UL 1449 Standard for Surge Protective Devices Revised

UL has announced the release of a new edition of UL 1449UL 1449 applies to Surge Protective Devices (SPDs) designed for repeated limiting of TransientA high amplitude, short-duration sound at the beginning of a waveform that occurs in phenomena such as musical sounds, noises or speech.">transient voltage surges as specified in the standard on 50 or 60 Hertz [Hz]The number of cycles per second of a periodic phenomenon.">Hz power circuits not exceeding 1000 V." class="glossaryLink cmtt_Safety Standards">UL 1449. UL 1449 applies to “surge protective devices.” The revised edition can be purchased on UL’s website.

Description*

“These requirements cover Surge Protective Devices (SPDs) designed for repeated limiting of TransientA high amplitude, short-duration sound at the beginning of a waveform that occurs in phenomena such as musical sounds, noises or speech." class="glossaryLink cmtt_TechTerms">transient voltage surges as specified in the standard on 50 or 60 Hertz [Hz]The number of cycles per second of a periodic phenomenon." class="glossaryLink cmtt_TechTerms">Hz power circuits not exceeding 1000 V and designated as follows:

Type 1 – Permanently connected SPDs intended for installation between the secondary of the service TransformerA static electrical device that transfers energy by inductive coupling between its winding circuits." class="glossaryLink cmtt_TechTerms">transformer and the line side of the service equipment overcurrent device, as well as the load side, including WattDerived unit of power. defined as one joule per second, measures the rate of energy conversion or transfer." class="glossaryLink cmtt_TechTerms">watt-hour meter socket enclosures and Molded Case SPDs intended to be installed without an external overcurrent protective device.

Type 2 – Permanently connected SPDs intended for installation on the load side of the service equipment overcurrent device; including SPDs located at the branch panel and Molded Case SPDs.

Type 3 – Point of utilization SPDs, installed at a minimum conductor length of 10 meters (30 feet) from the electrical service panel to the point of utilization, for example cord connected, direct plug-in, receptacle type and SPDs installed at the utilization equipment being protected. See marking in 80.3. The distance (10 meters) is exclusive of conductors provided with or used to attach SPDs.

Type 4 Component Assemblies – Component assembly consisting of one or more Type 5 components together with a disconnect (integral or external) or a means of complying with the limited current tests in 44.4.

Type 1, 2, 3 Component Assemblies – Consists of a Type 4 component assembly with internal or external short circuit protection.

Type 5 – Discrete component surge suppressors, such as MOVs that may be mounted on a PWB, connected by its leads or provided within an enclosure with mounting means and wiring terminations.”

*Description from the UL website.

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