How Many Wires Can You Put In A Conduit

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Greg's Rule:  Never fill a pipe with more wires than it will hold!   or Only fill a pipe to just about 3/4 full.   Then there is ...   The Maximum Number of Conductors in Trade Sizes of Conduit according to the National Electrical Code (Tables 3A, 3B and 3C)  

Type	SIZE		1/2	3/4	1	1 1/4	1 1/2	2	2 1/2	3	3 1/2	4	5	6
TW	14	AWG	9	15	25	44	60	99	142
TW	12	AWG	7	12	19	35	47	78	111	171
TW	10	AWG	5	9	15	26	36	60	85	131	176
TW	8	AWG	2	4	7	12	17	28	40	62	84	108
TW	6	AWG	1	2	4	7	10	16	23	36	48	62	97	141
TW	4	AWG	1	1	3	5	7	12	17	27	36	47	73	106
TW	3	AWG	1	1	2	4	6	10	15	23	31	40	63	91
TW	2	AWG	1	1	2	4	5	9	13	20	27	34	54	78
TW	1	AWG		1	1	3	4	6	9	14	19	25	39	57
TW	0	AWG		1	1	2	3	5	8	12	16	21	33	49
TW	00	AWG		1	1	1	3	5	7	10	14	18	29	41
TW	000	AWG		1	1	1	2	4	6	9	12	15	24	35
TW	0000	AWG			1	1	1	3	5	7	10	13	20	29
TW	250	MCM			1	1	1	2	4	6	8	10	16	23
TW	300	MCM			1	1	1	2	3	5	7	9	14	20
TW	350	MCM				1	1	1	3	4	6	8	12	18
TW	400	MCM				1	1	1	2	4	5	7	11	16
TW	500	MCM				1	1	1	1	3	4	6	9	14
TW	600	MCM					1	1	1	3	4	5	7	11
TW	700	MCM					1	1	1	2	3	4	7	10
TW	750	MCM					1	1	1	2	3	4	6	9
Type Letter	SIZE		1/2	3/4	1	1 1/4	1 1/2	2	2 1/2	3	3 1/2	4	5	6
THHN	14	AWG	13	24	39	69	154
THHN	12	AWG	10	18	29	51	70	114	164
THHN	10	AWG	6	11	18	32	44	73	104	160
THHN	8	AWG	3	5	9	16	22	36	51	79	106	136
THHN	6	AWG	1	4	6	11	15	26	37	57	76	98	154
THHN	4	AWG	1	2	4	7	9	16	22	35	47	60	94	137
THHN	3	AWG	1	1	3	6	8	13	19	29	39	51	80	116
THHN	2	AWG	1	1	3	5	7	11	16	25	33	43	67	97
THHN	1	AWG		1	1	3	5	8	12	18	25	32	50	72
THHN	0	AWG		1	1	3	4	7	10	15	21	27	42	61
THHN	00	AWG		1	1	2	3	6	8	13	17	22	35	51
THHN	000	AWG		1	1	1	3	5	7	11	14	18	29	42
THHN	0000	AWG		1	1	1	2	4	6	9	12	15	24	35
THHN	250	MCM			1	1	1	3	4	7	10	12	20	28
THHN	300	MCM			1	1	1	3	4	6	8	11	17	24
THHN	350	MCM			1	1	1	2	3	5	7	9	15	21
THHN	400	MCM				1	1	1	3	5	6	8	13	19
THHN	500	MCM				1	1	1	2	4	5	7	11	16
THHN	600	MCM				1	1	1	1	3	4	5	9	13
THHN	700	MCM					1	1	1	3	4	5	8	11
THHN	750	MCM					1	1	1	2	3	4	7