Explosion Proof Lighting Blog | Guides & Technical Articles

October 2026 · 9 min read

Buy the wrong explosion proof light and you usually find out at the worst possible moment: at the audit, after the installation, or in the incident report. In hazardous-area equipment the supplier decision carries legal weight, because the person who installs non-compliant Ex equipment owns the consequence — not the trader who sold it. This guide sets out the eight checks we would run if we were buying explosion proof lighting from an unknown supplier, and what a real manufacturer's answer looks like at each step.

Why Qualification Is Different for Ex Equipment

A failed office luminaire costs you a lamp. A non-compliant luminaire in a Zone 1 area is a different category of problem: the equipment is legally required to be certified for the zone it is installed in, and "the supplier told us it was fine" is not a defence in an incident investigation. That is why supplier qualification for explosion proof lighting is less about price negotiation and more about evidence collection.

The good news: this is a checks-based process, and most of the evidence can be requested in writing before you spend anything. The eight checks below take a procurement engineer a few hours. Skipping them is how projects end up with luminaires whose markings do not match their certificates.

Check 1: Verify Certificates, Not Logos

Every Ex supplier displays the ATEX and IECEx hexagon logos. The logo is not the evidence — the certificate number is. A genuine certificate number follows a fixed format (issuing body code, year, serial number) and can be looked up in the certification body's public register. An unverifiable "certificate" that exists only as a PDF in an email is worth nothing.

As an example of what a verifiable set looks like, our LO series linear lights carry ATEX certificate CSANe 25ATEX1229X and IECEx certificate IECEx CSA 25.0093X, and our FL8 flood light family carries ATEX certificate TÜV CY 26 ATEX 0207611 X — both issued by the notified bodies directly, both checkable in their public registers. Any supplier who cannot produce numbers in this format, for the exact model you are buying, fails this check.

Check 2: Production Quality Assurance (QAN)

This is the check most buyers have never heard of, and it is the one that separates certificate owners from manufacturers. An ATEX type certificate proves that one sample passed the type tests. It says nothing about the ten thousand units that follow. Under the ATEX framework, series production is covered by a Production Quality Assurance Notification (QAN): the notified body audits the factory's production quality system for Ex equipment and re-audits it periodically.

So the question to ask is not "do you have ATEX certificates?" but "what is your QAN number, and which notified body issued it?" A trading company can hold or borrow type certificates; only the actual production site can hold a QAN.

Our Shenzhen factory holds ATEX production quality assurance (QAN) and QAR registrations audited by CSA Group, alongside ISO 9001. We wrote about the audit process in this factory audit article — a supplier who has been through one will always be able to talk about it in specifics.

Check 3: Manufacturer or Trader?

There is nothing inherently wrong with trading companies, but in Ex equipment the chain matters: a manufacturer can change the production of a fitting in response to a field problem; a trader can only forward your question. Verify who you are actually talking to.

Check 4: Traceability From Nameplate to Certificate

The nameplate on the luminaire is the legal statement. Before shipment, check that for each model:

• The Ex marking on the nameplate is character-for-character identical to the marking on the certificate;
• The certificate number appears on the nameplate or in the documentation supplied with the fitting;
• The serial number or batch allows the manufacturer to trace back the production date and the components used;
• The nameplate manufacturer is the entity on the certificate — not a different company name.

A mismatch here is not a cosmetic defect. It means the unit shipped is not the unit that was certified, and no inspector will accept it.

Check 5: The Documentation Set

A serious Ex manufacturer ships a documentation package, not just a carton. Ask for the full set for one model before ordering:

If a supplier produces certificates quickly but goes quiet when asked for an installation manual or IES files, that tells you where their capability ends.

Check 6: Engineering Support Before the Sale

The cheapest moment to find out that a fitting is wrong for your area is before the purchase order. Give a real supplier a real problem and measure the answer: send them your area classification ("Zone 2 outdoor, gas group IIB, T3, coastal site, -5 °C to +45 °C") and ask which models they propose and why. A manufacturer's answer will reference protection concepts, gas groups, temperature classes and corrosion category. A reseller's answer will reference a price list.

Two questions worth asking explicitly: whether the proposed luminaires hold their certificate in your gas group and temperature class (an IIB T6 fitting covers T3, but the reverse is not true), and whether the corrosion protection matches the site — for coastal and offshore environments, C4 per ISO 12944 is the working minimum.

Checks 7 and 8: After-Sales and Commercial Stability

Check 7 — after-sales reality. Ask: what is the warranty in writing, which spare parts (glands, gaskets, LED modules, drivers) are held for how many years, and what happens if a unit fails in service. Our own terms, for reference: a five-year warranty on the flood light families, MOQ of 100 pieces with sample and small-batch orders accepted during early cooperation, samples in roughly a week and bulk orders in three to four weeks.

Check 8 — commercial stability. Ex luminaires stay installed for ten to fifteen years. Ask how long the supplier guarantees spare parts and mechanical compatibility for the model you are buying. A factory running its own production can answer in years; a trader can only answer in shipping cycles.

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