Dedicated Circuits for Heavy Tools in Workshops

If you have a shed on a rural property and are contemplating the conversion of this space into a fully operational workshop, it is essential to prioritise the electrical setup.
Utilising equipment such as a MIG welder, air compressor, and table saw on the same circuit as your home may result in severe complications, including frequent breaker trips, flickering lights, and hazardous overload situations.

This detailed guide delves into the crucial aspects of establishing a well-wired workshop in the rural areas of the Mid North Coast. We will examine key topics such as dedicated circuits, sub-boards, and the benefits of utilising three-phase power for larger machinery. If your requirements are limited to basic power needs for your shed—like lighting and a few outlets—please consult our guide on Shed Wiring on Acreage for a more appropriate starting point. This article specifically addresses workshops with significant power demands.

Recognise the Significance of Dedicated Circuits for Your Workshop

Most residential properties employ multiple power points on shared circuits, which works well for low-power devices like kettles and televisions. complications arise when trying to operate a 32-amp MIG welder alongside an air compressor simultaneously. This situation can lead to serious electrical issues.

Consider the potential outcomes when connecting heavy machinery to household circuits:

• Frequent breaker trips — A welder drawing over 30 amps on a 20-amp circuit will trip the breaker instantly or, worse, cause the wiring to overheat before the breaker can react.
• Voltage drops — Extended cable runs from the main board to the shed may result in voltage sag. This can lead to your tools operating at higher temperatures, reduced speeds, and a shorter lifespan.
• Power interruptions in the house — Your partner might experience a power outage in the kitchen simply because you activated the compressor, leading to unnecessary conflicts.
• Increased fire risks — Overloaded wiring within walls and cable runs is a leading cause of electrical fires in rural areas.

Implementing dedicated circuits effectively addresses these concerns. Each heavy tool is assigned its own circuit, sized appropriately for its power needs, along with its own breaker protection. This ensures that nothing is shared and nothing is overloaded.

Evaluate the Power Consumption of Common Workshop Equipment

Before your electrician can create an effective circuit layout, it is vital to comprehend the power requirements of your equipment. Here’s a comprehensive overview of the typical power consumption for common workshop tools:

• MIG welder — Requires between 15A and 32A depending on the model, with larger 240V welders typically at the higher end. Three-phase units have different specifications (more on that later).
• Air compressor — Draws approximately 10A to 15A. The startup surge can be considerable, as compressor motors often pull 3 to 4 times their running current for a few seconds upon activation.
• Table saw — Generally consumes 10A to 15A for a quality cabinet saw. More economical contractor saws may require less power, but opting for a budget option is not advisable.
• Lathe (wood or metal) — Similar to table saws, these typically require between 10A and 15A, with metal lathes generally consuming more power.
• Dust extractor — Approximately 10A for a single-phase unit. It must run continuously while using other tools, thus it should be on its own circuit.
• Plasma cutter — Draws between 20A and 30A, similar to a welder, and also requires a dedicated circuit.

When you aggregate the power consumption, it becomes clear that a single 20-amp circuit from the house will not suffice. A fully equipped workshop can easily demand 80 to 100+ amps across all circuits when operating at full capacity, underscoring the need for strategic planning.

Select the Appropriate Circuit Breaker Size and RCD Protection for Safety

Every circuit in your workshop must be equipped with a breaker that matches the cable size and expected load. Your electrician will calculate this based on your equipment, but as a general guideline:

• 15A or 20A circuits — Suitable for general power points, dust extractors, lighting circuits, and lighter tools.
• 32A circuits — Necessary for welders, plasma cutters, and other heavy single-phase machinery.
• Three-phase breakers — Sized according to specific equipment requirements (details below).

RCD protection is essential. Under AS/NZS 3000 (the Australian Wiring Rules), all power and lighting circuits must include RCD (safety switch) protection. This requirement is mandatory and designed to guard against the high-risk nature of workshop environments.
Concrete floors, metal tools, dust, and moisture elevate the likelihood of earth faults. RCDs cut power instantly when a current leak to earth occurs, which can mean the difference between a minor shock and a serious injury.

Typically, your electrician will implement a combination of RCDs and MCBs (miniature circuit breakers), or RCBO units that integrate both functionalities. RCBOs are especially advantageous in workshops, as a fault on one circuit does not disrupt power to others, enhancing safety and reliability.

Establish a Dedicated Sub-Board for Your Workshop's Electrical Needs

Rather than running multiple individual cables back to the main switchboard, installing a dedicated sub-board in your workshop is a more efficient strategy. Here are the advantages:

• Shorter cable runs — A single heavy feed cable connects from the house (or a separate meter) to the workshop board, followed by shorter runs from the sub-board to each outlet. This arrangement minimises voltage drop and reduces cable costs.
• Easier fault diagnosis — Each circuit is clearly labelled and easily accessible in the workshop. If a breaker trips, you won’t need to return to the house to reset it, saving both time and effort.
• Future expansion — A sufficiently sized sub-board allows for additional circuits in the future, making it straightforward to incorporate new tools as your workshop evolves.
• Isolation capability — You can turn off all workshop power from a single main switch without disrupting the house's electricity, enhancing safety during maintenance.

If your house switchboard is outdated or operating at maximum capacity, an upgrade may be necessary before effectively powering the workshop sub-board. Older ceramic fuse boards may not safely handle the increased load.

A typical workshop sub-board setup includes a main switch, individual RCBOs for each circuit, a dedicated lighting circuit, and a surge protection device. We will size the incoming feed cable based on the total expected load plus a buffer for future enhancements, ensuring optimal performance and safety.

Ensure Your Workshop Has Adequate Lighting for Safety and Productivity

Sufficient lighting is critical for safety in your workshop. You must clearly see your work, especially when handling sharp blades and hot materials. Here are some vital lighting considerations:

• High-lumen LED battens — LED panels or battens provide bright, consistent illumination throughout the space. Aim for a minimum of 500 lux at bench height to ensure clear visibility.
• Dust-proof fittings — Standard lights can become obstructed by sawdust and metal shavings. Opt for IP-rated fittings that resist dust and moisture for durability and safety.
• Task lighting at workstations — While overhead lighting serves to illuminate the general area, focused lighting at the workbench, lathe, and drill press is crucial for precision work and safety.
• Separate lighting circuit — Lighting should operate on its own circuit, ensuring that you still have illumination if a power circuit trips. Being left in darkness next to a running table saw poses a considerable safety hazard.

We have extensive experience with lighting layouts in commercial environments. Our team can assist you in designing a workshop lighting plan that considerably enhances your working environment and safety.

Prepare for Efficient Ventilation and Dust Extraction Circuits

When engaging in activities such as woodworking or welding, ensuring adequate ventilation is just as important as having sufficient power. Dust extraction systems and exhaust fans require their own dedicated circuits because:

• Continuous operation — Your dust extractor must run whenever you’re cutting. It cannot share a circuit with the tool it serves, as this compromises efficiency and safety.
• Motor startup loads — Dust extraction fans and collectors experience significant startup surges, similar to compressors, which necessitate dedicated circuits.
• Interlocked switching — In an optimally designed workshop, the dust extractor can be wired to activate automatically when specific tools are powered on. This requires careful circuit design to ensure functionality.

Plan for at least one dedicated 15A circuit for dust extraction and another for general ventilation. If you’re using a cyclone-style dust collection system, it might require a 20A circuit based on motor specifications, ensuring efficiency and effectiveness in maintaining air quality.

Utilise Three-Phase Power for Improved Heavy Equipment Efficiency

When engaged in intensive metalwork or operating large compressors (5HP+) or commercial-grade woodworking machinery, single-phase power may become inadequate. Three-phase power offers numerous advantages:

• Increased power capacity — Three-phase motors are more efficient and deliver greater power without the excessive startup surges associated with single-phase motors.
• Support for larger welders and plasma cutters — Industrial MIG/TIG welders and CNC plasma tables typically function on three-phase power for optimal performance.
• Smoother operation — Three-phase motors operate more smoothly and run cooler, extending the lifespan of your tools and machinery.

Accessing three-phase power in rural areas on the Mid North Coast is contingent on availability at the street level. Some properties already have a three-phase supply, while others may require a phase converter or a new connection from Essential Energy.
For further information, please consult our guide on Do I Need Three-Phase Power on My Property?

If three-phase power is available, your workshop will require the installation of a three-phase switchboard with appropriately rated breakers and an effective earthing system to ensure safety and reliability.

Implement Surge Protection to Safeguard Your Equipment

Tools with electronic controls, variable frequency drives (VFDs), digital displays, and inverter welders are vulnerable to voltage spikes. Notably, your workshop generates surges each time a large motor starts or stops. Coupled with the voltage instabilities commonly found in rural power lines, your valuable equipment is at risk.

Installing a surge protection device (SPD) at the sub-board can intercept voltage spikes before they affect your tools. This is a cost-effective solution compared to replacing the electronic components of a $3,000 welder or a CNC controller, thereby protecting your investment.

If your property is prone to storms (which is frequent on the Mid North Coast), we suggest adding surge protection at the main switchboard to defend against lightning-induced surges that could damage your equipment.

For properties that depend on a generator for backup power, incorporating a generator changeover switch ensures seamless transitions between mains power and generator supply without risking back-feeding or harming connected equipment, providing peace of mind during power outages.

Consider Additional Features for Your Workshop Wiring

Here are several more elements to include in your workshop wiring from the outset:

• Ample power points — Install more power points and switches than you anticipate needing. Use weatherproof GPOs if the workshop is open-sided, ensuring longevity. Consider double power points at every bench and outlets at key machinery locations to enhance accessibility.
• Data and communications — If you require internet access for streaming music, operating a CNC machine, or monitoring security cameras, plan for data and TV wiring alongside the electrical setup. Running cables during the initial fit-out is significantly easier than after the walls are finished, preventing future complications.
• External lighting — Include floodlights outside the workshop to facilitate access during early mornings and late evenings, especially in rural areas lacking street lighting, enhancing safety.
• EV or equipment charging — If you’re using electric equipment (battery-powered tools, an electric vehicle, or an electric quad bike), implement a dedicated charging circuit to prevent overloads on general outlets, ensuring efficient operation of all devices.

Accurately Assess the Cost of Your Workshop Electrical Installation

Cost estimates will vary based on workshop size, the number of circuits required, and whether three-phase power is needed. As a rough guideline for the Mid North Coast:

• Basic single-phase setup (sub-board, 4–6 circuits, lighting) — Starting from $5,000, providing foundational electrical support.
• Complete dedicated sub-board (8–12 circuits, multiple heavy tool circuits, dust extraction, comprehensive lighting design) — Starting from $10,000, ensuring ample capacity for serious workshop needs.
• Three-phase workshop build (three-phase supply, dedicated board, heavy equipment circuits, complete fit-out) — Starting from $15,000+, accommodating extensive power requirements.

These figures represent starting points. Complex layouts, lengthy cable runs from the mains, or the need for upgrades from Essential Energy will increase costs. We provide transparent quotes based on your specific workshop and equipment needs—no hidden fees, ensuring you know precisely what to expect.

Essential Reminder: All Electrical Work Must Be Conducted by Licensed Professionals

This is a critical point. In New South Wales, all electrical wiring work must be performed by a licensed electrician. This includes installing new circuits, sub-boards, power points, and connecting equipment. There is no DIY exemption for electrical work, even on your own property, to ensure safety and compliance.

Hack-It Electrical Solutions holds NSW Electrical Contractor Licence #230609C. We operate throughout Bellingen, Coffs Harbour, Sawtell, Nambucca Heads, Woolgoolga, Urunga, Dorrigo, Valla Beach, and Toormina, ensuring quality service.

Engaging in unlicensed electrical work can void your insurance, create significant safety hazards, and lead to fines. If someone offers to do the work cheaply without a licence, it’s not a saving—it’s a risk that can have serious repercussions.

Find Answers to Your Frequently Asked Questions Regarding Workshop Electrical Requirements

Can I Use My Welder with a Standard Power Point?

Small stick welders (up to around 140A output) can be used with a standard 10A or 15A power point. Any larger units require a dedicated circuit. A MIG welder with a capacity of 200A or more connected to a 10-amp GPO will trip the breaker immediately—or potentially cause the wiring to overheat if the breaker is faulty. If you weld regularly, it’s essential to have a dedicated 32A circuit installed to ensure safe operation.

How Many Circuits Are Generally Required in a Workshop?

The number of circuits needed depends on your tools, but a well-equipped workshop typically requires a minimum of 8 to 12 circuits. This includes dedicated circuits for each heavy tool (welder, compressor, plasma cutter), general power point circuits, dust extraction, lighting, as well as a couple of spares for future additions. We tailor the design based on your specific equipment list, ensuring you have everything you need.

Is Three-Phase Power Necessary for a Home Workshop?

Not necessarily. Most home workshops function adequately on single-phase power with dedicated circuits. Three-phase power is only necessary if you are using commercial-grade equipment, such as large compressors (5HP+), three-phase welders, or CNC machines. Consult our comprehensive guide on Do I Need Three-Phase Power on My Property? to determine if it meets your requirements, ensuring you make an informed decision.

Can My Existing Switchboard Support a Workshop?

It’s possible. If your house switchboard is modern and has spare capacity, we can often connect a workshop sub-board to it. If it consists of an outdated ceramic fuse board or is fully loaded, an upgrade will be necessary before proceeding. We will assess this during the quoting process to ensure everything aligns with current standards.

What Is the Typical Duration for a Workshop Electrical Fit-Out?

A basic single-phase setup can usually be completed within 1 to 2 days. A full fit-out encompassing multiple heavy circuits, three-phase power, and comprehensive lighting typically takes 3 to 5 days, depending on the complexity and cable run distances. We will provide a timeline along with your quote, ensuring you know what to expect.

Ensure Your Workshop Is Properly Wired for Safety and Efficiency

If you are establishing a workshop on your property and want to ensure it is done correctly from the outset, reach out to us. We will visit your site, assess your space and equipment list, and develop a plan that meets your power requirements without compromising safety or quality, ensuring a successful workshop setup.

Contact Hack-It Electrical Solutions at 0402 079 803 or get in touch with us online to arrange a detailed quote and consultation.

We are your local electricians in Bellingen, proudly serving the entire Mid North Coast from Nambucca Heads to Woolgoolga and up to Dorrigo.