Dedicated Circuits for Heavy Tools in Workshops

As a shed owner on a rural property contemplating the transformation into a fully functional workshop, it is crucial to prioritise the electrical system.
Operating equipment like a MIG welder, air compressor, and table saw on the same circuit as your home can lead to significant problems, including tripped breakers, flickering lights, and even dangerous overload situations.

This in-depth guide delves into the vital components necessary for wiring a robust workshop in the rural areas of the Mid North Coast. We will cover essential subjects such as dedicated circuits, sub-boards, and the use of three-phase power for larger machinery. If your requirements are limited to basic power for your shed—like lighting and a few outlets—please refer to our guide on Shed Wiring on Acreage for a better starting point. This article specifically addresses workshops that demand substantial power.

Recognise the Significance of Dedicated Circuits in Your Workshop

Most residential properties utilise 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 scenario can lead to serious electrical issues.

Think about the possible repercussions of connecting heavy machinery to household circuits:

• Frequent tripped breakers — A welder drawing over 30 amps on a 20-amp circuit will immediately trip the breaker or, worse, cause the wiring to overheat before the breaker can react.
• Voltage drops — Extended cable runs from the main board to the shed can lead to voltage sag, which causes your tools to operate at higher temperatures, slower speeds, and ultimately reduces their lifespan.
• Power disruptions in the house — Your partner may suddenly find themselves in darkness in the kitchen because you turned on the compressor, often resulting in unwanted discussions.
• Increased fire hazards — Overloaded wiring within walls and cable runs is a leading cause of electrical fires in rural areas.

Implementing dedicated circuits resolves these issues effectively. Each heavy tool receives its own circuit, correctly sized for its load, along with its own breaker protection. This setup ensures nothing is shared, and nothing becomes overloaded.

Evaluate the Power Requirements of Common Workshop Equipment

Before your electrician can create an appropriate circuit layout, understanding the power requirements of your tools is essential. Here’s a detailed overview of typical power draws for common workshop equipment:

• MIG welder — Requires between 15A and 32A depending on the model. Larger 240V welders typically fall at the higher end. Three-phase units have varying requirements (more on that later).
• Air compressor — Draws around 10A to 15A. The startup surge can be substantial—compressor motors often pull 3 to 4 times their running current for a few seconds during startup.
• Table saw — Generally consumes 10A to 15A for a quality cabinet saw. Budget contractor saws might require less power, but you likely seek a higher-quality option.
• Lathe (wood or metal) — Similar to table saws, these typically require between 10A and 15A, with metal lathes usually on the higher side.
• Dust extractor — Approximately 10A for a single-phase unit. It must run continuously while other tools operate, so it should be on its own circuit.
• Plasma cutter — Draws between 20A and 30A, similar to a welder, and requires a dedicated circuit.

When you add up the total power draw, it becomes clear that a single 20-amp circuit from the house is insufficient. A well-equipped workshop can easily demand 80 to 100+ amps across all circuits when running at full capacity, emphasising the need for strategic planning.

Select the Right Circuit Breaker Size and RCD Protection for Safety

Every circuit in your workshop must have 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 vital. In accordance with AS/NZS 3000 (the Australian Wiring Rules), all power and lighting circuits must have RCD (safety switch) protection. This is a legal requirement designed to safeguard against the high-risk nature of workshop environments.
Concrete floors, metal tools, dust, and moisture raise the likelihood of earth faults. RCDs instantly disconnect power if a current leak to earth occurs, which can make the difference between a minor shock and a serious injury.

Typically, your electrician will combine RCDs with MCBs (miniature circuit breakers) or use RCBO units that integrate both functionalities. RCBOs are particularly advantageous in workshops because a fault on one circuit does not cut off power to others, enhancing safety and reliability.

Install a Dedicated Sub-Board to Meet Your Workshop’s Electrical Demands

Rather than running multiple individual cables back to the main switchboard, setting up a dedicated sub-board in your workshop proves to be a more efficient solution. Here are the benefits:

• 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 reduces voltage drop and lowers cable costs.
• Simplified fault diagnosis — Each circuit is clearly labelled and easily accessible in the workshop. If a breaker trips, you won’t need to walk back to the house to reset it, saving time and effort.
• Future expansion — An adequately sized sub-board allows for additional circuits down the line, making it easy to add 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 full capacity, you may need an upgrade before effectively powering the workshop sub-board. Older ceramic fuse boards may not safely accommodate 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 anticipated load plus a buffer for future additions, ensuring optimal performance and safety.

Ensure Your Workshop Is Well-Lit for Safety and Productivity

Proper lighting is essential for safety in your workshop. You need to see your work clearly, especially around sharp blades and hot materials. Here are some crucial lighting considerations:

• High-lumen LED battens — LED panels or battens provide bright, even lighting throughout the space. Aim for a minimum of 500 lux at bench height to ensure visibility.
• Dust-proof fittings — Regular lights can get clogged with 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 covers the general area, focused lighting at the workbench, lathe, and drill press is vital for precision work and safety.
• Separate lighting circuit — Lighting should operate on its own circuit, ensuring you still have light if a power circuit trips. Being left in darkness next to a running table saw poses a significant safety risk.

We have extensive experience with lighting designs in commercial spaces. Our team can assist you in creating a workshop lighting plan that significantly enhances your working environment and safety.

Plan for Effective Ventilation and Dust Extraction Circuits

When engaging in activities such as woodworking or welding, ensuring proper ventilation is as critical as having sufficient power. Dust extraction systems and exhaust fans should have their own dedicated circuits due to the following reasons:

• Continuous operation — Your dust extractor must run whenever you’re cutting. It cannot share a circuit with the tool it serves, as this compromises both efficiency and safety.
• Motor startup loads — Dust extraction fans and collectors experience considerable startup surges, similar to compressors, requiring 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 need a 20A circuit based on motor specifications to maintain efficiency and effectiveness in air quality management.

Utilise Three-Phase Power for Enhanced Performance of Heavy Equipment

When delving into intensive metalwork or operating large compressors (5HP+) or commercial-grade woodworking machinery, single-phase power may have its limitations. Three-phase power offers numerous advantages:

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

Accessing three-phase power in rural areas on the Mid North Coast relies on its availability at the street level. Some properties may already have a three-phase supply, while others might need a phase converter or a new connection from Essential Energy.
For more details, 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 a reliable earthing system to ensure safety and dependability.

Establish Surge Protection to Safeguard Your Equipment

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

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

If your property is susceptible to storms (which is common in the Mid North Coast), we recommend adding surge protection at the main switchboard to shield against lightning-induced surges that could damage your equipment.

For properties relying on a generator for backup power, incorporating a generator changeover switch guarantees smooth transitions between mains power and generator supply without risking back-feeding or damaging connected equipment, providing peace of mind during power outages.

Consider Additional Features for Your Workshop Electrical Installation

Here are a few more aspects to include in your workshop wiring from the beginning:

• Ample power points — Install more power points and switches than you believe you’ll need. Use weatherproof GPOs if the workshop is open-sided to ensure durability. Consider double power points at every bench and outlets at key machinery locations to improve accessibility.
• Data and communications — If you need internet access for streaming music, operating a CNC machine, or monitoring security cameras, plan for data and TV wiring concurrently with the electrical setup. Running cables during the initial fit-out is far easier than after the walls are finished, avoiding future complications.
• External lighting — Incorporate 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 Costs 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 installation) — Starting from $15,000+, accommodating extensive power requirements.

These figures represent starting points. Complex layouts, lengthy cable runs from the mains, or the necessity 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 exactly what to expect.

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

This is a crucial 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.

Frequently Asked Questions About Workshop Electrical Requirements

Can I Use My Welder with a Standard Power Point?

Small stick welders (up to approximately 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 Typically Needed for a Workshop?

The number of circuits required depends on your tools, but a well-equipped workshop generally needs 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 customise 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 operate satisfactorily on single-phase power with dedicated circuits. Three-phase power is only required if you are using commercial-grade equipment, such as large compressors (5HP+), three-phase welders, or CNC machines. Check out our complete guide on Do I Need Three-Phase Power on My Property? to determine if it suits your requirements, ensuring you make an informed decision.

Can My Existing Switchboard Support a Workshop?

It’s possible. If your home 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 evaluate this during the quoting process to ensure everything complies with regulations.

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 beginning, contact 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 reach out to 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.