UL 1261-2016 pdf download

UL 1261-2016 pdf download.Electric Water Heaters for Pools and Tubs.
30 Abnormal Operation
30.1 When the conditions of normal operation are not representative of abnormal conditions likely to be encountered in actual service, a heater shall be tested to determine whether it could result in a risk of tire. electric shock, or injury to persons when operated under such abnormal conditions.
30.2 To determine if a risk of fire could result, a separate abnormal heating test is to be conducted with the heater operating dry. and with the regulating control shunted. Only the limit control Is to remain as a functioning temperature control device.
30.3 In the condition specified in 30.2. the heater is to be energized until the ultimate result has occurred, but not more than 7 hours,
31 InsulatIon ResIstance as a Result of MoIsture
31.1 A heater using insulation likely to be affected adversely by moisture under conditions of normal use shall be conditioned for 24 hours in air having a relative humidity ot 85 ±5 percent at a temperature of 32 ±2°C (89.6 ±3.6°F), The results are in compliance when, after the conditoning, the heater has an insulation resistance of not less than 50.000 ohms between live and dead-metal parts.
31.2 Insulation resistance is to be measured by means of a voltmeter having an internal resistance of 30.000 ohms, and using a 250-volt direct current.
32 ResIstance to Rain
32.1 A heater intended for outdoor use shall be subjected to the rain test. The maximum resistivity of the water used in the resistance to rain test shall be 2540 ohm-centImeters or minimum conductivity of 3.94
x i0’ Siemen per centimeter (Scm). The results of the test are to be used if the unit:
a) Has an insulation resistance of not less than 50,000 ohms when measured In accordance with Insulation Resistance as a Result of Moisture, Section 31:
b) Complies with a repeated dielectric voltage-withstand test as described In Dielectric Voltage- Withstand. Section 29; and
C) Complies with 32.6.
32.2 The rain test is to be conducted under normal conditions of operation most likely to permit entrance of water into or onto the electrical components. When required, operate the heater under various modes of operation or de-energize it if more adverse conditions result therefrom. In any case, each exposure to the simulated rain is to be for 1 hour. When more than one exposure is required, the unit is to be reconditioned as required so that the results of each test will not be influenced by prior exposures.
32.3 Field-winng connections to the equipment are to be made to represent the intended method of such wiring. An opening at which conduit is to be terminated is to be sealed, but an opening for the entry of a conductor or conductors of a low-voltage circuit is not to be sealed. Water connections are to be made in the intended manner and according to the manufacturer’s instructions.
C) The sample and the test sdution should be kept in the test room long enough to acquire the temperature of the room, which should be noted and recorded. The test is to be conducted at a room temperature of 21,1 — 32.0CC (70— 90°F),
d) Each sample is to be thoroughly cleaned before testing. All grease, lacquer, paint, and other nonmetallic coatings are to be completely removed by means of solvents. Samples are then to be thoroughly rinsed in water and dried with clean cheesecloth. Care is to be taken to avoid contact ot the cleaned surface with the hands or any foreign material.
e) The sample is to be supported from 0,7 to 1 inch (17.8 to 25.4 mm) below the orihce, so that the drops of the solution strike the point to be tested and run oft quickly. The surface to be tested should be inclined about 45 degrees from honzontal.
f) After cleaning, the sample is to be put in place under the orifice. The stopcock is then to be opened and the time in seconds measured with a stop watch until the dropping solution dissolves off the protective metal and exposes the base metal. The end point for timing is the first appearance of the base metal recognizable by the change in color.