I'm not sure if you can get a special type of cable or not, but regular Cat5 has a PVC jacket. The melting point of PVC is 212°C, the glass transition temperature is around 80°C. So it's possible that over time, contact with a 100°C steam pipe may deform the cable enough to cause shorts.
Actually, I just looked at some cable that I have and it has a maximum temperature of 60°C stamped on it.
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"Empirically observed covariation is a necessary but not sufficient condition for causality" - Edward Tufte
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