Electric Boilers

Electric Boilers 1. Electric boilers 600 volts or less subject to the requirements of the Safety Act and these rules and regulations shall bear the Underwriter's laboratories label on the completed unit or assembly by the manufacturer. This label shall be in addition to the code symbol stamping requirements of the ASME and the National Board. 2. All appliances required for electric boilers shall be attached in accordance with the following rules: 3. A cable at least as large as the income power line to the boiler shall be provided for grounding the boiler shell. This cable shall be permanently fastened to the boiler and grounded in an approved manner. 4. Conductor or conductors shall be attached by means of suitable connectors, lugs, pressure connectors, clamps or other approved means, Connectors that depend on solder to maintain connection shall not be used. 5. A suitable screen or guard shall be provided around high tension bushings and a sign posted warning of high voltage. This screen or guard shall be so located that it will be impossible for anyone working around the boiler to come in contact accidentally with the high tension circuit. 6. When adjusting safety valves, the power circuit to the boiler shall be open. The boiler may be under steam pressure, but the power line shall be open while the operator is making the necessary adjustment. 7. Safety or relief valves shall have a relieving capacity of three and one-half (3 1/2) pounds per hour for each kilowatt maximum rating.