MIL-R-46837 Raceways, Steel, RigidThis specification covers the requirements for rigid steel raceway conduits which consist of a base and cover so formed as to distinguish raceways from metallic tubular conduits.

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MIL-R-46837B (MI)

TABLE IV. Type IV

Size	Dimensions			Length-Ft		Wire Size	Race Capacity
	x	y	z	Cover	Base	AWG	Type R or RH	Type T or RU
No.21 C Cover	1-1/14	---	0.040	5		14 12	10 4	10 6
No.21 B (Base	1-1/4	7/8	0.040	--	10	12	10	10
No.30 C Cover	2-3/4	---	0.040	10	--
No.30 B	2-3/4	1-7/16	0.040	--	10	14 12 10	10 10 10	10 10 10

Note: Screw Knockouts are provided in base

Figure 4

3.6 Cleaning. The cleaning process shall leave the raceways in a condition such that the protective coating will adhere firmly to all surfaces.

3.7. Finish. Raceways shall be finished with baked enamel on all surfaces to provide protection from corrosion. the composition and application of enamel shall be in accordance with commercial practice.

3.7.1 Enamel coating. The enamel coating shall evenly cover the surface to which it is applied. The enamel coating shall withstand the test requirements specified herein (see 4.2.2.2).

3.7.2 Enamel color. Color of the baked enamel shall be as specified by the ordering data (see 6.2).