Josh Sargent, Gabriel Sara and Ashley Barnes all got their names on the scoresheet as Wagner’s side made it six wins from their last nine matches.
Victory keeps the Canaries in sixth place – the fourth and final playoff spot – but they are now three points clear of seventh-placed Hull, having played a game more.
“It was another very, very good performance away from home,” said a delighted Wagner.
“The guys looked super sharp, super solid defensively, super aggressive and, with the ball, they played some wonderful football, scored great goals and had chances for more.
"They have a lot of confidence at the moment. They're brave on the ball as well everybody knows what he has to do and likes to do.
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