Where three phase testing applies
Anything drawing three phase power: welders, compressors, industrial ovens and dishwashers, commercial kitchen equipment, workshop machinery, pumps, and the extension leads and distribution boxes that feed them. On construction sites the leads and distro boxes often take more damage than the plant itself, so they carry the shorter retest interval.
How we test it
Three phase items are tested for earth continuity, insulation resistance and correct phase rotation using equipment rated for the load. Distribution boxes are checked including any built-in RCD protection, which is tested separately for trip time. Long site leads are tested at full length rather than coiled, because a fault in the middle of a 30 metre lead will not show up any other way.
Where a three phase item is hard-wired rather than plugged in, it falls outside AS/NZS 3760 and needs to be handled as fixed wiring by a registered electrician. We will tell you clearly which of your assets fall on which side of that line.
Typical interval: 3 – 12 months. We confirm the right frequency for your site when we quote.
Get moving
Ask about three phase testing
Tell us roughly how many items you have and where. We come back with a fixed quote, usually the same day.
Or email
info@mastertestandtag.co.nz
Common questions
About three phase testing
How often should three phase equipment be tested?
The same environmental rule applies as for single phase. Construction and demolition sites are three months. Workshops, factories and commercial kitchens are typically six to twelve months. Site leads and distribution boxes usually sit at the shorter end because of the handling they get.
Can you test equipment that is hard-wired?
Hard-wired equipment is fixed wiring, not a portable appliance, so it sits outside AS/NZS 3760 and requires a registered electrician. We identify hard-wired items during the walkthrough and list them separately on your report so nothing is assumed to be covered when it is not.
Also available
Other services
Appliance Test and Tag
Visual inspection plus electrical testing of every portable appliance, tagged and logged to AS/NZS 3760:2022.
Read more →
RCD Testing
Push-button and trip-time testing of residual current devices, portable and fixed.
Read more →
Lead and Plug Repairs
On-the-spot repair of failed leads, plug tops and sockets, plus custom-made braided extension leads.
Read more →
Exit and Emergency Lighting
Six-monthly testing of emergency and exit lighting to AS/NZS 2293.2, including the 90 minute discharge test.
Read more →
Microwave Leakage Testing
Annual microwave radiation leakage testing to AS/NZS 60335.2.25:2020, with a recorded leakage figure.
Read more →Find out what compliance actually costs.
Send us an item count and we will come back with a fixed quote — usually the same day.