What insulation rating is specified for these cables?

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Insulation rating is the maximum voltage the cable’s insulation is designed to withstand safely. For typical outdoor/indoor copper telecom and data cables, the standard rating is 300 volts. This provides a safe margin for low-voltage data networks while staying appropriate for communications cables. A 600-volt rating is used for power conductors and is more than what these cables require; 150-volt and 450-volt ratings are not the standard spec for this type of cable. So the specified insulation rating is 300 volts.