FIXED HEATING FOR PIPELINES

70-381 (b) Temperature Controller Without "Off" Position. Temperature controlled switching devices that do not have an "off" position shall not be required to open all ungrounded conductors and shall not be permitted to serve as the disconnecting means. (c) Remote Temperature Controller. Remote controlled temperatureactuated devices shall not be required to meet the requirements of Section 426-51(a). These devices shall not be permitted to serve as the disconnecting means. (d) Combined Switching Devices. Switching devices consisting of combined temperature-actuated devices and manually controlled switches that serve both as the controller and the disconnecting means shall comply with all of the following conditions: (1) Open all ungrounded conductors when manually placed in the "off" position; and (2) Be so designed that the circuit cannot be energized automatically if the device has been manually placed in the "off" position; and (3) Be provided with a positive lockout in the "off" position. 426-52. Overcurrent Protection. Fixed outdoor electric deicing and snow-melting equipment shall be permitted to be protected against overcurrent where supplied by a branch circuit as specified in Section 426-4. 426-53. Equipment Protection. Ground-fault protection of equipment shall be provided for branch circuits supplying fixed outdoor electric deicing and snow-melting equipment. 426-54. Cord- and Plug-Connected Deicing and Snow-Melting Equipment. Cord- and plug-connected deicing and snow-melting equipment shall be listed.