Navigating Data Center Safety Signage: Your Essential OSHA & ANSI Compliance Guide

Data centers are the backbone of the world we live in today, powering everything from cloud computing and streaming services to financial transactions and enterprise applications. These facilities are built for reliability and high performance. However, they also contain high-voltage electrical systems, dense server racks, backup power equipment and sophisticated cooling systems. All of which can be very dangerous for the people who work there.

To keep employees, contractors and visitors safe, data centers need to use standardized safety signs all around the facility. The OSHA 29 CFR 1910.145 standard and the ANSI Z535 series establish requirements for safety sign design, colors, wording, and placement.

This guide talks about the safety signs, stickers and labels that every modern data center should use. It is organized by the type of hazard and the area of the facility.

1. Electrical Room Signs and Labels are Top Priority

Electrical Room Signs are one of the biggest risks in any data center. Proper labeling helps facilities follow the rules from OSHA, ANSI and NFPA 70E, and it reduces the risk of injury from shock or arc flash incidents.

DANGER - High Voltage Signs

Features a white-on-red OSHA DANGER header and is placed at main distribution panels, UPS units, transformers and switchgear. DANGER - High Voltage Signs alerts persons about high-voltage equipment that could cause injury or death if they are not careful.

WARNING - Arc Flash and Shock Hazard

Arc Flash signs has text on an orange background and is placed at Remote Power Panels, Power Distribution Units and server racks. The labels should include information about arc flash distances and the required Personal Protective Equipment levels.

NOTICE - Keep aisle clear Sign or 36-Inch Clearance

Keep aisle clear Sign has text on a blue background and is placed at electrical panels or on the floor in front of electrical equipment. It reminds people to keep a distance from electrical panels.

CAUTION - Multiple Power Sources

The sign has text on a yellow background and is placed at server racks and dual-corded equipment with redundant power feeds. It alerts people that turning off one power source may not be enough to make the equipment safe.

2. Server Room and Raised Floor Safety

Server rooms have hazards beyond just electrical ones. Raised flooring, equipment and high-capacity cooling systems create additional risks that need to be communicated clearly.

CAUTION - Heavy Load/ Heavy Equipment

Caution: Heavy Equipment sign has text on a yellow background and is placed at server cabinets, rack-moving equipment and floor sections with weight limitations. It warns people about equipment and floor load restrictions.

CAUTION - Tile Removal and Open Floor Hazard

The sign has black text on a yellow background and is placed at temporary floor signs and Spill Clean-Up Signs or decals used when raised floor tiles are removed and floors are wet and contaminated. It alerts staff to trip and fall hazards.

NOTICE - Hot. Cold Aisle

The sign has text on a blue background and is placed at containment doors. It reminds people to keep containment doors closed to maintain airflow and cooling efficiency.

CAUTION - Hearing Protection Required

ANSI Caution Double Hearing Protection Required sign has text on a yellow background and is placed at entrances to server rooms or generator rooms where cooling equipment is very loud. It indicates that hearing protection is required before entering these areas.

3. Fire Suppression Systems (Clean Agent Systems)

Unlike commercial buildings, most data centers use clean agent fire suppression systems such as FM-200, Novec 1230 or Inergen instead of water sprinklers. Because these systems quickly remove oxygen or release fire-suppressing agents, clear warning signs are essential

WARNING – Clean Agent Fire Suppression System / Discharges May Cause Suffocation

Header: Black text on an orange background

Location: All entrances leading into the server room or white space

Purpose: Informs people that the room is protected by a clean agent system and that discharge can create an oxygen-deficient area.

DANGER – Do Not Enter When System Is Discharging

Header: White text on a red background

Location: Inside server rooms and near fire alarm strobes at entry doors

Purpose: Stops people from entering while the system is active.

NOTICE – Manual Abort / System Disconnect Switch

Header: White text on a blue background

Location: Above emergency abort buttons or manual discharge controls

Purpose: Directly over manual discharge handles or emergency abort buttons.

4. Battery Storage Signs & Backup Generators

Battery Storage Signs and backup generators bring dangers like harmful chemicals, explosive gases and machines that start on their own.

DANGER – Explosive Gases / No Smoking, Matches or Open Flames

Header: White text on a red background

Location: Battery room entrances with VRLA or wet-cell lead-acid batteries

Purpose: Tells people about hydrogen gas. Stops anything that could start a fire.

WARNING – Chemical Hazard / Corrosive Electrolyte

Header: Black text on an orange background

Location: Battery cabinets and battery storage areas

Purpose: Warns workers about dangerous battery acid and electrolytes.

SAFETY / AID – Eyewash Station / Emergency Shower

Header: White text on a green background

Location: Above eyewash stations and emergency showers near wet-cell battery setups as required by OSHA 1910.151(c)

Purpose: Helps people find safety equipment quickly in an emergency.

WARNING – Automatic Generator Start-Up

Header: Black text, on an orange background

Location: Generator enclosures

Purpose: Alerts personnel that generators can start without warning.

ANSI Signal Word Color Reference

Using the ANSI Z535 signal word color rules makes sure every safety message is easy to recognize.

Choose Materials That Will Last for Data Center Compliance

Inside high-density data centers, hot-aisle containment temperatures can rise substantially. Standard paper or low-grade adhesive labels will quickly peel, warp, or fade under heat.

To ensure long-term durability, safety stickers and labels on server racks, electrical cabinets, power equipment and floor panels should be made with vinyl that can handle high temperatures and high-performance adhesive that resists peeling over time.

Using quality materials helps make sure that important safety information is always easy to see and follows the rules throughout the life of the equipment.

Official Compliance and Regulatory Resources

When you are getting ready for safety inspections or compliance audits look at these rules and publications.

1. Official OSHA Compliance

• OSHA 29 CFR 1910.145 – This is about signs and tags that prevent accidents, including words, colors and what safety signs are needed.
• OSHA 29 CFR 1910.303 – This is about things like what equipment needs to be labeled and how much space is needed to work safely.
• OSHA 29 CFR 1910.151(c) – This is about help and first aid for emergency eye wash stations.

2 Official ANSI Compliance

• ANSI Z535 Standards Overview – This is about the rules for safety colors, symbols and sign design.
• ANSI Webstore – This is where you can find the official ANSI Z535 rules for safety colors, signs, symbols and labels.

For additional safety signage options, explore our OSHA Safety Signs collection and ANSI Safety Signs collection to find signs suitable for different Data Center hazards and safety communication needs.

Get Compliant with StickerJet

At StickerJet we make it easy to create custom safety stickers, labels and banners that meet your data center needs. Whether you have one server room or many data centers, We provide durable labeling solutions designed for long-term performance.

1. No minimum order quantities

You can order what you need from one label to thousands of custom safety decals.

2. Our labels are very durable

Our labels are manufactured using high-quality materials, fade-resistant inks, and durable adhesives designed for demanding data center environments.

3. You can customize everything

You can choose the size, shape, material and layout you want. You can upload your design or text and our design team will help you make labels that follow the compliance rules.

Keep your data center safe and follow OSHA and ANSI rules. Order your custom safety labels at stickerjet.com today.

Compliance Disclaimer

StickerJet makes safety labels and signs that people can use. We follow the rules that ANSI Z535 and OSHA have for colors. It is up to the person who buys these labels and signs to make sure they follow the rules for their place. They have to pick the signs and put them up where they are supposed to go. StickerJet helps with the labels and signs. It is the buyer's job to use them correctly and follow the rules of safety labels and signs.