// CODE SNIPPET
230.51 Mounting Supports
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Cables that are not approved for mounting in contact with a building or other structure shall be mounted on insulating supports installed at intervals not exceeding 4.5 m (15 ft) and in a manner that maintains a clearance of not less than 50 mm (2 in.) from the surface over which they pass.
Individual open conductors shall be installed in accordance with Table 230.51(C). Where exposed to the weather, the conductors shall be mounted on insulators or on insulating supports attached to racks, brackets, or other approved means. Where not exposed to the weather, the conductors shall be mounted on glass or porcelain knobs.
Table 230.51(C) Supports
|Maximum Volts||Maximum Distance Between Supports||Minimum Clearance|
|Between Conductors||From Surface|
|*Where not exposed to weather.|