NMD90 vs. NM-B: What’s the Difference? A Guide to Building Wire in Canada and the U.S.
If you work with building wire in North America, you’ve likely encountered both NM-B and NMD90. On the surface, they look almost identical—copper conductors, PVC/nylon insulation, a flame-retardant PVC jacket, and a 90°C temperature marking. But in practice, they belong to two different regulatory systems and are not interchangeable. If you’re looking for the right […]