What Is a Danger Tag and Why Does Your Sydney Electrician Use One?

What is a Danger Tag, and why does a Sydney electrician or network crew use one when isolating power? A Danger Tag is a bright yellow label marked with the bold words DANGER, DO NOT OPERATE, fitted at every isolation point so nobody switches equipment back on while someone is working on it. Endeavour Energy's Electrical Safety Rules require a Danger Tag at every high voltage, low voltage, mechanical or pneumatic isolation point before work begins, and only an authorised person can attach or remove it.

⚡ Quick Answers: Danger Tags

• What does a Danger Tag actually say? It carries the words DANGER, DO NOT OPERATE in bold, warning against operating apparatus that has been isolated for work.
• Where are Danger Tags used? At every isolation point for high voltage, low voltage, mechanical or pneumatic apparatus, from network switchgear right down to a home switchboard.
• Who is allowed to attach one? Only a person authorised to operate that particular isolation point, and the tag must go on before any work starts.
• Can I take a Danger Tag off myself? No. A tag on a low voltage isolation point can only be removed by an authorised switching officer, once the need for it no longer exists.
• What is a Personal Danger Tag? A separate tag an electrically qualified worker attaches at an isolation point they created themselves, for their own protection, removable only by that same worker or with their consent.
• Is a Warning Tag the same thing? No. A Warning Tag flags equipment that is defective or operating outside its normal function, rather than warning against operating an isolated point at all.

1. What a Danger Tag actually says and does

A Danger Tag is a purpose made label, not a handwritten note or a bit of masking tape with a warning scrawled on it. The wording is standardised: DANGER, DO NOT OPERATE, in bold lettering that is hard to miss even from across a switch room or a backyard. Its only job is to warn anyone who comes across an isolated point, a technician from another trade, a cleaner, a curious homeowner, not to touch it.

The tag does not explain the fault or the job in detail to a passer by. It simply stops the single most dangerous thing that can happen during isolated work: someone else switching the supply back on while a person is still connected to, or working near, that circuit. That one rule is the entire reason the system exists, and it is why High Demand Electrical treats it as non negotiable on every job, from a straightforward meter swap to a full switchboard upgrade.

2. Where Danger Tags get used on a real Sydney job

Section 6.19 of Endeavour Energy's Electrical Safety Rules sets out that a Danger Tag must be used at every isolation point for high voltage, low voltage, mechanical or pneumatic apparatus. In practice that covers a lot of ground across a typical Sydney work site. A network crew isolating a street transformer uses one. A Level 2 electrician isolating your main switch for an emergency make safe uses one. A technician carrying out a disconnect and reconnect so a builder, a crane operator or another trade can safely work near your supply uses one too.

You might also see a yellow Danger Tag appear during defect notice rectification, when faulty or unsafe wiring identified by the network distributor needs to be isolated and corrected before the supply can be restored. In every one of these situations the tag is doing the same job: telling anyone who sees it that the point underneath has been deliberately shut down for a reason, and that reason has not yet been resolved.

3. Who is allowed to attach one

Not just anyone on a job site can slap a Danger Tag onto an isolation point. The rules are specific: a Danger Tag must be applied by a person authorised to operate that particular isolation point, and it has to go on before the work itself begins, not partway through once someone remembers. It is fixed in place using yellow tape or another approved method so it stays clearly visible to anyone who might otherwise try to operate the apparatus.

For a low voltage application, the tag is also noted with real detail: an instruction or incident number, identification of the isolation point itself, the name of the person who attached it, their work location, and the date it went on. That level of record keeping is what turns a simple yellow label into a genuine safety control that can be traced back if anything is ever questioned.

4. Why only certain people can remove one

If anyone could pull a Danger Tag off and flick a switch back on, the whole system would be worthless. That is why removal is locked down just as tightly as attachment. A Danger Tag fitted for a low voltage application can only be removed by an authorised switching officer, and only once the need for the tag no longer exists, meaning the original work is finished, tested and genuinely safe to reenergise.

This is also the exact reason a homeowner or business owner should never try to remove a yellow tag they find on their own switchboard or meter, even if the power has been off for hours and seems like an inconvenience. The person who attached it knows exactly why it is there and what still needs to happen before it comes off. Removing it early could put a technician still working somewhere else on the same network at real risk, even if nobody is visibly working at your property at that moment.

5. Personal Danger Tags versus a network issued tag

There is a second, related category worth understanding: the Personal Danger Tag. Where a standard Danger Tag is applied under network authority for a defined job, a Personal Danger Tag is attached by an electrically qualified worker for their own individual protection, at a point of isolation they created themselves for low voltage mains or apparatus work.

The removal rule here is just as strict, but it protects the individual rather than the job as a whole. A Personal Danger Tag can only be removed by, or with the consent of, the person who attached it. It is entirely possible to find more than one Danger Tag on the same isolation point at the same time, for example a network tag and one or more personal tags from different workers, which means real care has to be taken to remove only the correct tag and never assume all tags at a point serve the same purpose.

6. How this differs from a Warning Tag

A Warning Tag looks similar at a glance but means something different. Rather than warning against operating an isolated point at all, a Warning Tag flags that a piece of equipment is defective, unserviceable, or operating outside its normal function. You might see one on a faulty switch or a component that has been identified as unsafe to use until it is repaired or replaced, as distinct from a point that has been deliberately isolated for active work.

The key takeaway for a Sydney homeowner or business is simple: whichever tag you find, yellow and bold worded, it is there to stop something unsafe from happening, and it is not yours to remove. If you are unsure which tag you are looking at or why it is there, the safest move is always to call the electrician or the network distributor rather than guess. A standby generator's own changeover isolator uses a closely related lockout principle, which our guide to generator changeover isolator lockout rules covers in more detail.

Why it's Level 2 ASP work

Isolating and tagging a point correctly, whether it is a service fuse, an overhead service main or a private power pole connection, sits squarely within accredited service provider territory. A Level 2 electrician is authorised to work on live network assets up to the point of supply, including the kind of isolation, tagging and reconnection work covered here, in a way a standard Level 1 electrician is not. Getting the isolation point right, applying the correct tag with the correct detail, and knowing exactly when it can be safely removed all come down to training and authority that genuinely matters when the supply in question is still connected to the Sydney electricity network.

This is also why High Demand Electrical treats disconnect and reconnect services, overhead service mains installation and underground service mains installation with the same discipline described in Section 6.19, regardless of how small the job looks from the street.

How High Demand Electrical helps

High Demand Electrical is a licensed local team, not a call centre, and every technician who attaches or removes a Danger Tag on one of our jobs does it exactly to the standard set out in Endeavour Energy's and Ausgrid's safety rules, with the instruction number, isolation point, name, location and date recorded every time. If you have had an emergency make safe, a defect notice rectification or a disconnect and reconnect carried out at your property and you are not sure why a yellow tag is still sitting on your meter or switchboard, our team can explain exactly what stage the job is at and when it will be cleared.

We service homes and businesses across Sydney's West, South West and Sutherland Shire, and we bring the same discipline to every job regardless of size. If you would rather have a qualified set of eyes check your switchboard, your service mains or a tag you do not recognise, our electrical safety inspection covers exactly that kind of question alongside the broader condition of your installation. If a seal rather than a tag is what you have found on your switchboard, our guide to who can break or reseal a switchboard seal explains that separate, related rule.

Danger Tag FAQs (Sydney)

Can I remove a Danger Tag from my own switchboard or meter?

No. A Danger Tag on a low voltage isolation point can only be removed by the authorised switching officer who issued it, once the underlying work is finished and safe. Removing it yourself, even on your own property, can put a technician working elsewhere on the same circuit at serious risk. See our disconnect and reconnect services for how a reconnection is actually carried out once a tag is cleared.

Why would a network crew or electrician put a tag on my property's supply?

A Danger Tag goes on whenever work requires your supply to be isolated, including an emergency make safe after storm damage, a defect notice rectification, or a planned disconnect and reconnect for another trade working nearby. The tag protects everyone on site while that work is underway.

Does Ausgrid use the same Danger Tag system as Endeavour Energy?

Ausgrid's own Electrical Safety Rules use an equivalent Danger Tag system for isolation points on its network, so the concept of a yellow tag marking an isolated point is consistent across both of Sydney's main distributors, even though the exact wording and process differs slightly between Ausgrid and Endeavour Energy.

What is the difference between a Danger Tag and a Personal Danger Tag?

A Danger Tag is applied under network or job authority to protect a whole work site, while a Personal Danger Tag is attached by an individual electrically qualified worker at a point they isolated themselves, purely for their own protection. Only that worker, or someone with their consent, can remove their personal tag, even if other tags are also present at the same point.

Who do I call if I see a Danger Tag I do not understand?

Call the electrician or company who carried out the work first, since they will know exactly what stage the job is at. For a general check of your switchboard, service mains or overall installation safety, our electrical safety inspection is the right starting point.

If you have questions about a Danger Tag on your property, need an emergency make safe, or want a full electrical safety inspection before you buy, sell or renovate, get in touch with our electrical safety inspection team or arrange disconnect and reconnect services through High Demand Electrical. Call 0402 559 777 to talk it through, and keep in mind that every job needs a proper site assessment before we can confirm scope or pricing.