Certification & Standards

A generating set arrives with paperwork, and the paperwork falls into two very different families that are frequently confused. Management system certificates describe how an organisation works. Product standards describe what a machine must do and how it must be measured. A supplier holding the first tells you nothing about the second, and a machine meeting the second can come from an organisation that holds no certificates at all.

This page sets out what the common marks and references actually cover, so that an offer document can be read for what it says rather than for how impressive it looks.

Management system standards

ISO 9001 is the quality management system standard. It requires an organisation to define its processes, control its documents, manage nonconformity and improve, and it is audited by a certification body. It says that a company has a system for doing what it says it does. It does not certify any product, and it does not mean a given set was tested.

ISO 14001 does the same for environmental management, and ISO 45001 for occupational health and safety. All three are organisational. Their practical value to a buyer is indirect but real: an organisation that can produce traceable records for its own processes can usually also produce the test record for your machine.

Product standards, which are the ones that bite

ISO 8528 is the reference that runs through the whole of the generator set section. Its first part defines the duty ratings, emergency standby, prime and continuous, that decide how many hours a machine may run and at what load factor. Later parts cover performance classes for voltage and frequency behaviour, vibration and noise measurement. When a specification asks for performance class G3, it is asking for a defined limit on voltage and frequency deviation under load steps.

ISO 3046 governs how the engine's own output is declared and the reference conditions it is declared at, which is where the ambient temperature, barometric pressure and humidity corrections come from. IEC 60034 governs the alternator, including insulation class and temperature rise limits, and IEC 60529 gives the IP code that describes what the enclosure keeps out.

Test records, which are worth more than certificates

A factory acceptance test report records what an individual machine actually did on a specific day: the output achieved, the voltage and frequency behaviour across load steps, the temperatures reached, the fuel consumption measured, and the ambient conditions under which all of it was recorded. Unlike a certificate, it is about your machine.

A site acceptance test does the same after installation, and the two together are the pair a buyer should insist on. The staging, the hold times and the log sheet content for such a test are set out in the load bank testing guide, which is written around exactly this document.

Emissions and market access

Exhaust emission requirements are the certifications that decide what may legally be installed where. EU Stage V and the US EPA Tier framework set limits by engine power band and application, and they distinguish between mobile machinery and stationary generating plant, with different rules and different transitional arrangements. Because they attach to the engine rather than to the set, an assembler cannot make a non-compliant engine compliant by putting a better canopy around it.

For a buyer the practical question is narrow: which certification does the engine hold, for which market, and does the intended installation fall inside it. That question belongs on the enquiry rather than on the delivery note, and it interacts with the roles described in the OEM, assembler and distributor explainer.

Where an engine brand authorisation forms part of the offer, its scope is a separate question again, covered in the OEM authorisation page. And where the documents themselves are being collected for a project file, the formats are described in the technical documentation library.