Do Not Operate Signs tell staff and contractors that machinery, controls or equipment must not be used. They help you protect people during maintenance, isolation, fault reporting and inspection work by making the restriction clear before someone reaches the switch, handle or control point.

Best places to fit Do Not Operate safety signs

You should install these signs beside machine controls, isolation points, workshop equipment, plant rooms and access doors where someone may try to start, reset or use equipment before it is safe. Keep the sign at eye level and close to the action being stopped.

Viewing distance guidance for Do Not Operate Signs

Choose the larger size when the message must be read from across a workshop or plant area. Use the smaller option for close-range control points, switches and cabinet doors where people normally stand within a few metres.

Size option	Best viewing use	Practical distance
H 100 x W 250 mm	Close control points, small machines and doors	Approx. 1–3 metres / 3–10 feet
H 300 x W 500 mm	Workshops, plant rooms and wider equipment areas	Approx. 3–8 metres / 10–26 feet

What should improve once Do Not Operate Signs are fitted?

Once fitted in the right position, these signs help change behaviour at the exact point of risk. Staff are less likely to restart equipment, contractors get clearer handover guidance and supervisors can show a visible restriction is in place.

✅ Helps reduce accidental machine start-up during checks

✅ Gives contractors a clear instruction before use

✅ Supports safer isolation, fault and inspection control

Technical specification details for Do Not Operate Signs

Sign message: Do not operate
Purpose: prohibits use of unsafe equipment
Sign type: prohibition safety sign
Pictogram: red prohibition symbol
EN ISO 7010 code: P001 general prohibition
Conforms to EN ISO 7010 format
Conforms to BS 5499 safety sign principles

Materials: rigid plastic, self-adhesive vinyl or removable repositionable vinyl
Size options: H 300 x W 500 mm and H 100 x W 250 mm
Background colour: red and white
Text colour: white
Symbol colour: red
Shape: rectangular landscape sign
Finish: glossy film surface

Non-photoluminescent finish
Non-reflective surface
Supplied as single signs
Material thickness: varies by material selected
Fitting: wall, door or machine mounting
Vinyl options include adhesive backing
Display use: indoor and outdoor areas

ⓘ Installation Guidance

Fitting advice that makes Do Not Operate Signs harder to miss

❌ Placement errors to avoid
❌ Do not fit the sign away from the control it relates to
❌ Do not place it behind stored materials or open doors
❌ Do not rely on a small sign for a wide workshop space

❌ When this sign is not enough
❌ Do not use it as a substitute for lock-off procedures
❌ Do not use it alone where live electrical risk remains
❌ Do not leave it displayed after equipment is safe to use

✅ Better fitting choices
✅ Fit the sign before the user reaches the switch or handle
✅ Choose adhesive vinyl only on clean, smooth surfaces
✅ Use the larger size where approach distance is longer

? Customers Questions

Do Not Operate Signs questions answered

What are Do Not Operate Signs used for? They are used to stop people using machinery, plant, controls or equipment that must remain out of use because of maintenance, isolation, inspection or a known fault.

Where should I place a Do Not Operate sign? Place it where the decision happens, such as beside the start button, control handle, machine guard, switchgear, door or access point.

Which material should I choose? Use rigid plastic for longer-term wall or machine fixing, self-adhesive vinyl for smooth clean surfaces and removable repositionable vinyl where the restriction may move between locations.

Is this sign suitable for maintenance work? Yes, it is useful during maintenance, servicing and inspection, but it should support your lock-off, permit or isolation procedure rather than replace it.

Does the red prohibition symbol have a recognised meaning? Yes, the red circle and diagonal bar show that an action is prohibited, helping people understand that the equipment must not be operated.

✔ Features & Benefits

Do Not Operate Signs features and workplace benefits

Features

✓ Clear “Do not operate” wording for fast recognition
✓ Red prohibition symbol supports recognised safety meaning
✓ Landscape format suits machinery and control locations
✓ Choice of rigid plastic, adhesive vinyl or repositionable vinyl

Benefits

✓ Helps stop equipment being used before it is safe
✓ Gives you clearer control during maintenance or faults
✓ Reduces hesitation for staff, visitors and contractors
✓ Lets you match the fixing method to the surface

Alternative do not operate safety signs

For a portrait version, compare portrait do not operate not allowed signs where vertical wall space works better. Useful on machinery doors, posts and narrow fixing areas.

Where only trained staff should use the equipment, add equipment use restricted to qualified operators signs. Helps control specialist machinery and reduce misuse.

If technical competence is required, choose technically qualified operator restriction signs for a more specific instruction. Suitable for engineering plant and complex workplace equipment.

For switch-specific risks, use do not switch on machinery control signs beside isolators and start buttons. Good for preventing unintended restart during checks.

For wider machinery safety coverage, explore workplace machinery prohibition signs to match operating restrictions with access and guarding messages. Helps create a safer production environment.

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