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Find the best recessed sub board distribution enclosures here at Sparky Direct [ Read More ]
A recessed sub-board is a secondary distribution point in an electrical installation. The enclosure sits inside the wall, with its front cover finishing flush against the plasterboard or masonry surface. Inside the enclosure, DIN rails carry the protective devices that feed individual circuits.
The enclosure itself is a metal or plastic box with a hinged door, mounting holes for DIN rail, and knockouts or gland plates for cable entry. It does not include the protective devices: those are bought separately and clipped onto the rails during fit-out. This modular approach gives the electrician complete control over the circuit configuration.
The main switchboard at the meter point feeds sub-mains to one or more sub-boards positioned closer to the loads they serve. A garage, workshop, granny flat, or commercial floor each benefits from its own sub-board. This shortens final circuit cable runs, simplifies fault isolation, and reduces voltage drop on long runs.
Recessed sub-boards are sized by the number of DIN modules (also called "ways" or "poles") they hold. Common sizes range from 4 modules in a small utility cabinet up to 36 modules or more in a multi-row commercial board.
Single-door units suit residential and light commercial use. Double-door designs add a separate locking compartment for the main switch, which is useful where landlord and tenant access need to be split, or where regulatory sealing of the supply side is required.
Most modern enclosures use a 35mm symmetric DIN rail to AS/NZS IEC 60715. This is the standard mount for MCBs, RCDs, RCBOs, contactors, surge protection devices, and timers. Multi-row boards (1, 2, or 3 rows of DIN rail) let you organise circuits by group: lighting, GPOs, fixed appliances, and dedicated loads each get their own row.
Module count is the headline figure. A single-pole MCB takes 1 module. A single-pole RCBO takes 1 to 2 modules, depending on the brand. A 4-pole main switch or 3-phase RCD takes 4 modules. Allow at least 25 percent spare capacity at first fit. Future PV inverters, EV chargers, heat pumps, and battery isolation each add modules and are easier to accommodate when the board has slack.
Powder-coated steel enclosures resist mechanical impact, support heavy busbar assemblies, and tolerate higher fault currents during a short circuit event. Metal is the typical choice for industrial sub boards, plant rooms, and any location where the enclosure may take physical knocks.
Engineering-grade ABS or polycarbonate enclosures dominate the residential market. They are lighter, easier to fit, non-conductive (which simplifies earthing decisions), and cost less than metal equivalents. The MAX9 and similar modern systems use insulated plastic housings combined with internal metal busbars and chassis.
| Property | Steel (powder-coated) | ABS / Polycarbonate |
|---|---|---|
| Mechanical impact | High resistance | Moderate resistance |
| Weight | Heavy | Light |
| Corrosion (indoor) | Coating dependent | Inert |
| Typical use | Commercial, industrial | Residential, light commercial |
| Cost | Higher | Lower |
The IP rating describes ingress protection. The first digit (0 to 6) covers solids and dust. The second digit (0 to 8) covers water. A typical indoor recessed sub board sits at IP30 or IP40: dust-resistant and protected against small tools, but not water. Outdoor or weatherproof boards step up to IP54, IP65, or IP66.
Recessed sub-boards are designed for interior wall installation. The wall itself provides the weather barrier, so the enclosure only needs to handle the internal environment. Where a sub-board must sit in a garage door alcove, carport, or external wall, a higher IP rating or a fully weatherproof distribution board is required.
Coastal salt air, laundry rooms, pool plant rooms, and unsealed garages create a corrosive atmosphere. Specify a higher IP rating, choose plastic over metal where practical, and seal cable entries with proper cable glands rather than leaving knockouts open.
For high-end residential and commercial fit-outs, the enclosure becomes part of the wall rather than an object on it. With paint-grade trim, the door can be styled to match adjacent finishes.
Open-plan layouts and narrow corridors leave little room for surface-mounted boards. Recessing the enclosure into the cavity recovers that wall depth for furniture, doorways, or built-in joinery.
A flush-mounted door is harder to catch with a vacuum, ladder, or trolley. In garage and storage installations, this matters. Combined with a lockable cover, the board becomes child-resistant and harder to tamper with.
The wall has to be opened up, framed if needed, and made good after fit. On a renovation, that means timing the rough-in around plasterboard work and managing dust. New builds make this easier because the cavity is open during first fix.
Standard timber stud walls give around 90mm of cavity depth. Most residential recessed boards are designed to fit, but deeper multi-row enclosures can foul the back lining or, in older homes, the back of an external wall. Always check the manufacturer's depth specification before cutting.
Cables enter through knockouts in the top, sides, or bottom of the box. A recessed board limits where you can drill: side entries that work fine on a surface-mount board may be blocked by studs or noggins. The top and bottom entry into the cavity is usually the cleanest path.
Three protective device types share the DIN rail:
Insulated busbars distribute the active phase across the line of breakers, replacing the loose looping wire arrangements of older boards. Neutral links provide the common return for each circuit, and a separate earth bar terminates all circuit earth conductors. Quality enclosures pre-fit these accessories or supply them in the kit.
A surge protection device on the incoming side protects sensitive electronics against transient overvoltage from lightning and switching events. Smart modules such as load monitors, energy meters, and automation controllers also clip onto DIN rail. Allow space for these at first fit.
Start with a circuit count. List every final subcircuit the board will feed: lighting circuits, GPO rings, fixed appliances, hot water, air conditioning, oven, cooktop, EV charger, and any dedicated loads. Add the main switch and any incoming RCD. The total module count drives the enclosure size.
Aim for 25 to 30 percent unused modules at first fit. Solar inverters, batteries, EV charging, heat pump hot water, and pool equipment are all common retrofits that need a free DIN slot. Stretching to a slightly larger enclosure now is much cheaper than swapping the box later.
Check three measurements: external trim size (visible on the wall), internal box dimensions (drives the wall opening), and depth (must clear the back of the cavity). For two-row and three-row boards, also confirm DIN rail spacing accommodates the height of any over-sized devices like 4-pole main switches.
| Aspect | Recessed | Surface Mount |
|---|---|---|
| Wall finish | Flush, integrated | Projects from wall |
| Wall cavity required | Yes | No |
| Install complexity | Higher | Lower |
| Best application | New builds, renovations with open walls | Garages, sheds, retrofits, plant rooms |
| Cable entry options | Top and bottom typical | Any side |
Choose recessed when the wall is open during construction, when aesthetics matter, when wall depth allows, and when the board sits in a finished living or commercial space. The integrated finish justifies the extra fit-out work.
New builds are the natural home for recessed enclosures: framing, services, and plaster all happen in sequence. Renovations are workable when plasterboard is already coming off, but if walls are staying intact, a surface-mounted board is the more practical choice.
Licensed work only: Installation, alteration, or replacement of a sub board is licensed electrical work in every Australian state and territory. The job must be carried out by a licensed electrician and tested before energising.
The AS/NZS 3000 Wiring Rules govern circuit protection, RCD requirements, segregation of circuits, accessibility of switchgear, and labelling. Sub boards must be readily accessible, clearly labelled with circuit identification, and protected by upstream main switches and circuit protection on the sub mains feed.
AS/NZS 61439 defines the construction, testing, and verification requirements for low-voltage switchgear and controlgear assemblies. Recessed sub boards intended for compliant installation should be supplied as type-tested or design-verified assemblies, with manufacturer documentation referencing the standard.
On completion, the electrician issues a Certificate of Compliance (or Certificate of Electrical Safety, depending on the state) and lodges it with the relevant regulator. Insulation resistance, earth continuity, RCD trip time, and polarity are all tested before energising.
Timber stud walls are the easiest to recess into: cut between studs, add noggins above and below if needed, and frame the opening to suit. Masonry and concrete walls require chasing or coring, which is slower and noisier, but feasible with the right tools. Confirm the wall is non-load-bearing or that the opening will not compromise structural capacity.
The sub mains feed must be sized for maximum demand calculated under AS/NZS 3000, with allowance for diversity and voltage drop. Common residential sub mains use 6mm or 10mm building wire; larger commercial loads step up to 16mm, 25mm, or higher. Cable sizing also drives the rating of the upstream main switch and any sub mains protection.
AS/NZS 3000 requires switchgear to be readily accessible. Mount the board so the highest operating handle is no more than 2 metres above the standing surface, with adequate clearance in front of the door for safe operation. Avoid positioning above sinks, cooktops, or wet areas, and keep clear of stored combustibles.
Sparky Direct stocks recessed enclosures from Clipsal, Hager, Legrand, and NLS, alongside the breakers, RCBOs, and busbars to fit them out. Trade pricing applies to qualifying accounts.
The price gap between an unbranded enclosure and a trade-grade unit is small once you factor in fit-out time, busbar quality, and fault-rating compliance. Recognised brands publish AS/NZS 61439 verification, supply pre-fitted neutral and earth bars, and offer modular accessories that swap in cleanly during future upgrades.
Recessed installation usually costs more than surface mounting. The price gap covers wall cutting, framing, and patching plaster after fit. On new builds where the wall is already open, the cost difference narrows considerably.
A correctly sized, well-built recessed sub board lasts the life of the building envelope. The internal devices, including single pole circuit breakers and RCBOs, may be replaced or upgraded over time. The enclosure stays in the wall.
Two decisions today save money later: oversizing the enclosure for spare modules, and selecting a manufacturer whose accessory range will still be supplied in 10 to 15 years. Major brands keep backwards-compatible busbar and breaker formats across product generations.
Periodic inspection covers RCD trip-test (the test button), visual inspection of terminations for discoloration or arcing, and torque checks on accessible terminals. AS/NZS 3760 covers in-service safety inspection in workplaces. Residential RCDs benefit from a quarterly test-button check.
Every circuit must be clearly labelled. A circuit schedule inside the door records circuit number, description, breaker rating, and cable size. The sub board itself should be labelled with its supply origin and the location of the upstream isolating device.
The main causes of long-term failure are heat (loose terminations creating resistive joints), corrosion (where IP rating is inadequate), and obsolete protection (older single-RCD boards retrofitted with RCBOs). Periodic thermographic inspection picks up heating issues before they cause fire damage.
If the door does not sit flush, check the cavity depth against the manufacturer's spec, confirm there is no obstruction behind the box, and verify the framing is square. Adding a packer behind the trim is a last resort: ideally the box sits cleanly without it.
Cable entry constrained by studs or noggins is common in retrofit work. Using a side-entry box or routing cables through the floor or ceiling cavity rather than directly through the wall often resolves the issue. Maintain the manufacturer's bend radius and protect cables where they pass through metalwork.
The frequent reasons a sub board fails inspection: missing or illegible labelling, RCDs not protecting all required final subcircuits, undersized earthing, accessible live parts behind a removed cover, and main switch ratings inconsistent with sub mains protection. All are addressed at the design stage rather than the test stage.
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It’s well built and recessed, making it perfectly suited to a garage setup. Very happy with Clipsal products in general and this has not let me down.
Excellent service. Easy to order. Competitive pricing. Great communication and superfast delivery. A+++
Nice that the Bus bars can moved to the lower position foe cable entry from below.
Quality products in stock • Fast Australia-wide delivery • Competitive trade pricing
Browse Recessed Enclosures → Get Expert Advice →Yes, they are a standard choice for new builds and flush-mounted installations.
Sparky Direct supplies recessed enclosures Australia-wide, offering flush-mounted electrical housing solutions with convenient delivery.
Recessed enclosures are securely packaged and delivered via standard courier services.
Unused products are generally eligible for return according to the seller’s returns policy.
Warranty coverage varies by manufacturer and typically covers defects in materials or workmanship.
Yes, recessed enclosures are typically sold as individual units.
Yes, correct depth selection ensures adequate space for wiring and components.
Quality recessed enclosures are designed to withstand everyday use once installed.
Yes, they help contain and organise wiring neatly within the wall.
Yes, they can be installed during renovations where wall access is available.
Yes, they are commonly specified in new residential builds.
Only the front cover or faceplate is visible once installed.
Yes, they are commonly installed in plasterboard and cavity walls.
Recessed enclosures are electrical housings designed to be installed within a wall cavity so the enclosure sits flush with the wall surface.
Yes, they offer a tidy and modern appearance compared to surface-mounted options.
They provide a flush, low-profile finish that blends neatly into walls.
Yes, they protect wiring and devices from accidental contact and damage.
Yes, they are primarily designed for indoor installations within wall cavities.
Yes, they are suitable for commercial and light industrial installations.
Yes, they are widely used in residential electrical projects.
Yes, they are available in a range of sizes to suit different electrical components and wiring requirements.
They are commonly made from durable plastic or metal depending on the application and environment.
Yes, they are designed to safely contain electrical wiring and devices within wall cavities.
Quality recessed enclosures are manufactured to meet relevant AS/NZS electrical and safety standards when installed correctly.
They are used to house electrical connections, outlets, switches, control equipment, or communication components in a flush-mounted format.
