Attributes . Nonmetallic construction with metal imbedded grounding grid; No need to install special wires and parts for grounding; Special grounding wire furnished with each box provides safe grounding when cover is removed; Unique labyrinth-path construction assures flame-tight joint between body and cover; Silicone gasket, specially designed for the labyrinth-path joint, prevents entrance of moisture without interfering with the venting of cooled hazardous gases and vapors; High-strength thermoplastic polyetherimide, together with thick walls (5/16 IN) and sound structural design (rounded corners) provides superior resistance to impact and crushing; Excellent resistance to ultraviolet light and water; Excellent conduit connection strength; Excellent resistance to attack by fungi and mold; Explosionproof, with sealing fittings installed at each conduit entrance, the N1 series enclosures withstood a hydrostatic test of four times the maximum internal explosion pressure that could be developed from . Names