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NMD90 is common house wire. It is designed for use indoors, in dry locations, and away from the weather. It must NOT be buried or used in wet locations. The slight dampness found in some basements will not hurt it. A bare copper bonding (ground) wire is always included to permit safe operation of attached equipment. The plastic covering is not designed for installation at low temperatures, and it is good practice to warm the spools before unrolling the wire in winter. NMD90 always contains a white NEUTRAL wire, except for NMD (Red) HEATEX.