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UL 67-2019 pdf free download
UL 67-2019 pdf free download.Panelboards.
15 Ground-Fault Protection
15.1 A panelboard marked for use as service equipment for 3-phase. 4-wire solidly grounded wye-connected services rated in excess of 150 volts to ground. but not exceeding 1000 volts phase-to-phase, shall be provided with ground-tault protection for each service disconnecting means rated 1000 amperes or more. The ground-fault sensing and relaying equipment provided shall operate to cause the service disconnecting means to open all ungrounded conductors of the faulted circuit. The maximum setting of the ground-fault protection shall be 1200 amperes.
Exception No. 1: If each service disconnecting means rated 1000 amperes or more is provided with a shunt trip that is acceptable for use with ground-fault protection, the ground-fault sensors or relaying equipment or both may be in a separate enclosure it the combination has been found acceptable and the panelboard is marked as required by 34. 10.5.
Exception No. 2: Ground-fault protectiOn need not be provided for a panelboard marked in accordance with 34.10.1.
15.2 Compliance with the requirements specified in 15.1 anticipates that each service disconnect device to which the requirement applies is provided with automatic tripping means for actuation by ground-fault sensing and relaying equipment that may. although not required, be a part of the service disconnect device.
15.3 Ground-fault sensing and relaying equipment that is not a part of the disconnect device shall be mounted in the parielboard enclosure and be connected to the disconnect device and power source, if any. The rating of the disconnect device control circuit shall be compatible with that of the sensing and relaying components.
Exception; As provided in Exception No 1 to 15.1.
15.4 If ground-fault protection is provided, though not required by 15.1, it shall comply with the
requirements for the installation of ground-fault protection equipment as specified in these requirements.
15.5 A ground-fault-protection system described as a zero-sequence type that employs a sensing element that encircles the neutral conductor, if any, and all ungrounded conductors of the protected circuit shall be installed in such a manner that the sensing element is located on the load side of any grounding or bonding connection to the neutral. It may be on the line or load connection to the neutral. It may be on the line or load side of the disconnecting device for the protected circuit.
15.6 A ground-fault-protection system described as the residual type that combines the outputs of separate sensing elements for the neutral, it any. and each ungrounded conductor shall be installed in such a manner that the neutral sensing element is located on the load side of any grounding or bonding connection to the neutral. The ungrounded conductor sensors may be on the line or load side of the disconnecting device for the protected circuits.UL 67-2019 pdf free download.
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