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(B) TRANSFORMERS. Transformers shall comply with the following; <br />1. VOLTAGE. The transformer secondary open - circuit voltage shall not <br />exceed 15,000 volts with an allowance on test or 1000 volts additional. <br />In end - grounded transformers the secondary, openrcircuit voltage shall <br />not exceed 7,500 volts with an allowance on test of 500 volts additional. <br />2. TYPE. Transformers shall be of a type approved for the purpose and <br />shall be limited in rating to a maximum of 4500 volt- amperes. Open core- <br />and -coil type transformers shall be limited to 4,000 volts with an allow- <br />ance on test of 500 volts. Transformers for outline lighting installations <br />shall have secondary current ratings not in excess of 30 milliamperes un- <br />less they and all wiring connected to them are installed in accordance with <br />the provisions for electric discharge lighting of the same voltage. <br />3. EXPOSED TO WEATHER. Transformers used out -doors shall be of the <br />weatherproof type or shall be enclosed in a separate metal box. <br />4. TRANSFORMER SECONDARY CONNECTIONS. The high- voltage windings of <br />transformers shall not be connected in parallel; and shall not be connected <br />in series, except that two transformers each having one end of its high - <br />voltage winding connected to the metal enclosure in series to form the <br />equivalent of a midpoint grounded transformer. The grounded ends shall be <br />connected by insulated conductors not smaller than No. 14. <br />5. ACCESSIBILITY. Transformers shall be accessible. <br />(C) TUBING. Electric discharge tubing shall conform to the following; <br />1. DESIGN. The tubing shall be of such length and design as not to cause <br />a continuous over - voltage on the transformer. <br />2. SUPPORT. Tubing shall be adequately supported on non - combustible, non- <br />absorptive supports. Tubing supports should, if practicable, be adjustable. <br />3. CONTACT WITH FLAMMABLE MATERIAL AND OTHER SURFACES. The tubing shall <br />be free from contact with flammable material and shall be located where <br />24 - <br />