Madalpingelised elektripaigaldised. Osa 5-55, Elektriseadmete valik ja paigaldamine. Muud seadmed. Jaotis 551, Madalpingelised generaatoragregaadid = Low-voltage electrical installations. Part 5-55, Selection and erection of electrical equipment. Other equipment. Clause 551, Low-voltage generating sets (IEC 60364-5-55:2001/A2:2008 (Clause 551))