Liquidtight conduit is useless with the wrong fitting: NEMA and IP ratings explained

The video walks through how the National Electrical Code sorts locations into dry, damp and wet, what labels such as weatherproof and raintight mean, and how NEMA enclosure types compare with the IP codes of IEC 60529. Its main warning: top-grade liquidtight conduit buys nothing if it ends in a NEMA 1 box or a fitting never rated for water.

NEMA wrote that rule down in Technical Services Bulletin 123. An IP rating on liquidtight flexible metal conduit counts only when the conduit is paired with fittings and an enclosure rated to match, the bulletin says, and the whole system takes the lowest rating of any part. Its example: IP65 conduit run between IP67 fittings, an IP67 breaker box and an IP67 motor makes an IP65 installation.

The two systems do not convert both ways. NEMA 250 also tests for corrosion, icing, oil and coolants, so a NEMA type can be translated into an IP code but an IP code cannot be translated into a NEMA type, according to the bulletin. Types 4 and 4X meet IP65 and IP66, Type 6 adds occasional submersion, and Type 6P adds prolonged submersion and corrosion. NEC Table 110.28 lists each enclosure type and the conditions it handles.

The location call comes before any of that. Under NEC Article 100, a spot under a roofed porch or canopy is damp only if it is protected from the weather. Building Code Geek, a guide written by a retired inspector, says an outlet under a shallow eave that still catches wind-driven rain or runoff gets inspected as wet. The same guide notes that a weatherproof cover does not make the device inside weather resistant: outdoor nonlocking 125- and 250-volt receptacles must be WR-listed under NEC 406.9.