UL 2577-2013 pdf download
UL 2577-2013 pdf download.Suspended Ceiling Grid Low Voltage Systems and Equipment.
25.2 Test setup — grid rail system
25,2.1 The grid rail bus bars with the maximum length of grid rails and maximum number of connectors shall be connected and assembled as specified in the installation instructions, with a power feed connector and at least one load connector positioned at the maximum distance from the power supply connector allowed by the constwction. The load connector shall be connected to a representative low voltage equipment load (see 25.3.2), with additional resistive loads it necessary, and adjusted to draw the maximum rated current of the connector through the system.
25.2.2 If more than one connector is required to load the system to rated current multiple connectors are to be positioned adjacent to each other at the maximum distance from the power source. A connector that uses a crimp or spnng type contact to retain the conductor shall be tested with the minimum and maximum wire size intended to be used with the connector.
25.3 Test setup — power supplies and low voltage equipment
25.3.1 The Class 2 power supply should be mounted in accordance with the manufacturer’s instructions and connected to rated supply voltage. The output of the power supply should be connected to the grid rail system as noted in 25,2.
25.3.2 The Class 2 low voltage equipment shall be mounted in accordance with manufacturer’s instructions and connected to the grid rail system as noted in 25.2. It the low voltage equipment is adjustable, it should be positioned to cause the highest temperature on the low voltage equipment and then repositioned to cause the highest temperatures on the grid rail system. mounting surface, or both.
26 Mechanical Assembly Load Test
26.1 A connector, grid rail or other component part used to support low voltage equipment shall be subjected to the load tests as specified in 26.2 and 26.3. Compliance criteria are described in 26.4.
26.2 The load connector is to be mounted to an individual grid rail in accordance with the installation instructions at the maximum support spacing. If there is a point in the grid rail that is less reinforced than at other points, the connector shall be positioned at that point. A connector shall be tested with each conductor size intended to support the low voltage equipment weight. A weight equal to two times the weight of the heaviest low voltage equipment assembly, but no less than 4.5 kg (10 Ibs), is to be suspended from the load connector for 1 h.
26.3 If the adjoining grid system is needed to stabilize the grid and to reduce the twisting. the ceiling grid for 26.2 may consist of not less than 3 maximum length parallel powered grid rails and the maximum length and maximum spaced interconnecting cross members.
26.4 Test results are acceptable if the grid rail or connector is not deformed in a manner that would:
a) Allow the release of the low voltage equipment from the grid rail, or
b) Affect compliance with Electrical Spacings, Section 17. 27 Moment Test
27.1 A load connector that supports low voltage equipment for which the center of gravity is not located directly vertically below the grid rail load connector is to be subjected to the test described in 27.2 — 27.4 and shall comply with the test results in 27.5.
272 A representative assembly of the suspended ceiling grid system shall be installed in accordance with
the installation instructions at the maximum support spacing. The ceiling grid shall consist of not less than
3 parallel maximum length powered grid rails and maximum length and maximum spaced interconnecting
cross members
273 The load connector and stem, low voltage equipment. or other rigid object (for example, a luminaire head and stem) of a length equal to the maximum length of stem intended to be provided on the load connector are to be Installed as intended on the grid rail.
27.4 The maximum weight that the assembly is intended to support is to be applied to the end of the stem farthest from the grid rail and parallel to the plane of the grid rail ceiling grid surface for 1 h. The stem may be positioned in any orientation determined to be most severe but shall be at least positioned as follows.
