Ex equipment spare parts: identify before ordering
This FAQ concerns buying replacement parts for existing hazardous-area equipment. It is not a repair manual, a universal approved-parts list or confirmation that MMAIATEX supplies an interchangeable part for another manufacturer's equipment. The purchasing checklist below is practical document-control advice, not a reproduction of a standard's mandatory form.
Separate three decisions: what the installed equipment is, what replacement is permitted, and who may perform and release the work. An order confirmation only addresses the commercial transaction. It cannot answer all three technical questions.
1. What information should a spare-parts enquiry include?
Provide the equipment manufacturer, exact model and variant, available serial or batch identification, full marking and original part number. Add the applicable instruction or drawing revision, a description of the fault and clear photographs where safe to obtain. Explain whether you need an identical replacement or are proposing an alternative. Our Ex marking guide helps distinguish equipment identification from a general product description.
2. Is a photograph enough to identify a replacement?
No. A photograph can help locate a component, but it may not reveal its material, internal construction, revision or approved relationship to the complete equipment. Treat it as supporting evidence. If the marking is unreadable, ask the manufacturer how to recover the identity from other records. Do not describe a visually similar catalogue item as a confirmed replacement merely because its front face looks correct.
3. Does the same voltage and current rating prove equivalence?
No. Those ratings answer only part of the selection question. The relevant documentation may also distinguish construction, interfaces, thermal behavior or the protection arrangement. Ask which characteristics must match for this particular replacement, rather than constructing a universal list from a generic catalogue. Keep electrical-function review separate from the evidence needed to preserve explosion protection and any other safety-related function.
4. What if the original part number has been superseded?
Request a documented link from the old number to the new one, including the affected equipment variants and any limits on the change. A supplier's note saying "new version" does not explain whether older assemblies need additional changes. Keep the supersession statement with the purchase record. Where the statement excludes your variant or leaves its applicability unclear, hold the substitution for clarification before technical release.
5. Can a distributor confirm that a substitute is acceptable?
A distributor can provide traceability and pass on manufacturer documentation, but a sales quotation alone is not the technical basis for acceptance. Ask who issued the compatibility statement and what exact equipment it covers. If the proposed item differs from the documented replacement, identify the responsible technical decision-maker. Do not turn a supplier's commercial assurance into an unsupported declaration about the equipment's certification.
6. Does every replacement part need its own Ex certificate?
There is no useful blanket answer for every spare. Establish whether the item is equipment, an Ex Component, or a part specified within a documented assembly, then obtain the evidence appropriate to that role. A separate certificate does not by itself establish compatibility with the complete equipment. Conversely, the absence of a separate certificate number on a small part is not enough to decide its status. See our X and U suffix guide.
7. May a gasket, fastener or operator head be chosen by dimensions alone?
No. Matching dimensions are a starting point for identification, not a release decision. Request the applicable replacement specification or part reference and any relevant assembly instructions. Avoid assigning your own material, tightening value or modification method from a photograph. If the original documentation is unavailable, escalate the gap instead of filling it with a general hardware specification. This FAQ intentionally gives no installation values.
8. Can a replacement be taken from another unit?
Do not assume that it can. A donor item may have a different revision, unknown service history or damage that a basic function test does not reveal. If reuse is proposed, it needs an appropriate documented technical assessment and traceable decision. Record the donor identity and the reason for acceptance or rejection. An urgent production need does not resolve missing information about the proposed part.
9. What happens when the manufacturer no longer supports the equipment?
Record the support gap and consult a competent party about the available options. These may include obtaining suitable documentation, a properly assessed repair route or replacing the complete equipment. Do not assume that any workshop can approve an undocumented substitute. IECEx's service-facility FAQ stresses access to necessary equipment documentation. Its cited Part 19 clause is from Edition 4; the current IEC publication is Edition 5, so do not silently transfer clause numbering.
10. Does buying the correct spare authorize a repair?
No. Purchasing a part and authorizing work are separate decisions. IEC 60079-19:2025, Edition 5, addresses service-facility repair, overhaul and reclamation within its stated scope. Its exclusions include repair or overhaul of protection type m and Ex Components, and requirements for manufacturers repairing their own equipment. Do not use its title as permission for every proposed intervention. The responsible technical party must determine the applicable route.
11. Who should release the equipment after replacement work?
Use the responsibilities assigned by the site's procedures and the applicable technical requirements. Purchasing should preserve the evidence without claiming to approve an installation. HSE guidance emphasizes competent maintenance in explosive atmospheres; IEC 60079-17:2023 addresses inspection and maintenance of hazardous-area electrical installations. A paid invoice or successful on/off test does not replace the required technical review and release records.
12. What records should stay with the spare-parts order?
Retain the equipment identity, original and supplied part references, relevant revisions, traceable supplier information and the document supporting the replacement decision. Include the disposition of any proposed deviation and identify who authorized it. Keep the order record linked to the resulting maintenance or repair record. This makes a later enquiry answerable without relying on someone's memory of a telephone conversation.
MMAIATEX certification status
The public About page of MMAIATEX Explosion-proof Technology (Zhejiang) Co., Ltd. describes ATEX, IECEx and CCC certification as in progress at this review. This article and its representative product photograph do not establish certification, cross-brand interchangeability or suitability for a particular installation. Request current evidence for the exact product and proposed use.
Safety disclaimer
This is general procurement guidance, not an instruction to dismantle, modify, energize or repair hazardous-area equipment. Follow applicable law, manufacturer instructions and competent site procedures. Keep unresolved replacement questions open until the responsible technical party has decided the safe course of action.
Contact MMAIATEX about a spare-parts enquiry
Send the exact equipment and part identities, available documentation and the intended replacement request. Ask what product-specific information is available before making an interchangeability assumption.