Find a matched source
Look for a safely accessible complete-set plate or the exact manufacturer specification. Record the frequency as written and photograph the whole source. If an existing listing omits Hz, do not fill the gap from the seller’s country or site address. Equipment can have a history that the current location does not explain.
Keep specification combinations together
When documents show more than one configuration, preserve each frequency and its associated rating information as a separate entry. Do not combine the kW figure from one row with the Hz value from another. If you cannot determine which entry applies, share the document and explicitly mark the current configuration unconfirmed.
Avoid an unsupported conversion claim
A buyer’s interest in a different frequency is a question for equipment-specific technical review. Do not promise that a setting change will make the generator suitable, and do not operate it differently to demonstrate that claim. Ask the buyer to identify the documentation needed for its own qualified evaluation.
Use a simple specification sentence
Write: documented rating [value and unit], category [as stated], frequency [Hz], voltage [as stated], source [plate or document/date]. If any element is uncertain, say which one. This keeps a sales email, inventory row and formal package consistent without presenting a partial specification as complete.