What test and tag does
Test and tag, carried out under AS/NZS 3760, focuses on portable, plug-in equipment — anything with a flexible cord. A technician visually inspects each item, runs electrical tests (such as earth continuity and insulation resistance), and fits a tag showing the test date, retest date, and result.
The goal is to catch a damaged cord, faulty plug, or failing appliance before it can cause a shock or fire.
What RCD testing does
An RCD (residual current device), commonly called a safety switch, is the device on your switchboard that cuts power in a fraction of a second when it detects electricity leaking to earth — for example, through a person.
RCD testing verifies two things: that the switch trips when it should (the push-button test), and that it trips fast enough to actually protect someone (the trip-time test, measured in milliseconds). An RCD can look fine but be too slow or stuck — testing is the only way to know it will work in an emergency.
How they compare
Why you usually need both
The two checks protect against different failure points. Test and tag makes sure the equipment itself is sound; RCD testing makes sure that if something does go wrong, the safety switch cuts power in time. One without the other leaves a gap.
That's why a complete workplace electrical-safety program typically includes both, often carried out in the same visit.
Not sure where you stand? If you're not sure whether your workplace has current records for both, a single site visit can check your appliances and your safety switches together. Read more in our RCD testing guide and our complete test and tag guide.
Need both test and tag and RCD testing?
We include RCD testing as part of every electrical test and tag service. One visit, one provider, one set of compliance records. Same-day certificates.
Note: This article is general information. Confirm your specific compliance requirements with a qualified professional.