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Python 3, 74 bytes lambda n:"╔"+"╦"*(n-3)+"╗\n"+("╠"+"╬"*(n-3)+"╣\n")*(n-2)+"╚"+"╩"*(n-3)+"╝" Try it online!
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# [Python 3], 74 bytes <!-- language-all: lang-python --> lambda n:"╔"+"╦"*(n-3)+"╗\n"+("╠"+"╬"*(n-3)+"╣\n")*(n-2)+"╚"+"╩"*(n-3)+"╝" [Try it online!][TIO-ksrbqd0k] [Python 3]: https://docs.python.org/3/ [TIO-ksrbqd0k]: https://tio.run/##K6gsycjPM/6fZhvzPycxNyklUSHPSunR1ClK2kBymZKWRp6usSaIPT0mT0lbA8hYAJZagyS1GCilCeIagbmzwApWIimYq/Q/Lb9IIVMhM08h2kTHQsfIINaKi7OgKDOvREPJM6@gtETBSkknUxMu5l9aAhYEWZqmkQk0BWTHfwA "Python 3 – Try It Online"