UL 60947-7-2 standard pdf

23 Gasoline Submersible Motors

23.1 General

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 Lubrication

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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UL 1058 Download

샴샴샀샀샀샀샀샀샴샴ෳഊഊഊഊ�낱꺧릷겸��촠뾬벲꺿궼껐ꪱ벷벻븠₧�늫뮼₮랴뮽궲₻랩뢬��ഠഊഊ퐊붷늻뮭뇞랻릲쬠뮭뎨⃴뾩릲਍਍뇒긠낻놮ꮼ경놷₲꺱눠겻놩떮늷₹뮰뎮겷뮬₼랩뢬ꮱ€랴뮽궲₻꺺뎱휠췘਍਍਍뇒€놺₮믎뾭뮴⃴⃨�෌ഊ�
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UL 636 Download

© Canadian Standards Association

This plate may be lightly lubricated in order to help removal before testing. Care shall be exercised in order to make sure that inserts are not damaged during placement of reinforcement or pouring of the plastic concrete.

7.1.3 Inserts in an unformed surface (floating)

When there is no form on the surface to be tested, inserts shall be installed in plastic concrete. The insert shall be installed in such a way that the cylindrical head penetrates the concrete laterally, with a circular motion. A smooth metal plate with holes, as shown in Figure 5, shall be attached at the end of the insert’s shaft to allow it to “float” on the surface and to ensure a smooth bearing surface that is free of air voids. The shaft shall then be inclined about 10° from a right angle to the surface to prevent air bubbles under the plate. An internal vibrator shall be inserted under the insert in order to achieve a good embedment of the insert. The plate shall then be cleaned of any accumulation of concrete over its surface in order to allow for easy removal at time of testing. All necessary precautions shall be taken to ensure that finishing operations do not damage inserts or the surrounding concrete.

7.2 Loading

Before loading, hardware necessary to the installation of inserts shall be removed (i.e., bolt, smooth metal plate, and shaft). The bearing surface of the concrete shall be smooth and free of loose particles and dust. The loading apparatus shall be connected to the insert by means of the appropriate mechanisms and centered on the insert in order to ensure that the load is axial and uniform over the bearing ring. The load shall be applied at a uniform rate of 500 N/s ± 50 N/s for the total time of the pullout test.

7.3 Test to failure

Loading shall be applied until failure of the concrete cone (i.e., until maximum load is reached). The maximum load shall be recorded to the nearest 0.5 kN.

Note: In order to minimize damage to the concrete surface, the cracked cone of concrete may be left in place. In the case of doubt about a result, the concrete cone should be extracted completely in order to observe and report potential defects, such as a bad embedding of the insert or the presence of other embedded items in the failure zone of the insert.

7.4 Testing to a predetermined strength level

The load shall be increased to the maximum predetermined force. If failure does not occur, the load shall be maintained for at least 10 s. In a case where failure occurs, the maximum load shall be recorded, in kN, and further testing shall be delayed to a later time.

7.5 Testing period

All inserts used for one strength test at a given age shall be tested within a maximum period of 90 min.

8 Correlation between pullout strength and compressive strength of standard cylinders

The correlation between pullout strength and compressive strength of standard cylinders can vary with aggregate type and with the specified strength of the concrete mix. Unless correlation data are available, a correlation curve shall be established for each type of concrete mix and specified level of strength.

The correlation curve is established based on tests with standard 150 mm × 300 mm cylinders in which inserts are attached to the centre of the base (see Figure 6) or 200 mm cubes in which inserts are attached to the centre of the cubes’ faces. At various test ages, pullout strength tests shall be carried out until maximum load is reached (i.e., tested to failure). When cylinders are used, care shall be taken not to extract the cracked cone from the bottom of the cylinder. The cone shall be slightly hammered in order to reduce the surface depression. The cylinder shall then be immediately capped with an appropriate capping compound, allowing compressive strength tests to be made within 30 min. Concrete for fabrication of cylinder specimens shall be sampled in accordance with CSA A23.2-1C. Fabrication cylinder

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Test methods and standard practices for concrete

15C

[03bc]

July 2009

515

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UL 125

FEBRUARY 2, 2009

53.3 The walls, floor, and ceiling of the enclosure are to be made of 1-inch trade size wood boards (3/4 inch thick) or 3/4-inch (19.1-mm) thick plywood. The walls are to be vertical and at right angles. The interior surfaces of the walls, floor, and ceiling are to be finished in flat black. All joints in the enclosure are to be sealed.

53.4 For alcove installation test, the enclosure is to be three-sided, leaving the front side of the appliance casing exposed. Any remaining opening around the casing from side to side and from floor to ceiling is to be closed with 3/4-inch (19.1 mm) plywood if the appliance is not provided with a frame or panel for this purpose. The side walls are to terminate flush with the front of the appliance, and a wall is to be placed opposite the open side of the enclosure at a distance of 18 or 24 inches (467 or 610 mm), as specified by the manufacturer for testing purposes. If it is evaluated that such an installation may create higher temperatures at some locations, an appliance may also be tested with one side wall of the enclosure extended 18 inches (457 mm) beyond the front of the appliance, in which case there is to be no wall placed opposite the front of the appliance.

53.5 For closet installation test, a simulated door is to be provided for the enclosure. Such door is to be made of 3/4-inch (19.1-mm) thick plywood, the interior surfaces of which are to be finished in flat black. If the door is to be provided with openings, they are to be placed at locations with respect to the appliance in accordance with the manufacturer�s installation instructions.

53.6 For a downflow appliance, a structure made of nominal 1-inch trade size lumber (3/4 inch thick) or 3/4-inch (19.1-mm) plywood representing a floor and joist structure is to be placed around the warm-air outlet plenum and duct. The clearance between the plenum and duct and the enclosure is to be 0 or 1/4, 1/2, 3/4, or 1 inch (6.4, 12.7, 19.1, or 25.4 mm), as specified by the manufacturer. The structure is to extend the full length of the duct. See Figure 53.2.

53.7 The room temperature is to be measured by a thermocouple not larger than 24 AWG (0.21 mm2), suitably shielded from direct radiation. For alcove installation, the thermocouple is to be placed centrally 15 inches (381 mm) in front of the appliance and 24 inches (610 mm) above the floor of the test enclosure, except that for a horizontal heating appliance, the thermocouple is to be located midway between the floor and ceiling of the test enclosure. For closet installation, the thermocouple is to be placed in the center of the lower ventilating opening into the closet when the manufacturer�s instructions recommend that such openings be provided; otherwise the thermocouple is to be placed as specified above for alcove installation.

53.7 revised February 2, 2009

53.8 The appliance is to be level. Leveling means, when provided, are to be removed if detachable; or, if not detachable, are to be adjusted to place the base of the appliance the minimum allowable distance above the floor.

UL COPYRIGHTED MATERIAL �

NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL

UL 307B

93

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