Transmission tower signs protect your workers and the public by clearly communicating high-voltage hazards on electrical transmission structures. Whether you need standard “DANGER – KEEP OFF” signs, ANSI-compliant warning placards, or custom signs with your company name and permit information, Tech Products builds them to last decades in the harshest outdoor conditions.

Our transmission tower signs are manufactured using EVERLAST injection-molded polypropylene and Tech-3D embossed aluminum, both proven to withstand saltwater, acid rain, groundwater, chemicals, and UV exposure. UL tested with 40 years and no change in legibility, these signs are trusted by electric utilities across the country for transmission line, substation, and distribution infrastructure.

EVERLAST Injection Molded Signs

EVERLAST signs are injection molded from solid polypropylene at a full 1/4″ thick. The letters go completely through the sign rather than being printed or painted on the surface, which means they cannot be scratched off, worn away, or faded by UV exposure. These signs have been UL tested by Underwriters Laboratories with 40 years and no change in performance.

EVERLAST signs are available in stock and ready to ship in the following materials and expected service life:

Material	Legibility Method	Expected Life
Polypropylene (Orange/Yellow)	Black Characters	40+ Years
Aluminum	Foil	40+ Years
Stainless Steel	Foil	40+ Years
Fiberglass	Foil	30+ Years
Polyethylene	Engraved	20+ Years

Standard Transmission Signs

Tech Products carries a full line of stock transmission tower signs that are ready to ship. These signs meet ANSI and OSHA standards for high-voltage warning signage. Available options include:

SO101: DANGER – KEEP OFF!
SO102: DANGER – KEEP OFF!
SO103: DANGER – KEEP OFF!
SO104: DO NOT CLIMB!
SO101CANV: DANGER – ELECTRIC WIRES KEEP OFF
SO201CANV: WARNING – Keep Off High Voltage
SO202CANV: DANGER – Keep Off High Voltage
SO301CANV: DANGER – HIGH VOLTAGE UNDERGROUND CABLE
SO302CANV: DANGER – HIGH VOLTAGE OVERHEAD

All standard transmission signs are ANSI compliant. Let Tech Products help you meet your ANSI compliance requirements for electrical safety signage.

Custom Transmission Signs

When stock signs do not cover your exact requirements, our team can build custom transmission tower signs to your specifications. The custom sign process is straightforward:

Select your format: Choose between ANSI and OSHA standard layouts. Our team can advise on which standard applies to your application.
Select your wording: Tell us what you need the sign to say, and our art department will lay out the text for you.
Include your company name and logo: Add your branding for clear ownership identification on shared or public structures.
Select a graphic: Choose from over 200 pictorial graphics in our library, or have our art department create a new one for your project.

For pipeline marking applications, we recommend including your permit information or “SEE LOGO” designation. If you are unsure of your pipeline number, our team can help you find it.

High Voltage Signs

Tech Products manufactures 3-1/2″ x 14″ High Voltage signs that meet California requirements. These signs are available in polyethylene plastic or Tech-3D embossed aluminum, and both options withstand saltwater, acid rain, groundwater, chemicals, alkalis, and acid solutions.

SO381CANV: HIGH VOLTAGE sign with recessed score
3T196: High Voltage sign

The SO381CANV features a recessed score that lets you break the sign into two separate pieces for alternate mounting configurations.

Related Electrical Safety Signs

In addition to transmission tower signs, Tech Products manufactures a complete line of electrical safety signage for utilities and industrial facilities. Related products include substation warning signs, distribution signs, arc flash signs, and RF signs.

Why Utilities Trust EVERLAST Transmission Tower Signs

When a sign is mounted 50 feet up on a transmission tower, it needs to stay readable for decades without maintenance. That is exactly what EVERLAST signs deliver. The characters are molded through the full thickness of the sign, so there is nothing to peel, fade, or scratch off. UL testing confirmed 40 years with no change in legibility, and our signs are in service on transmission lines, substations, and distribution structures across the country.

Tech Products has been manufacturing identification and safety products for electric utilities since 1948. With over 77 years of experience and more than 200 sign graphics in our library, we can handle any standard or custom signage requirement. Browse our full product catalog or learn more about Tech Products.

Get a Quote on Transmission Tower Signs

Need transmission tower signs for your next project? Our team can help with stock signs, custom designs, and ANSI compliance. Call us at 1-800-221-1311 or request a quote online.

Frequently Asked Questions About Transmission Tower Signs

What are transmission tower signs made of?

Tech Products transmission tower signs are available in several materials depending on your durability and budget requirements. EVERLAST signs are injection molded from 1/4″ thick polypropylene with characters that go completely through the sign. Signs are also available in aluminum, stainless steel, fiberglass, and polyethylene. Aluminum and stainless steel signs offer 40+ years of expected service life.

How long do transmission tower signs last?

EVERLAST polypropylene and aluminum transmission signs have been UL tested by Underwriters Laboratories with 40 years and no change in legibility. Stainless steel signs also offer 40+ years. Fiberglass options last 30+ years, and polyethylene signs provide 20+ years of service. Actual lifespan depends on environmental conditions, but these are among the longest-lasting utility signs available.

Are your transmission tower signs ANSI compliant?

Yes. Tech Products stock transmission signs are designed to meet ANSI and OSHA standards for high-voltage safety signage. For custom signs, our team can advise on the correct standard (ANSI or OSHA) for your specific application and design your sign accordingly.

Can I order custom transmission tower signs with my company logo?

Yes. Tech Products offers fully custom transmission tower signs. You can specify the format (ANSI or OSHA), wording, company name and logo, and choose from over 200 pictorial graphics or request a new custom graphic. Our art department handles the layout. Call 1-800-221-1311 to start a custom order.

What sizes are available for high voltage signs?

Tech Products manufactures 3-1/2″ x 14″ High Voltage signs that meet California requirements. These are available in polyethylene plastic or Tech-3D embossed aluminum. The SO381CANV model features a recessed score that allows the sign to be broken into two separate pieces for flexible mounting options. Additional sizes are available through custom orders.