Flexible Metallic Conduit - Electrical Engineering

Flexible Metallic Conduit (FMC) provides alternative where a rigid conduit would be difficult to install due to bending need. The below table of Flexible Metallic Conduit is in line with NEC.

FLEXIBLE METAL CONDUIT (FMC)
Trade Size	Nominal Internal Diameter		Total Area 100%		60%		1 Wire 53%		2 Wires 31%		Over 2 Wires 40%
Trade Size	mm	in.	mm²	in.²	mm²	in.²	mm²	in.²	mm²	in.²	mm²	in.²
⅜	9.7	0.384	74	0.116	44	0.070	39	0.061	23	0.036	30	0.046
½	16.1	0.635	204	0.317	122	0.190	108	0.168	63	0.098	82	0.127
¾	20.9	0.824	343	0.533	206	0.320	182	0.282	106	0.165	137	0.213
1	25.9	1.020	527	0.817	316	0.490	279	0.433	163	0.253	211	0.327
1 ¼	32.4	1.275	824	1.277	494	0.766	437	0.677	255	0.396	330	0.511
1 ½	39.1	1.538	1,201	1.858	721	1.115	637	0.985	372	0.576	480	0.743
2	51.8	2.040	2,107	3.269	1,264	1.961	1,117	1.733	653	1.013	843	1.308
2 ½	63.5	2.500	3,167	4.909	1,900	2.945	1,679	2.602	982	1.522	1,267	1.964
3	76.2	3.000	4,560	7.069	2,736	4.241	2,417	3.747	1,414	2.191	1,824	2.828
3 ½	88.9	3.500	6,207	9.621	3,724	5.773	3,290	5.099	1,924	2.983	2,483	3.848
4	101.6	4.000	8,107	12.566	4,864	7.540	4,297	6.660	2,513	3.895	3,243	5.026

Conduit is able to contain an allowable fill percent. Hence, a conduit fill calculation is provide here.