AS/NZS 3551 Explained
Last updated: October 2026
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Electrical installations and equipment on construction and demolition sites
AS/NZS 3012:2019 provides electrical safety requirements for construction and demolition sites, where electrical equipment is often exposed to significantly harsher conditions than in a normal workplace.
It is particularly relevant to MegaTest, the appliance electrical testing division of NZ Test Group, when inspecting and testing portable electrical equipment, extension leads and other equipment used on construction sites.
What Does AS/NZS 3012 Cover?
AS/NZS 3012 addresses electrical installations and electrical equipment used during construction and demolition work.
Construction environments can expose equipment to moisture, dust, impact, vibration, repeated movement and physical damage.
The standard therefore provides additional requirements intended to manage the increased electrical risks associated with these environments.
Why Are Construction Sites Treated Differently?
A power tool used every day on a building site experiences very different conditions from a computer sitting on an office desk.
Extension leads may be dragged across floors, plugs can be exposed to dirt and moisture, and portable tools can receive considerable physical wear.
Because of these conditions, electrical equipment used on construction sites generally requires more frequent inspection and testing than equipment operating in lower-risk environments.
What Electrical Equipment May Be Covered?
Depending on the site, equipment can include items such as:
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Portable power tools
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Extension leads and cord sets
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Portable lighting
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Battery chargers and power supplies
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Portable electrical equipment
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Site switchboards and distribution equipment
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RCD protection
The requirements applying to each item depend on the type of equipment and how it is being used.
How Often Should Construction Equipment Be Tested?
Electrical equipment used in construction and demolition environments is commonly subject to a three-month inspection and testing cycle.
This reflects the higher likelihood of damage and deterioration in construction environments.
The inspection and testing programme should also take account of the equipment itself, its use and the conditions encountered on the site.
Importantly, a current test tag should never be treated as a reason to continue using equipment that has become damaged or unsafe between scheduled inspections.
Is a Test Tag Enough?
No. A test tag provides a useful visual indication that an item has been inspected and tested, but it does not guarantee that the equipment will remain safe until the date shown on the tag.
Equipment can be damaged at any time.
Users should remain alert for damaged leads, cracked plugs, exposed conductors, damaged enclosures or other obvious defects and remove unsafe equipment from service.
Regular visual inspection remains an important part of electrical safety on a construction site.
What About Extension Leads?
Extension leads are particularly vulnerable on construction sites because they are frequently moved and can be exposed to impact, abrasion, moisture and other physical damage.
Inspection should consider the condition of the cable, plug, socket, cord entry points and any signs of inappropriate repairs or modifications.
Electrical testing can then be carried out as appropriate.
Damaged extension leads should be removed from service rather than simply taped up and returned to use.
What About RCDs?
Residual Current Devices (RCDs) are an important part of electrical protection on construction and demolition sites.
RCDs are designed to disconnect the electricity supply when certain electrical fault conditions occur.
However, an RCD should not be considered a substitute for maintaining electrical equipment in safe condition.
RCDs themselves also require appropriate inspection and testing to verify that they continue to operate correctly.
What Happens if Equipment Fails?
Electrical equipment that fails a visual inspection or electrical safety test should be clearly identified and removed from service.
It should not be returned to use until it has been appropriately repaired and reassessed, or replaced or disposed of.
Simply attaching another test tag does not make damaged equipment safe.
Does AS/NZS 3760 Still Apply?
AS/NZS 3760 provides the general framework for the in-service safety inspection and testing of electrical equipment and RCDs.
AS/NZS 3012 provides additional requirements specifically associated with construction and demolition sites.
This distinction is important because the environment in which equipment is used can affect both the risks involved and the inspection and testing regime that applies.
What About Equipment Brought Onto the Site?
Businesses should consider the electrical safety of equipment being brought onto a construction site, including equipment supplied by contractors and subcontractors.
Site procedures may require equipment to be appropriately inspected and tested before it is used.
A tag can provide a quick visual indication of an item's testing status, while good equipment records provide a more complete history of the inspection and testing undertaken.
Where Does AS/NZS 3012 Fit With Other Standards?
AS/NZS 3012 deals specifically with electrical safety on construction and demolition sites.
AS/NZS 3760 provides the broader framework for in-service inspection and testing of electrical equipment and RCDs, while other electrical installation standards and regulatory requirements may also apply.
Understanding the environment in which equipment is being used is important when determining the appropriate inspection and testing requirements.
Need Help With AS/NZS 3012?
MegaTest – Appliance Electrical Testing
MegaTest provides electrical equipment inspection and testing for construction sites and other workplaces as part of NZ Test Group.
If you're unsure what inspection or testing requirements apply to electrical equipment on your construction site, talk to our team.