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If you’re specifying building wire under UL 44​ and NEC Table 310.15, you’ve likely encountered the XHH family: XHH, XHHW, and XHHW-2. They look similar on a quote — all use XLPE (cross-linked polyethylene)​ insulation, no PVC jacket, 600V (with 1 kV common for photovoltaic feeders) — but the three-letter suffixes decide whether your run […]

When specifying building wire for North American commercial or industrial projects, three common UL44 types often cause confusion: RHH, RHW, and RHW-2. They share the same basic construction — stranded copper or aluminum conductor with EPR (ethylene propylene rubber) or XLPE (cross-linked polyethylene) insulation, no PVC jacket, rated 600V (also available 1000V/2000V) — but differ […]

When selecting building wire for Canadian electrical installations, understanding the distinction between T90​ and R90​ is essential. Both are rated 90°C and comply with Canadian Standards Association (CSA) requirements, yet they serve fundamentally different applications due to their insulation materials and structural design. This article provides a detailed side-by-side comparison of T90 and R90, covering […]

When planning an electrical installation, one of the most critical decisions you will make is selecting the right conductor material for your THHN wire. While both copper and aluminum AA8000 series THHN wires share the same robust outer construction—PVC insulation with a nylon jacket, rated for 600V and 90°C in dry locations—their internal differences are […]

Choosing the right photovoltaic (PV) cable is critical for the long-term safety, efficiency, and reliability of any solar installation. Two popular alternatives to pure copper cables are aluminum alloy (PV-AL)​ and tinned copper clad aluminum (TCCA)​ cables. While both offer cost savings over solid copper, they differ significantly in material composition, electrical performance, corrosion resistance, […]