Baldor Baldor, MN850 manual NEC Wire Size and Protection Devices, 45x20

Wire Size and Protection Devices

Table 2-4 Control Wire Sizes and Tightening Torques

Control	Terminal	Wire Gauge *		Terminal Torque
Size		AWG	mm2	Lb–in	Nm
	L1, L2, L3, T1, T2, T3			106	12
1	(M8 Stud for Ring connector)	1/0	50
	Earth (Ground) Terminal			106	12
	(M8 Stud for Ring connector)
	L1, L2, L3, T1, T2, T3			106	12
2	(M8 Stud for Ring connector)	(2)	(2) 120
	Earth (Ground) Terminal	250MCM		106	12
	(M8 Stud for Ring connector)
	L1, L2, L3, T1, T2, T3	Busbar	size:	212	24
3, 4	** (Connector with two M10 holes on 30mm center)	45x20
	Earth (Ground) Terminal	60x10		212	24
	(M10 Stud for Ring connector)	80x10
	S0 and S1	14 – 22	0.5 – 2.5	4.5	0.5
All	X1 and X2	14 – 22	0.5 – 2.5	4.5	0.5
	K1 (11, 12, 14)	14 – 22	0.5 – 2.5	4.5	0.5
	K2 (21, 22, 24)	14 – 22	0.5 – 2.5	4.5	0.5

*Use same gauge wire for Earth ground as is used for L1, L2 and L3.

**Use terminal #4–350kcmil,1 per phase (ILSCO Part No.LO–350–S, LO–600–S or LO–1000–S or equivalent).

Table 2-5 NEC Wire Size and Protection Devices

Control Rating	Input Breaker	Input Fuse (Amps)		Wire Gauge
Amps	(Amps)
		Fast Acting	Time Delay	AWG	mm2
9	15	30	20	12	3.31
16	30	50	30	12	3.31
23	40	70	40	10	5.26
30	50	90	60	8	8.37
44	70	150	80	8	8.37
59	90	200	110	6	13.3
85	110	250	150	4	21.2
105	175	350	200	2	33.6
146	250	450	275	2/0	67.4
174	275	600	300	3/0	85.0
202	300	600	350	4/0	107.0
242	400	750	450	250MCM	127.0
300	450	900	600	350MCM	177.0
370	600	1200	700	500MCM	253.0
500	800	1500	900	(2) 250MCM	(2) 127.0
600	900	1800	1100	(2) 350MCM	(2) 177.0
750	1200	2500	1400	(2) 500MCM	(2) 253.0
900	1400	3000	1600	(2) 700MCM	(2) 355.0
1100	1600		2000	(3) 700MCM	(3) 355.0
1200	1800		2000	(3) 700MCM	(3) 355.0

Note: All wire sizes are based on 75° C copper wire. Higher temperature smaller gauge wire may be used per NEC and local codes. Recommended fuses/breakers are based on 40° C ambient, maximum continuous control output current and no harmonic current.

2-8 Installation MN850