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UTP nao tem blindagem física interna, sua proteção é o "efeito de cancelamento", onde mutuamente reduz a interferência eletromagnética de radiofrequência.
Unshielded twisted pair (UTP) cables are found in many Ethernet networks and telephone systems. For indoor telephone applications, UTP is often grouped into sets of 25 pairs according to a standard 25-pair color code originally developed by AT&T Corporation. A typical subset of these colors (white/blue, blue/white, white/orange, orange/white) shows up in most UTP cables.
https://en.wikipedia.org/wiki/Twisted_pair