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A Plain Guide to Warning (Hazard) Signs
Yellow triangle signs alert people to a hazard before they get close to it, whether that’s live wiring or forklifts on the move.
What warning signs tell you
A yellow triangle with a black border and black symbol flags a hazard. South African catalogues often list these under WW codes in SANS 1186. The triangle points upwards, and its colour is picked so it stands out from far away.
!
General warning
An exclamation mark: a general hazard that has no specific symbol.
!
Electrical hazard
A lightning bolt: a risk of electric shock.
!
Forklift trucks
Vehicles moving through the area.
Common warning signs and where to put them
| Warning | Typical places |
|---|
| Electrical hazard / high voltage | Distribution boards, substations, transformers and generator rooms |
| Forklift trucks | Warehouses, loading bays, aisles and pedestrian crossing points |
| Slippery floor | Kitchens, wash bays, and entrances on wet days |
| Corrosive or toxic materials | Chemical stores, cleaning cupboards, labs, battery rooms |
| Flammable material | Fuel stores, paint stores and gas cylinder cages |
| Hot surface | Kitchens, boilers, pipework, presses and heat-producing machines |
| Overhead load / crane | Workshops and yards that have cranes or hoists |
| Tripping hazard / uneven floor | Steps, ramps and level changes |
| Guard dogs / electric fence | Gates, walls and perimeter fencing |
Tips for using warning signs well
- Put the sign where people spot it before they reach the hazard, not right on top of it
- Avoid crowding a wall; too many signs in one spot tend to be ignored
- Add a text panel for visitors and contractors who might not recognise the symbol
- Pair it with a mandatory sign when the hazard calls for PPE, for example “electrical hazard” plus “wear insulating gloves”
- Replace faded signs; yellow fades in direct sunlight, so choose UV-resistant material for outdoor use
Questions we are often asked
What do yellow warning signs stand for?
A yellow triangle with a black border flags a nearby hazard. It doesn’t tell you what to do; it simply reminds you to take care.
How does a warning sign differ from a prohibition sign?
A warning sign (yellow triangle) points out a danger. A prohibition sign (red circle with a bar) tells you that an action is not allowed.
Can I add my own text below a warning sign?
Yes. A supplementary text panel, such as “Danger: high voltage” or “Forklifts operating”, helps visitors understand the symbol. We print symbol-and-text combination signs to order.
Which warning signs should an electrical board have?
At minimum, an electrical hazard warning sign. Many sites also add a “Danger: authorised persons only” sign and an electrical shock first aid poster. Your electrician or safety officer can confirm.
Explore more safety sign guides
Order Your Safety Signs Now
Express Print produces SABS-style safety signs on ABS, aluminium, Chromadek, Correx and photoluminescent vinyl from Rivonia, Johannesburg. Send us the sign codes and sizes and we will give you a quote.
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