| http://www.w3.org/ns/prov#value | - Duct systems for supply cables, when concurrently installed with gas, water, oil or other pipe systems, or other foreign substructures, shall be installed with the separation required by Rule 31.4-A1 except that by mutual agreement between all of the parties involved there may be less separation for duct systems for supply cables of 0 - 750 volts.
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