UL 1053-2015 pdf download
UL 1053-2015 pdf download.Ground-Fault Sensing and Relaying Equipment.
16 Wiring Space
16.1 The space within the enclosure of ground-fault current sensing and relaying equipment shall provide ample room for the distribution of wires and cables required for the proper wiring of the device.
16.2 The wiring space shall be tree of sharp edges, burrs, fins, moving parts, or the like mat can damage conductor insulation.
17 Reset
17.1 Immediately after operation in response to a ground fault, ground-fault current sensing and relaying equipment shall:
a) Be In full functional status so as to be capable of initiating opening of the disconnect device upon sensrng of a ground fault if the disconnect device is reclosed. or
b) Incorporate a reset function as indicated in 17.2.
17.2 If the design of ground-fault current sensing and relaying equipment is such that a reset operation is required to restore me equipment to functional status following operation due to a ground fault or test:
a) The design shall be such as to prevent closing and maintaining contact of the disconnect device to be controlled by the ground•fault current sensing and relaying equipment until the reset operation is performed. or
b) The installation instructions furnished with the ground-fault current sensing and relaying equipment shall clearly indicate that such means shall be Incorporated in the disconnect device.
PERFORMANCE
18 General
18.1 Performance of ground-fault current sensing and relaying equipment shall be investigated by subjecting representative devices to the tests described in Sections 19 — 30, except that the same representative device shall be subjected to all of the tests in Calibration Test. Section 22.
21.2 The equipment shall be connected to a rated source of voltage. it intended to be so connected, and with normal load connected to the output, the equipment shall be energized until constant temperatures are attained under the following conditions:
a) The pid-up setting shall be set to maximum current and time, if adjustable.
b) Simulated ground-fault currents shall be appêied to the sensor. The value of the applied current shall be equal to 90 percent of the tnp-setting employed, provided that the value of applied current need not exceed the pick-up current.
21.3 The load referred to In 21.2 may be omitted It the nature of the circuit is such that no current flows through the load prior to tripping.
21.4 The ten’erature test may be conducted at any ambient temperature within the range of 10 — 40CC
(50 — 104°F). The ambient temperature may be determined using either thermometers or thermocouples
placed in the vicinity of the equipment being tested.
21.5 The acceptability of insulating materials, othec than those listed in Table 21.1. is to be determined with respect to properties such as flammability, arc-resistance, and the like, based on an operating temperature rise plus 40CC (104°F).
21.6 For tests, thermai equilibrium is to be considered to exist when three successive readings, taken at intervals of 10 percent of the previously elapsed duration of the test, but not less than 10 minute intervals, indicate no change.
21.7 Temperatures are to be measured by thermocouples consisting of wires not larger than 24 AWG (0.21 mm2) and not smaller than 30 AWG (0.05 mm2). except that a coil temperature may be determined by the change-of-resistance method. When thermocouples are used in determining temperatures, it is standard practice to employ thermocouples consisting of 30 AWG (0.05 mm2) iron and conslantan wire and a potentiometer-type instrument. Such equipment is to be used whenever referee temperature measurements by thermocouples are necessary. The thermocouple wire is to conform with the requirements specified in the Tolerances on Initial Values of EMF versus Temperature tables in the Standard Specification and Temperature-Electromotive Force (emf) Tables for Standardized Thermocouples, ANSLASTM E23(kE230M.
21.8 A thermocouple junction and adjacent thermocouple lead wire are to be securely held in good thermal contact with the surface of the material whose temperature is being measured. In most cases, adequate thermal contact will result from securely taping o cementing the thermocouple in place but, if a metal surface Is involved, brazing or soldering the thermocouple to the metal may be necessary.
