As a rule, +-130VDC was only found on analog carrier circuits (which would be VERY rare to find anymore), old style payphone circuits (only when operating, +130 signals the phone to collect the coins, -130 signals the phone to refund the coins), or legacy repeatered long run T1 circuits. The +-130VDC on analog carrier circuits and repeatered T1 spans is fused at only .180A so it doesn't require 1000V gloves to handle :roll: (Class A3 voltage).
Modern T1 over HDSL/HDSL2/HDSL4 uses approximately 180VDC for span powering, however, the 180VDC is limited to 1mA and not present until both ends of the circuit are connected (Class A2 span powering voltage).
If anyone really cares, the standard for this is Bellcore standard GR-1089-CORE. Rubber gloves aren't required until Class AB voltage (up to 90VDC or 90VAC, up to 15A, up to 1350VA).
Vern