UL 864: Control Units and Accessories for Fire Alarm Systems

16.1 Twelve samples of a capacitor are to be tested as described in 16.2 and 16.3. As a result of the tests, there shall not be permanent breakdown or flashover. 16.2 Each capacitor is to be mounted by the leads in a fixed position with the capacitors randomly oriented in any end-use configuration not prohibited by the physical construction of the capacitor. The free length of the leads is to be at least 1 in (25.4 mm) unless the samples are provided with shorter leads. 16.3 Each individual capacitor is to be subjected to a maximum of 24 impulses of the same polarity. The time between impulses shall not be less than 10 s. 16.4 The peak value of the impulse voltage (Vp) is to be 4 kVdc for Class X1 capacitors. 16.5 The peak value of the impulse voltage (Vp) is to be 8 kVdc for Class Y1 capacitors. 16.6 The peak value of the impulse voltage (Vp) is to be 5 kVdc for Class Y2 capacitors. 16.7 When any three successive impulses are shown by the oscilloscope to have a waveform indicating that no self-healing breakdowns or flashovers have taken place in the capacitor, no further impulses are to be applied, and the capacitor complies with the requirement. When all 24 impulses have been applied to the capacitor, and three or more of the waveforms indicate that no self-healing or flashovers have occurred, the capacitor complies with the requirement. When less than three waveforms are of the required waveform, the capacitor does not comply with the requirement. Exception: When the waveform has a dampened oscillation, the peak-to-peak voltage (VPP) of the oscillation shall not be greater than 10 percent of the peak voltage (VP) of the impulse. 16.8 The waveform is to be determined by the circuit components in the test circuit. Figure 16.2 illustrates the circuit to be used in performing this test. The parameters of the components in the test circuit are to be in accordance with Table 16.1.

UL's safety and performance standard for Surge Protective Devices (SPD), formerly known as Transient Voltage Surge Suppressors (TVSS), is UL 1449. This standard applies to end-users, manufacturers, and specifiers. As a generalization, UL addresses electrical product safety in areas that involve a risk of fire, electric shock, or injury to persons. UL verifies the safe operation of SPDs through a listing or component recognition process including a series of stringent destructive and non-destructive tests. These ensure safe operation during normal operation and at the unit's end of life. End-of-life characteristics are particularly important because SPDs are placed in harm’s way and can affect the rest of the electrical distribution system. Areas of interest include fault current testing, thermal issues, touch-safety, etc. Nationally Recognized Testing Laboratories (NRTLs – such as UL, CSA, Intertek, MET Labs, etc.) provide a valuable service to specifiers and end-users by testing the performance of all SPDs the same way. This is the only ‘common’ testing format in the industry, making it an important barometer of performance. Retrieved from Nemasurge 11-14-2013

1.1 These requirements cover flat-plate photovoltaic modules and panels intended for installation on or integral with buildings, or to be freestanding (that is, not attached to buildings), in accordance with the National Electrical Code, NFPA 70, and Model Building Codes. 1.2 These requirements cover modules and panels intended for use in systems with a maximum system voltage of 1000 V or less. 1.3 These requirements also cover components intended to provide electrical connection to and mounting facilities for flat-plate photovoltaic modules and panels. 1.4 These requirements do not cover: a) Equipment intended to accept the electrical output from the array, such as power conditioning units (inverters) and batteries; b) Any tracking mechanism; c) Cell assemblies intended to operate under concentrated sunlight; d) Optical concentrators; or e) Combination photovoltaic-thermal modules or panels.  

UL1741 is an inverter testing standard from the UL global safety science organization that aims to ensure power system performance and grid support functionality.  1.1 The UL1741 inverter testing requirements cover inverters, converters, charge controllers, and interconnection system equipment (ISE) intended for use in stand-alone (not grid-connected) or utility-interactive (grid-connected) power systems. Utility-interactive inverters, converters, and ISE are intended to be operated in parallel with an electric power system (EPS) to supply power to common loads. 1.2 For utility-interactive equipment, the UL1741 inverter testing requirements are intended to supplement and be used in conjunction with the Standard for Interconnecting Distributed Resources With Electric Power Systems, IEEE 1547, and the Standard for Conformance Test Procedures for Equipment Interconnecting Distributed Resources with Electric Power Systems, IEEE 1547.1. 1.3 The UL1741 inverter testing requirements cover AC modules that combine flat-plate photovoltaic modules and inverters to provide AC output power for stand-alone use or utility interaction, and power systems that combine other alternative energy sources with inverters, converters, charge controllers, and interconnection system equipment (ISE), in system specific combinations. 1.4 The UL1741 inverter testing requirements also cover power systems that combine independent power sources with inverters, converters, charge controllers, and interconnection system equipment (ISE) in system-specific combinations. 1.5 The products covered by the UL1741 inverter testing requirements are intended to be installed in accordance with the National Electrical Code, NFPA 70. User-defined waveforms permit the generation of non-sinusoidal voltages: asymmetrical inflections, transient anomalies, voltage harmonics Equipment for Inverter Testing ​Grid Simulators are the most common equipment for UL1741

UL508A is the standard for the construction of Industrial Control Panels. This document gives guidelines to panel builders on various issues including proper component selection, wiring methods and calculation of short circuit current ratings. If a customer follows UL508A's construction requirements and recommendations, they can apply to have their panel listed by UL. Upon successful inspection, the panel would bear the UL label. A UL label signifies that the panel builder has met the requirements of UL508A, and that their panels are subject to inspection by UL field representatives. Not every panel is inspected by UL, but panels are subject to inspection by UL depending upon the quantity of UL Labeled panels made in a give time period. A UL Follow Up Services representative inspects the facility and reviews the panels to the UL508A procedure for the particular panel shop being inspected. If the panels are found to comply, they are permitted to continue production and apply the UL Label.  

1.1.1 Equipment covered by this standard This standard is applicable to mains-powered or battery-powered information technology equipment, including electrical business equipment and associated equipment, with a RATED VOLTAGE not exceeding 600 V and designed to be installed in accordance with the Canadian Electrical Code, Part I, CSA C22.1; CSA C22.2 No. 0; and the National Electrical Code, NFPA 70. The standard is also applicable to equipment, unless otherwise identified by a marking or instructions, designed to be installed in accordance with Article 645 of the National Electrical Code, NFPA 70, and the Standard for the Protection of Electronic Computer Data-Processing Equipment, NFPA 75. This standard is also applicable to such information technology equipment designed and intended to be connected directly to a TELECOMMUNICATION NETWORK, regardless of the source of power. It is also applicable to such information technology equipment designed to use the AC MAINS SUPPLY as a telecommunication transmission medium (see note 4 of clause 6). This standard specifies requirements intended to reduce risks of fire, electric shock or injury for the OPERATOR and layman who may come into contact with the equipment and, where specifically stated, for SERVICE PERSONNEL. This standard is intended to reduce such risks with respect to installed equipment, whether it consists of a system of interconnected units or independent units, subject to installing, operating and maintaining the equipment in the manner prescribed by the manufacturer. 1.1.2 Additional requirements Requirements additional to those specified in this standard may be necessary for:   equipment intended for operation in special environments, for example, extremes of temperature; excessive dust, moisture or vibration; flammable gases; and corrosive or explosive atmospheres; electromedical applications with physical connections to the patient; equipment intended to be used in

This International Standard applies to electronic apparatus designed to be fed from the MAINS or from a SUPPLY APPARATUS and intended for reception, generation, recording or reproduction respectively of audio, video and associated signals. It also applies to apparatus designed to be used exclusively in combination with the above mentioned apparatus. This standard concerns only safety aspects of the above apparatus; it does not concern other matters, such as style or performance. For above-mentioned apparatus, which are fed from a supply source other than the MAINS or from a SUPPLY APPARATUS, and which contain a LASER SYSTEM or produce an internal OPERATING VOLTAGE greater than 4000 V (peak), this standard applies as far as applicable. NOTE 1 - In Australia, Canada, Denmark, Japan, Rumania, South Africa, United States of America and United Kingdom this standard is, where relevant, used as a guide for the testing of battery operated apparatus. This standard applies to the above-mentioned apparatus, if it is designed to be connected to the TELECOMMUNICATION NETWORK or similar network, for example by means of an integrated modem. This standard applies to apparatus for use at altitudes not exceeding 2000 m above sea level, primarily in dry locations and in regions with moderate or tropical climates. For apparatus with protection against splashing water intended for outdoor use, additional requirements are given in annex a. For apparatus to be connected to TELECOMMUNICATION NETWORKS, additional requirements are given in annex b. For apparatus intended to be used in vehicles, ships or aircraft, or at altitudes exceeding 2000 m above sea level, additional requirements may be necessary. Requirements, additional to those specified in this standard, may be necessary for apparatus intended for special conditions of use. Retrieved from UL.com on 11-15-2013

UL 943 covers ground-fault circuit-interrupters intended for use only in alternating-current circuits wherein one of the wires is grounded in accordance with the National Electrical Code. Devices complying to UL 943 are intended for use on 120 Vac or 120/240 Vac, 60 Hz circuits. These requirements do not cover ground-fault circuit-interrupters intended for use in circuits served by a transformer having windings wholly insulated from each other. A ground-fault circuit-interrupter as covered by these requirements is a device whose function is to interrupt the electric circuit to the load when a fault current to ground exceeds some predetermined value that is less than that required to operate the overcurrent protective device of the supply circuit. UL 943 provides requirements for ground-fault circuit-interrupters for use in accordance with the electrical installation codes of Canada, Mexico, and the United States. At present there is no IEC Standard for ground-fault circuit-interrupters for use in accordance with these codes. Therefore, this Standard does not employ any IEC Standard for base requirements.