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UL Question Corner — PV rapid shutdown inside the array, and...

Question Effective January 1, 2019, the requirements for PV rapid shutdown inside the array boundary went into effect in the 2017 NEC Section 690.12(B)(2). Are...

UL Question Corner — Introducing the UL Product IQ Database

Question I tried accessing UL’s Online Certifications Directory and was redirected to UL Product iQ database requiring registration. Has UL’s Online Certifications Directory been replaced...

UL Question Corner: Low Voltage LED Luminaire Drivers

Q. I have encountered Listed low voltage LED luminaires shipped without a driver. Do I have to use a power supply/driver...

UL Question Corner: Field modifications of UL Certified (Listed) products, tapping...

Q. When a UL Certified (Listed) product leaves the factory, the UL Mark on the product...

Certification requirements for line side connectors

Q. Do wire connectors used to make line side splices or taps need to have a...

UL Question Corner: Installing power monitoring equipment in panelboards

NEC-2017 Section 312.8(B) was added to allow installation of Listed power monitoring equipment inside panelboards. Where can I find power monitoring equipment that is...

UL Question Corner: System combination AFCI’s

 Are there any Certified (Listed) system-combination arc-fault circuit interrupters (AFCIs) for use in accordance with NEC 210.12(A)(4)? How are they identified? Yes. UL does Certify...
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