COMPLIANCE
Test and Tag vs RCD Testing: What's the Difference?
Test and tag and RCD testing are two different electrical safety checks that are often confused. Test and tag inspects portable appliances to confirm each item is safe to use, while RCD testing checks that your safety switches actually trip fast enough to protect people from a shock. They cover different risks, and most workplaces need both.
Published 3 June 2026
Reviewed by Fadi Raslan, licensed technician (TTT69067)
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
| Test and tag | RCD testing | |
|---|---|---|
| What it checks | Portable appliances and their cords/plugs | Safety switches on the switchboard |
| Standard | AS/NZS 3760 | AS/NZS 3760 (portable RCDs) and related requirements |
| Protects against | Faulty equipment causing shock/fire | Electricity leaking to earth through a person |
| Result | A tag on each item | A record confirming trip function and timing |
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.
Frequently Asked Questions
What is the difference between test and tag and RCD testing?
Do I need both test and tag and RCD testing?
What standard covers test and tag and RCD testing in Australia?
Can test and tag and RCD testing be done in the same visit?
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