distribution panel, 400V to 110V transformers provide stepped-down output for 110V equipment.

These are typically specified for:

• Industrial facilities
• Panel-fed supply arrangements
• Multi-tool distribution setups
• Extended daily runtime environments
• Configuration is project-dependent and available on request.

Professional Extension Leads

Cable specification differs significantly between 110V, 240V, and 400V systems. Correct selection supports voltage stability, safe current handling, and reduced thermal stress.

110V Single Phase Leads

110V systems operate at lower voltage and therefore higher current for equivalent power output. Cable size and total run length directly influence performance.

For 32A 110V machinery:

• 4.0mm² – Typically supplied in 14m configurations and suited to shorter 32A runs.
• 6.0mm² – Commonly selected for 20–25m 32A grinder and extractor setups.
• 10.0mm² – Used for extended runs where additional operating margin is required. Larger cores may require compatible glands, as not all 32A connectors will accept increased cable diameter.

Custom lengths are available.

Correct specification is particularly important on 110V systems due to higher current demand.

240V Single Phase Leads

240V systems operate at higher voltage and therefore lower current compared to 110V systems for equivalent power.

Typical configurations include:

• 2.5mm² – Suitable for most 13A applications.
• 4.0mm² – Used for higher-load or moderate-distance setups.
• 6.0mm² – Specified where sustained load or extended cable runs are expected.

While voltage drop is generally less severe than on 110V systems, correct cable sizing remains important for industrial machinery.

400V Three-Phase Leads

Specified for planetary grinders, industrial extraction systems, and heavy-duty machinery.

Available in:

• 16A
• 32A
• 63A

Core types include:

• H07RN-F rubber
• SY (steel wire braid shielded) for additional mechanical protection in abrasive environments

All three-phase leads are verified prior to dispatch for:

• Correct phase rotation
• Earth continuity
• Terminal integrity

Phase-rotation plug configurations can be supplied where site flexibility is required.

Splitters, Reducers & Adaptation

Controlled distribution solutions are available for professional site setups.

Examples include:

• 32A to 16A reducers (110V and 400V)
• 32A to 2 × 16A splitters
• 63A to 32A reducers
• Custom distribution assemblies built to specification

Correct rating selection is essential to maintain circuit protection integrity and safe load distribution.

Power Monitoring & Automation

Power conversion does not regulate unstable incoming supply.

PWM supplies:

• Inline power meters – 110V, 240V & 400V
• Real-time voltage monitoring
• Current observation under load
• Plug-and-play connection
• Supply condition testers
• Earth continuity verification
• Polarity confirmation (single phase)
• Auto stop/start switches (16A & 32A)
• Synchronise extraction systems with grinders
• Reduce idle runtime
• Support controlled dust management

Monitoring supply before sustained operation reduces risk to high-value machinery.

Cable Selection – Surface Preparation Reference Guide

Cable specification should consider:

• Supply voltage
• Plug rating
• Cable length
• Expected runtime
• Installation environment

Typical Surface Preparation Setups

Voltage	Plug Rating	Typical Run	Common Selection
110V	16A	Short–moderate	2.5mm² – 4.0mm²
110V	32A	Up to 14m	4.0mm²
110V	32A	20–25m	6.0mm²
110V	32A	Extended	10.0mm²
240V	13A	Standard	2.5mm²
240V	16–32A	Moderate	4.0mm² – 6.0mm²
400V	16A	Industrial	2.5mm² – 4.0mm²
400V	32A	Industrial	4.0mm² – 6.0mm²
400V	63A	Heavy Industrial	10.0mm²+ (project dependent)

This table provides practical guidance only. Final specification should reflect machine load and duty cycle.

Inspection & Testing

All cables, leads, splitters, and distribution assemblies built by PWM are electrically tested prior to dispatch.

PAT testing services are available for customer-owned equipment where site compliance requires periodic inspection.

Site Power Best Practice

• Use one transformer per 13A wall outlet.
• Avoid operating multiple high-load transformers from a single double socket.
• Fully uncoil extension leads during operation.
• Keep connectors free from concrete dust.
• Inspect plug pins for discolouration or pitting.
• Confirm secure terminations periodically.

Reliable site power depends on correct specification and connection integrity.

Why Choose PWM?

We specialise in power systems for surface preparation and industrial site work.

Our guidance reflects practical experience with high-demand machinery operating under sustained load.

If you are unsure which configuration is appropriate, provide:

• Tool type and plug rating (16A / 32A / 63A)
• Available supply voltage (240V or 400V)
• Required cable length
• Expected runtime

We will advise accordingly.