Saying free or available rather than busy may be considered a more "positive" enquiry. It may also simply mean that you expect the person to be busy rather than free, rather than the other way
If so, my analysis amounts to a rule in search of actual usage—a prescription rather than a description. In any event, the impressive rise of "free of" against "free from" over
(13) It is recommended to maintain a consistent ratio of 1:1 or 2:1 of Battery Cabinets to Battery Inverter within the site to ensure optimal performance. For sites requiring discharge over 2
(12) Per collegare in parallelo due armadi batteria su un singolo inverter, è necessario un kit di prolunga cavi, CSS-O1-C-B01-XX, senza il quale l''installazione del secondo armadio batteria
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