Steel RMC has the thickest-wall of the steel raceways. It is available with either a straight-tapped or integral coupling. Galvanized Steel RMC may have a primary coating of zinc on the exterior and interior of the conduit; a combination of zinc and nonmetallic coating are also permitted. Supplementary coatings can be applied for additional corrosion protection.

Electrical Code Compliance

The National Electrical Code^® Article 344 covers rigid metal conduit, which includes galvanized and stainless steel, aluminum and red brass. Steel RMC is permitted in all atmospheric conditions and occupancies. The listing label for this product will be identified with one of the following: “Electrical Rigid Metal Conduit” or “ERMC-S”.

RMC Trade Sizes

RMC is available in trade sizes 1/2 through 6, and 10′ and 20′ lengths. RMC is threaded on both ends, with a coupling applied to one and a color-coded thread protector on the other. The industry-established color-coded thread protectors aid in product and trade size recognition. Thread protectors for trade sizes 1, 2, 3, 4, 5 and 6 are color coded blue; trade sizes 1/2, 1 1/2, 2 1/2 and 3 1/2 are black; and trade sizes 3/4 and 1 1/4 are red.

Steel RMC Corrosion Protection

A variety of coating options are available to protect galvanized steel RMC against corrosion. ERMC-S is provided with zinc, zinc-based, nonmetallic, or other alternate corrosion-resistant exterior coating and an organic or zinc interior coating.

												Master Bundles
Trade Size Designator		Nominal Wt. per 100 Ft. (30.5m.)		Nominal Outside Diameter		Nominal Wall Thickness		Quantity in Primary Bundle		Quantity		Approx Wt.		Volume
US	Metric	lb.	kg	in.	mm	in.	mm	ft.	m	ft.	mm	lb.	kg	cu ft.	cu m
1/2	16	82	37.2	0.840	21.3	0.104	2.60	100	30.5	2500	762.5	2050	929.7	20.8	0.59
3/4	21	109	49.4	1.050	26.7	0.107	2.70	50	15.2	2000	610.0	2180	988.7	24.3	0.69
1	27	119	73.0	1.315	33.4	0.126	3.20	50	15.2	1250	381.3	2013	912.9	27.7	0.61
1 1/4	35	218	98.9	1.660	42.2	0.133	3.40	-	-	900	274.5	1962	889.8	23.3	0.66
1 1/2	41	263	119.3	1.900	48.3	0.138	3.50	-	-	800	244.0	2104	954.2	27.8	0.79
2	53	350	157.7	2.375	60.3	0.146	3.70	-	-	600	183.0	2100	952.4	33.8	0.96
2 1/2	63	559	253.5	2.875	73	0.193	4.90	-	-	370	112.9	2068	937.9	29.2	0.83
3	78	727	329.7	3.5000	88.9	0.205	5.20	-	-	300	91.5	2181	989.1	31.3	0.89
3 1/2	91	880	399.1	4.000	101.6	0.215	5.50	-	-	250	76.3	2200	997.7	34.7	0.98
4	103	1030	467.1	4.5000	116.3	0.225	5.70	-	-	200	61.0	2060	934.2	33.7	0.95
5	129	1400	634.9	5.563	141.3	0.245	6.20	-	-	150	45.8	2100	952.4	41.3	1.17
6	155	1840	834.5	6.625	168.3	0.266	6.80	-	-	100	30.5	1840	834.5	389.1	1.10