23 Gasoline Submersible Motors
23.1.1 (I) A gasoline submersible motor shall comply with all the requirements given for motors for Class I, Group D locations in this standard.
23.2.1 (I) For a gasoline submersible motor lubricated by the surrounding product, the end turns of the windings shall be protected with potting compound or shall be sealed from the product.
23.3 Mechanical seal
23.3.1 (I) A mechanical seal construction conforming to the requirements in the Gasoline-Leakage Test, Clause 45, shall be provided at the lead-wire outlet, in addition to the lead seal requirements for motors for Class I locations given in this standard.
24 Leakage Detectors
24.1 Submersible sewage-pump motor
24.1.1 (I) A submersible sewage-pump motor shall be provided with a means of detecting the entrance of water into the enclosure. Instructions for making connections to the leakage-detection circuit shall be provided. There shall be a ready means for periodically testing the operation of the complete circuit, including the wiring to the leakage detectors inside the motor.
24.2 Cord-connected submersible sewage-pump motor
24.2.1 (I) A cord-connected submersible sewage-pump motor may utilize the equipment grounding conductor in the flexible cord as a return path for the leakage-detection circuit, if all of the following conditions are met:
a) The leakage-detection circuit is supplied by an isolating transformer;
b) The leakage-detection open-circuit voltage is 30 V rms, 60 V peak, 60 V dc or less;
c) The circuit current is 0.5 milliampere or less; and
d) The motor is permanently marked with the open-circuit voltage and current ratings of the leakage-detection circuit, and with an indication that the circuit must be an isolated-secondary circuit.
25 Maximum External Surface Temperatures
25.1 (I, II) During the normal and overload operating temperature tests, the exterior surface of a motor shall not exceed the marked operating temperature or temperature class (T-code) in Table 40. See Item
(o) of 51.1.
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