UL has created two new wind turbine certification product categories, Wind Turbine Drive-train Systems and Equipment (ZGDT) and Wind Turbine Tower Assemblies (ZGTA)

UL does certify PV module trackers under the product category Photovoltaic Solar Trackers (QIKA)

Let's look at the location for the grounding termination of the many electronic systems that currently occupy our households, and how the requirements have evolved and how the industry has grown to meet the challenges.