KBG, JDG, and SC are three Chinese galvanized conduit classifications that overseas buyers frequently see on quotations but rarely recognize, each built around a different wall thickness and connection method rather than being interchangeable grades of the same product. This guide explains what each type is designed for — KBG for concrete-embedded installation, JDG for serviceable surface-mounted wiring, and SC for heavy-duty threaded outdoor runs — and maps each to the closest international equivalent (EMT, IMC, RMC) buyers already know, helping procurement teams specify the right conduit type and avoid a connection-method mismatch discovered only after the shipment arrives.

UL 2703, IEC 62817 and ASCE 7 address three different compliance questions for solar mounting systems — electrical grounding/fire classification, mechanical design qualification, and site-specific wind/snow load calculation. This guide explains what each standard actually verifies, which documentation buyers should request for North American versus international projects, and why passing one certification doesn't automatically satisfy the other two — helping EPC contractors and procurement teams request complete, site-accurate compliance documentation from their mounting system supplier.

NEMA VE 1 and IEC 61537 cover metal cable tray, while UL 568 covers non-metallic (FRP) tray. Compare their scope, load rating methods and safety factors, and learn which standard to specify for your project.