Yes, 30 Mbps is enough to stream HD videos on Netflix on TV. According to Netflix's official help page on internet connection speed recommendations, here are the recommended download speeds for different video qualities:
Given that you have an internet speed of 30 Mbps, it is more than sufficient to stream Netflix in Ultra High Definition (4K) quality on your TV. You'll have a smooth streaming experience without any buffering issues, provided there aren't too many other devices using the same connection simultaneously.
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