OSHA, NEC and CEC Requirements for Phones in Hazardous Locations

Searches for the OSHA requirements for an intrinsically safe iPhone, iPad or Google Pixel all lead back to the same answer. In the United States, OSHA requires electrical equipment in a hazardous (classified) location to be intrinsically safe, approved for the location, or demonstrably safe for it. In practice, approval means listing by a Nationally Recognized Testing Laboratory (NRTL) for the Class, Division or Zone defined in the National Electrical Code (NEC).

Canada works through the Canadian Electrical Code (CEC) and equipment certified by accredited bodies. IEEE sets no device requirements of its own, and ATEX or IECEx certification alone is not accepted in either country. Below, we follow the chain of rules from regulator to site and set out what to check before a cell phone or tablet goes into a classified area.

Who sets the rules for cell phones in US hazardous locations?

No single document decides whether a phone can be carried into a US hazardous location. The requirement passes through four layers, and each one answers a different question.

1. OSHA sets the legal duty. For general industry, 29 CFR 1910.307 covers electrical equipment in hazardous (classified) locations, and construction work follows the parallel rule in 29 CFR 1926.407. The duty to comply sits with the employer.
2. The NEC (NFPA 70) defines classification and equipment rules. NFPA publishes a new edition every three years, most recently in 2026, but states and cities adopt editions on their own schedules. A site in one state may work to the 2023 code while a site in another still follows the 2020 or 2017 edition.
3. The authority having jurisdiction (AHJ) enforces the code on site. Depending on the location, the AHJ can be a state or municipal electrical inspector, the fire marshal, the facility owner's engineering group or an insurer.
4. NRTLs test and list the equipment. OSHA recognizes NRTLs under 29 CFR 1910.7, and the names hazardous location buyers see most often are UL Solutions, CSA Group, FM Approvals and Intertek.

Mining sits outside this chain. Mines fall under the Mine Safety and Health Administration (MSHA), which runs its own approval program for "permissible" electrical equipment used underground, separate from OSHA and the NRTL system.

What OSHA requires for phones and tablets

29 CFR 1910.307 gives employers three routes for equipment in a classified area. The equipment can be approved as intrinsically safe, approved for the hazardous location in question, or of a type and design the employer can demonstrate is safe for that location. Under the second route, the equipment must suit both the class of location and the specific gas, vapor or dust present, and must be marked with its class, group and operating temperature.

"Approved" has a specific meaning here. OSHA's definitions in 29 CFR 1910.399 make approved equipment that which is acceptable to OSHA, and equipment is acceptable when an NRTL has listed, labeled or certified it as safe. Other paths exist for equipment types no NRTL tests, but for a phone or tablet the practical requirement is an NRTL listing for the Class and Division, or Class and Zone, where the device will be used. The third route places the full burden of proof on the employer, and few safety teams are in a position to make that case for a consumer device whose circuitry they cannot assess.

This settles the common question of OSHA requirements for intrinsically safe iPhones, iPads and Google Pixels. Standard iPhone, iPad and Google Pixel models carry no hazardous location listing from any NRTL, so in their standard form none of them meet OSHA's equipment requirements in a classified area. Equipping a US crew with mobile devices for these areas means choosing hardware listed for the specific location, whether a purpose-built intrinsically safe cell phone, a listed tablet or another listed protection method.

Some sites allow unrated devices into a Division 2 area as a controlled exception, typically under a permit with continuous gas monitoring. Our guide to Class 1 Div 2 requirements for mobile devices covers how those programs usually work. OSHA requires Zone areas, and Division areas classified after August 13, 2007, to be documented, so the area classification drawing is the starting point for any device decision.

Class/Division and Zone under the NEC

The NEC contains two classification systems side by side. The traditional Class and Division system sits in Articles 500 to 504, and the IEC-aligned Zone system sits in Articles 505 and 506.

• Article 500 sets out the general rules and definitions for Class and Division. Class I covers flammable gases and vapors, Class II combustible dusts and Class III ignitible fibers and flyings. Division 1 applies where ignitible concentrations can exist in normal operation, and Division 2 where they are not likely to exist in normal operation.
• Article 501 sets the installation rules for Class I locations. Section 501.5 permits zone equipment listed and marked with the US AEx marking in Division 2 locations for the same gas and a suitable temperature class, while only Zone 0 equipment is permitted in Division 1.
• Articles 502 and 503 apply the same structure to Class II dusts and Class III fibers and flyings.
• Article 504 covers the installation of intrinsically safe systems, including the apparatus, associated apparatus and control drawings.
• Articles 505 and 506 define Zones 0, 1 and 2 for gases and vapors and Zones 20, 21 and 22 for dusts, with equipment marked "AEx".

For the detail behind each system, see Class 1 Div 1 vs Div 2, the Class I Division 2 guide linked above, and our comparison of ATEX vs IECEx vs NEC.

Canada: the CEC and equipment certification

Canada's equivalent of the NEC is the Canadian Electrical Code, Part I, published by CSA Group as CSA C22.1. The current edition is 2024. Hazardous locations are covered in Section 18, which has used the Zone system for new installations since the late 1990s. Appendix J, through Annex J18, holds the Class and Division rules, which still apply at many existing facilities and their extensions.

The CEC has legal force only once a province or territory adopts it, and each does so through its own regulation, sometimes with local amendments. Enforcement sits with the provincial or territorial electrical safety authority, such as the Electrical Safety Authority in Ontario or Technical Safety BC. Workplace safety duties also come mainly from provincial occupational health and safety rules, so Canada has no single national body playing OSHA's role for most employers.

Equipment must be certified by a certification body accredited by the Standards Council of Canada (SCC), or field-evaluated by an accredited inspection body. CSA Group, UL Solutions, Intertek and QPS are among the accredited bodies, and many products carry a combined mark, such as cULus, that covers both countries. On zone equipment, the marking convention differs at the border. Canadian zone equipment carries the IEC-style "Ex" marking, for example Ex db IIB T4 Gb, while the US version of the same marking begins with "AEx". For Division 2 specifics, the Class I Division 2 guide covers where Division 2 sits in both the NEC and the CEC.

What IEEE does and doesn't cover

IEEE is a professional association and standards developer, and its work is widely used by engineers in the oil, gas and chemical sectors. It publishes engineering standards and guides, such as IEEE 1349 on motors in Division 2 and Zone 2 locations, and industry research through its Petroleum and Chemical Industry Committee (PCIC). That research includes a paper by Bozek, Martin and Cole, and we look at the PCIC study on cell phones in Division 2 locations in more depth in our Class I Division 2 guide.

IEEE does not certify, list or approve devices, and no IEEE document sets a requirement that a phone or iPad must meet before entering a classified area. Those requirements come from OSHA, the NEC as adopted locally, and the AHJ. Searches for IEEE requirements for an intrinsically safe iPhone therefore lead back to the same NRTL listing question covered above.

Can you use ATEX or IECEx phones on a North American site?

Not on their own. ATEX is a European Union legal framework and IECEx is an international certification scheme, and neither is recognized as an NRTL listing in the US or as SCC-accredited certification in Canada. US zone equipment must be listed and carry the AEx marking, and Canadian equipment must be certified by an accredited body, regardless of the certificates it holds elsewhere.

The technical gap is often smaller than the paperwork gap. UL 60079 and CSA C22.2 No. 60079 standards are based on the IEC 60079 series, so test data from an IECEx assessment can support a North American certification. The certificate itself does not transfer, though, and the North American certification has to be issued separately. Terminology also shifts at the border. The NEC uses "explosionproof" for Class and Division equipment, while IEC standards use "flameproof", and both describe an enclosure built to contain an internal ignition and stop flame from reaching the surrounding atmosphere. Our guide to explosionproof vs flameproof protection explains the differences.

For operators with sites on several continents, this usually means separate approvals by region. A device fleet certified for Zone 1 in Europe may need a different model or additional certification for its US or Canadian sites, and procurement teams should check each region's requirements before standardizing.

Xshielder covers are certified under ATEX and IECEx for Zone 1 and Zone 21, which covers sites in Europe and other markets that accept IECEx. They are not listed for NEC or CEC hazardous locations.

What to check before buying a phone for a US or Canadian site

The table below summarizes what to look for under each system. The protection method matters too, since the standards for nonincendive vs intrinsically safe equipment set different limits on where a device can be used.

Before buying, match the device's marking to the area classification drawing, including the gas group and temperature class, and check that the listing mark comes from an NRTL or an SCC-accredited body. Listings usually cover the device as tested, including its specified battery and accessories, so swapping parts can take a device outside its listing.

This page is general orientation and should not be read as legal advice. The final decision on any device rests with the employer and the AHJ, so confirm the details with your site safety program before equipment goes into a classified area.

If your operations include Zone 1 sites working under ATEX or IECEx, our ATEX and IECEx certified covers for the iPhone 17 Pro Max, iPhone 17, iPhone 16 Pro Max and iPad Pro 11" bring current Apple hardware into those areas. Get in touch to talk through mobility across your hazardous area sites.

Frequently asked questions

Does OSHA require intrinsically safe phones in hazardous locations?

Not specifically. Under 29 CFR 1910.307, equipment in a classified location must be intrinsically safe, approved for that location, or demonstrably safe for it, so an intrinsically safe phone is one compliant option alongside other listed protection methods.

Can you use an iPhone in an OSHA-regulated hazardous location?

A standard iPhone carries no NRTL hazardous location listing, so it does not meet OSHA's equipment requirements in a classified area. Sites that admit unrated phones generally do so only as a controlled exception under a permit and gas monitoring.

Does IEEE have requirements for intrinsically safe phones?

No. IEEE publishes engineering standards and research but does not certify devices or set requirements for phones in hazardous locations; those come from OSHA, the NEC and the local AHJ.

Is ATEX certification accepted in the United States?

Not on its own. US hazardous location equipment needs listing by an OSHA-recognized NRTL, and zone equipment must carry the AEx marking under NEC Article 505.

Who certifies hazardous location equipment in Canada?

Certification bodies accredited by the Standards Council of Canada, such as CSA Group, UL Solutions and Intertek, certify equipment for Canadian hazardous locations under the Canadian Electrical Code.