By Nick Carey LONDON (Reuters) – Siemens expects high double-digit growth in electric chargers for bus fleets and trucks and to be in the top three companies in that rapidly growing global market thanks to the acquisition of Dutch charger maker Heliox, a top executive said. Speaking ahead of the close of the deal on Thursday, Matthias Rebellius, a board member at Siemens and CEO of the German group’s smart infrastructure business, told Reuters that Heliox is “a perfect expansion of our business”. Terms of the deal have not been disclosed. “Together with Heliox we’re now perfectly positioned fo…