One Spec

Engineering Approved Electrical Tables

E1 - Ground Wall Insulation Resistance

Detail	IPSMin Value	IPSUnit	IPSSource
AC Stator ≤ 1000 Vac incoming, min required to energize	5	MOHM at 40 C	IEEE 43-2013
AC Stator ≤ 1000 after repair	50	MOHM at 40 C	IEEE 1068-2015, section 8.13
AC Stator > 1000 Vac incoming, min required to energize	100	MOHM at 40 C	IEEE 43-2013
AC Stator > 1000 Vac after repair	250	MOHM at 40 C	IEEE 1068-2015 Section 8.13
AC wound rotor (random wind), min required to energize	5	MOHM at 40 C	IEEE 43-2013
AC wound rotor (random wind) after repair	50	MOHM at 40 C	IEEE 1068-2015, section 8.13
AC wound rotor (form wind), min required to energize	100	MOHM at 40 C	IEEE 43-2013
AC wound rotor (form wind) after repair	250	MOHM at 40 C	IEEE 1068-2015 Section 8.13
DC Armature Random Wound, min required to energize	5	MOHM at 40 C	IEEE 43-2013
DC Armature Random Wound, after repair	50	MOHM at 40 C	IPS
DC armature Form Wound incoming, min required to energize	5	MOHM at 40 C	IEEE 43-2013
DC armature Form Wound after repair	100	MOHM at 40 C	IPS
DC main field incoming, min required to energize	1.5	MOHM at 40 C	IEEE 43-2013
DC main field after repair	100	MOHM at 40 C	IPS
DC interpole (+ poleface + series) incoming, min required to energize	5	MOHM at 40 C	IEEE 43-2013
DC interpole (+ poleface + series)after repair	100	MOHM at 40 C	IPS
Synchronous rotor field incoming, min required to energize	1.5	MOHM at 40 C	IEEE 43-2013
Synchronous rotor field after repair	100	MOHM at 40 C	IPS
Brushless Exciter rotor, min required to energize	5	MOHM at 40 C	IEEE 43-2013
Brushless Exciter rotor after repair	50	MOHM at 40 C	IEEE 1068-2015, section 8.13
Brushless Exciter field frame, min required to energize	1.5	MOHM at 40 C	IEEE 43-2013
Brushless Exciter field frame after repair	100	MOHM at 40 C	IPS
Bearing Insulation	1	MOHM at 40 C	EASA AR100-2020
space heater circuit, incoming	1.5	MOHM at 40 C	IPS

E2 - Polarization Index

Detail	IPSMin Value	IPSUnit	IPSSource
NEMA CLass A / IEC CLass 105	1.5	IR (10min)/IR (1 min)	IEEE 43-2013
NEMA CLass B / IEC Class 130	2.0	IR (10min)/IR (1 min)	IEEE 43-2013
NEMA Class F / IEC Class 155	2.0	IR (10min)/IR (1 min)	IEEE 43-2013
NEMA Class H / IEC Class 180	2.0	IR (10min)/IR (1 min)	IEEE 43-2013
DC Armature	N/A	IR (10min)/IR (1 min)	IEEE 43-2013
Uninsulated winding (interpole circuit, bus bars, edgewound coil, etc)	N/A	IR (10min)/IR (1 min)	IEEE 43-2013
IR ≥ 5 Gohm	N/A		IEEE 43-2013

E3 - Winding Resistance Balance

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
Form Wound, lap, unbalance from average		1.0	%	EASA Technical Manual
Random Wound,lap, unbalance from average		1.0	%	EASA Technical Manual

E4 - Surge Test

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
L-L EAR		5	%	IPS
P-P EAR		5	%	IPS

E5 - High Potential Test

Detail	IPSMin Value	IPSMax Value	IPSSource
AC and DC	FAIL	PASS	IEEE 95
Space heater circuit	FAIL	PASS	NEMA MG1-2018 sec 3
rtd	FAIL	PASS	NEMA MG1-2018 sec 3

E6 - Core Loss

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
core loss value	1	6	watts/lb	EASA AR100-2020
back iron flux	85	90	klines/sq inch	IEEE Standard 432
increase in core loss post burnout		5	%	IPS
hot spot temperature difference compared to average		10°C (18°F)	degrees C (degrees F)	IEEE Standard 432
extended test average temperature rise over ambient		20°C (36°F)	degrees C (degrees F)	IEEE Standard 432

E7 - AC stator three phase balance test

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
calculated from AC volts and amps		5	% balance from average	IPS
Connection temperature delta		10	deg F	IPS

E8 - Voltage Drop Comparison Test

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
AC Voltage Drop Test	0	10%	percent deviation from average	IEEE 1068-2015
DC Voltage Drop Test	0	5%	percent deviation from average	IEEE 1068-2015

E9 - DC No Load Reverse Direction Speed Variation

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
field current and armture voltage constant		5	RPM	IPS

E10 - Single Phase Rotor Induction Test (spike test)

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
	0	3	percent current variation	IEEE 1068-2015

E11 - Power Factor, % Tip Up Test

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
		2	%	IEEE 286

E12 - Partial Discharge

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
		250	mv	IPS

E13 - Corona Camera Test

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
test values from procedure		visible corona		IEEE 1799

E14 - Electromagnetic probe

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
TVA corona probe		20	mA	IEEE 1434

E15 - Permanent Magnet Rotor Air Gap Flux Density

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
voltage to RPM ratio at speed	-10%	+10%	voltage/RPM ratio	IEEE 1068-2015

E16 - AC impedence balance test

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
calculated from AC volts and amps		5	% differene	IPS

E17 - Lightning Arrester

Descript	IPSDetail	IPSMin Value	IPSUnit	IPSSource
0 < LA < 1 KV	Megger test at 1 KV	100	Mohm	IEEE C62.01 and IEEE C62.11 (MOV)
1 KV < LA < 5 KV	Megger test at 2.5 KV	1500	Mohm	IEEE C62.01 and IEEE C62.11 (MOV)
5 KV < LA < 8 KV	Megger test at 2.5 KV	2500	Mohm	IEEE C62.01 and IEEE C62.11 (MOV)
8 KV < LA < 15 KV	Megger test at 2.5 KV	5000	Mohm	IEEE C62.01 and IEEE C62.11 (MOV)

E18 - Surge Capacitor

Descript	IPSDetail	IPSMin Value	IPSUnit	IPSSource
0 < LA < 1 KV	Megger test at 1 KV	100	Mohm	IEEE C62.01 and IEEE C62.11 (MOV)
1 KV < LA < 5 KV	Megger test at 2.5 KV	1500	Mohm	IEEE C62.01 and IEEE C62.11 (MOV)
5 KV < LA < 8 KV	Megger test at 2.5 KV	2500	Mohm	IEEE C62.01 and IEEE C62.11 (MOV)
8 KV < LA < 15 KV	Megger test at 2.5 KV	5000	Mohm	IEEE C62.01 and IEEE C62.11 (MOV)

E19 - Shaft Voltage

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
Ball Bearing	0	100	mV	EASA Tech Manual
Sleeve Bearing	0	200	mV	EASA Tech Manual

E20 - COMMUTATOR BAR TO BAR (DUCTOR)

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
resistance variation between bars		5	%	EASA Fundamentals of DC Operation

E21 - AC AMPS BALANCE DURING NO LOAD TEST RUN

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
amps variation w/ balanced voltage		5	% balance from average	IPS

E22 - Field Coil Resistance Comparison (DC Test)

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
		5	percent deviation from average	IEEE 1068-2015

E23 - Diode and SCR

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
diode forward bias	0.2	0.5	volts	IPS
diode reverse bias	Open circuit	Open circuit	volts	IPS
SCR gate resistance	8	50	ohms	IPS
SCR forward bias	Open circuit	Open circuit	volts	IPS
SCR reverse bias	Open circuit	Open circuit	volts	IPS

E1 - Ground Wall Insulation Resistance

Detail	IPSMin Value	IPSUnit	IPSSource
AC Stator ≤ 1000 Vac incoming, min required to energize	5	MOHM at 40 C	IEEE 43-2013
AC Stator ≤ 1000 after repair	50	MOHM at 40 C	IEEE 1068-2015, section 8.13
AC Stator > 1000 Vac incoming, min required to energize	100	MOHM at 40 C	IEEE 43-2013
AC Stator > 1000 Vac after repair	250	MOHM at 40 C	IEEE 1068-2015 Section 8.13
AC wound rotor (random wind), min required to energize	5	MOHM at 40 C	IEEE 43-2013
AC wound rotor (random wind) after repair	50	MOHM at 40 C	IEEE 1068-2015, section 8.13
AC wound rotor (form wind), min required to energize	100	MOHM at 40 C	IEEE 43-2013
AC wound rotor (form wind) after repair	250	MOHM at 40 C	IEEE 1068-2015 Section 8.13
DC Armature Random Wound, min required to energize	5	MOHM at 40 C	IEEE 43-2013
DC Armature Random Wound, after repair	50	MOHM at 40 C	IPS
DC armature Form Wound incoming, min required to energize	5	MOHM at 40 C	IEEE 43-2013
DC armature Form Wound after repair	100	MOHM at 40 C	IPS
DC main field incoming, min required to energize	1.5	MOHM at 40 C	IEEE 43-2013
DC main field after repair	100	MOHM at 40 C	IPS
DC interpole (+ poleface + series) incoming, min required to energize	5	MOHM at 40 C	IEEE 43-2013
DC interpole (+ poleface + series)after repair	100	MOHM at 40 C	IPS
Synchronous rotor field incoming, min required to energize	1.5	MOHM at 40 C	IEEE 43-2013
Synchronous rotor field after repair	100	MOHM at 40 C	IPS
Brushless Exciter rotor, min required to energize	5	MOHM at 40 C	IEEE 43-2013
Brushless Exciter rotor after repair	50	MOHM at 40 C	IEEE 1068-2015, section 8.13
Brushless Exciter field frame, min required to energize	1.5	MOHM at 40 C	IEEE 43-2013
Brushless Exciter field frame after repair	100	MOHM at 40 C	IPS
Bearing Insulation	1	MOHM at 40 C	EASA AR100-2020
space heater circuit, incoming	1.5	MOHM at 40 C	IPS

E2 - Polarization Index

E3 - Winding Resistance Balance

E4 - Surge Test

E5 - High Potential Test

E6 - Core Loss

E7 - AC stator three phase balance test

E8 - Voltage Drop Comparison Test

E9 - DC No Load Reverse Direction Speed Variation

E10 - Single Phase Rotor Induction Test (spike test)

E11 - Power Factor, % Tip Up Test

E12 - Partial Discharge

E13 - Corona Camera Test

E14 - Electromagnetic probe

E15 - Permanent Magnet Rotor Air Gap Flux Density

E16 - AC impedence balance test

E17 - Lightning Arrester

E18 - Surge Capacitor

E19 - Shaft Voltage

E20 - COMMUTATOR BAR TO BAR (DUCTOR)

E21 - AC AMPS BALANCE DURING NO LOAD TEST RUN

E22 - Field Coil Resistance Comparison (DC Test)

E23 - Diode and SCR

Engineering Approved Mechanical Tables

M1 - Allowable Shaft Extension TIR

Detail	IPSMax Value	IPSUnit	IPSSource
less than 950 RPM	0.003	inches	IEEE 1068 -2015
950 to 1450 RPM	0.002	inches	IEEE 1068 -2015
1451 to 2000 RPM	0.0015	inches	IEEE 1068 -2015
greater than 2000 RPM	0.001	inches	IEEE 1068 -2015

M2 - Nominal Shaft Extension Diameter

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
(NEMA) 0.1875 to 1.5000	-0.0005	+0.000	inches	EASA AR100-2020
(NEMA) Over 1.5000 to 6.500	-0.001	+0.000	inches	EASA AR100-2020
(IEC) j6 over .236(6mm) to .394(10mm)	-0.0001	+0.0003	inches	EASA AR100-2020
(IEC) j6 over .394(10mm) to .709(18mm)	-0.0001	+0.0003	inches	EASA AR100-2020
(IEC) j6 over .709(18) to 1.181(30mm)	-0.0002	+0.0004	inches	EASA AR100-2020
(IEC) k6 over 1.181(30mm) to 1.969(50mm)	+0.0001	+0.0007	inches	EASA AR100-2020
(IEC) m6 over 1.969(50mm) to 3.150(80mm)	+0.0004	+0.0012	inches	EASA AR100-2020
(IEC) m6 over 3.150(80mm) to 4.724(120mm)	+0.0005	+0.0014	inches	EASA AR100-2020
(IEC) m6 over 4.724(120mm) to 7.087(180mm)	+0.0006	+0.0016	inches	EASA AR100-2020
(IEC) m6 over 7.087(180mm) to 9.843(250mm)	+0.0007	+0.0018	inches	EASA AR100-2020
(IEC) m6 over 9.843(250mm) to 12.402(315mm)	+0.0008	+0.0020	inches	EASA AR100-2020
(IEC) m6 over 12.402(315mm) to 15.748(400mm)	+0.0008	+0.0022	inches	EASA AR100-2020
(IEC) m6 over 15.748(400mm) to 19.685(500mm)	+0.0009	+0.0025	inches	EASA AR100-2020
(IEC) m6 over 19.685(500mm) to 24.803(630mm)	+0.0010	+0.0028	inches	EASA AR100-2020

M3 - Nominal Shaft Extension Keyseat Width Tolerance

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
(NEMA) 0.188 to including 0.750	0	+0.002	inches	EASA AR100-2020
(NEMA) Over 0.750 to 1.500	0	+0.003	inches	EASA AR100-2020
(IEC) over 0.078(2mm) to 0.118(3mm)	-0.0011	-0.0002	inches	EASA AR100-2020
(IEC) over 0.118(3mm) to .236(6mm)	-0.0012	0	inches	EASA AR100-2020
(IEC) over .236(6mm) to .394(10mm)	-0.0014	0	inches	EASA AR100-2020
(IEC) over .394(10mm) to .709(18mm)	-0.0017	0	inches	EASA AR100-2020
(IEC) over .709(18mm) to 1.181(30mm)	-0.002	0	inches	EASA AR100-2020
(IEC) over 1.181(30mm) to 1.969(50mm)	-0.0024	0	inches	EASA AR100-2020
(IEC) over 1.969(50mm) to 3.150(80mm)	-0.0029	0	inches	EASA AR100-2020
(IEC) over 3.1150(80mm) to 3.937(100mm)	-0.0034	0	inches	EASA AR100-2020

M4 - Mounting Flange Face and Rabbet TIR

Detail	IPSMax Value	IPSUnit	IPSSource
NEMA type D&C, Flange dia less than 12"	0.004	inches	EASA AR100 2020
NEMA type D&C, Flange dia. 12 to and including 24"	0.007	inches	EASA AR100 2020
NEMA type D&C, flange dia. Greater than 24 up to 40"	0.009	inches	EASA AR100 2020
NEMA Type P, dia Less Than 12	0.004	inches	EASA AR100 2020
NEMA Type P, dia 12 to and including 24	0.007	inches	EASA AR100 2020
NEMA Type P, dia over 24 to and including 40	0.009	inches	EASA AR100 2020
NEMA Type P, dia over 40 to and including 60	0.012	inches	EASA AR100 2020
IEC, dia > 1.181 ≤ 1.969	0.003	inches	EASA AR100 2020
IEC, dia > 1.969 ≤ 3.150	0.003	inches	EASA AR100 2020
IEC, dia > 3.150 ≤ 4.724	0.003	inches	EASA AR100 2020
IEC, dia > 4.724 ≤ 7.087	0.004	inches	EASA AR100 2020
IEC, dia > 7.087 ≤ 9.843	0.004	inches	EASA AR100 2020
IEC, dia > 9.843 ≤ 12.402	0.005	inches	EASA AR100 2020
IEC, dia > 12.402 ≤ 15.748	0.005	inches	EASA AR100 2020
IEC, dia < 15.748 ≤ 19.685	0.005	inches	EASA AR100 2020
IEC, dia < 19.685 ≤ 24.803	0.006	inches	EASA AR100 2020
IEC, dia < 24.803 ≤ 31.496	0.006	inches	EASA AR100 2020
IEC, dia < 31.496 ≤ 39.370	0.008	inches	EASA AR100 2020
IEC, dia < 39.370 ≤ 49.213	0.008	inches	EASA AR100 2020
IEC, dia < 49.213 ≤ 62.992	0.010	inches	EASA AR100 2020
IEC, dia < 69.992 ≤ 78.840	0.010	inches	EASA AR100 2020
IEC, dia < 78.740 ≤ 86.614	0.012	inches	EASA AR100 2020

M5 - Mounting Flange Diameter Size

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
NEMA type D&C, Flange dia less than 12"	-0.003	0	inches	EASA AR100-2020
NEMA type D&C, Flange dia. 12 to and including 24"	-0.005	0	inches	EASA AR100-2020
NEMA type D&C, flange dia. Greater than 24 up to 40"	-0.007	0	inches	EASA AR100-2020
NEMA Type P, dia Less Than 12	0	+0.003	inches	EASA AR100-2020
NEMA Type P, dia 12 to and including 24	0	+0.005	inches	EASA AR100-2020
NEMA Type P, dia over 24 to and including 40	0	+0.007	inches	EASA AR100-2020
NEMA Type P, dia over 40 to and including 60	0	+0.010	inches	EASA AR100-2020
IEC, dia > 1.181 ≤ 1.969	-0.0002	+0.0004	inches	EASA AR100-2020
IEC, dia > 1.969 ≤ 3.150	-0.0003	+0.0005	inches	EASA AR100-2020
IEC, dia > 3.150 ≤ 4.724	-0.0004	+0.0005	inches	EASA AR100-2020
IEC, dia > 4.724 ≤ 7.087	-0.0004	+0.0006	inches	EASA AR100-2020
IEC, dia > 7.087 ≤ 9.843	-0.0005	+0.0006	inches	EASA AR100-2020
IEC, dia > 9.843 ≤ 12.402	-0.0013	0	inches	EASA AR100-2020
IEC, dia > 12.402 ≤ 15.748	-0.0014	0	inches	EASA AR100-2020
IEC, dia < 15.748 ≤ 19.685	-0.0016	0	inches	EASA AR100-2020
IEC, dia < 19.685 ≤ 24.803	-0.0017	0	inches	EASA AR100-2020
IEC, dia < 24.803 ≤ 31.496	-0.002	0	inches	EASA AR100-2020
IEC, dia < 31.496 ≤ 39.370	-0.0022	0	inches	EASA AR100-2020
IEC, dia < 39.370 ≤ 49.213	-0.0026	0	inches	EASA AR100-2020
IEC, dia < 49.213 ≤ 62.992	-0.0031	0	inches	EASA AR100-2020
IEC, dia < 69.992 ≤ 78.840	-0.0036	0	inches	EASA AR100-2020
IEC, dia < 78.740 ≤ 86.614	-0.0043	0	inches	EASA AR100-2020

M6 - Mounting Foot Flatness

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
foot mounted motor		0.005	inches	API 541-5th

M7 - Balance Requirement

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
400 RPM and slower		G2.5	balance grade	IPS
over 400 RPM		G1.0	balance grade	IPS

M8 - Standard Thread Torque

SAE Thread Size	IPSTorque	IPSTorque	IPSTorque	IPSTorque	IPSTorque	IPSUnit	IPSSource
bolt material	GR 5	GR8	STAINLESS STEEL	BRASS	SILICON BRONZE
10-24	25	40	24	19.2	21.6	IN-LB	Reliance SIS1027
1/4-20	7	9	6.6	5.1	5.7	FT-LB	Reliance SIS1027
1/4-28	8	11	8.3	6.4	7.3	FT-LB	Reliance SIS1027
5/16-18	14	19	11.5	8.9	10.3	FT-LB	Reliance SIS1027
3/8-16	24	33	20.6	16	18.3	FT-LB	Reliance SIS1027
3/8-24	29	38	22.6	17.7	20	FT-LB	Reliance SIS1027
7/16-14	25	55	33.8	26.4	29.1	FT-LB	Reliance SIS1027
1/2-13	55	85	45.1	35.2	40	FT-LB	Reliance SIS1027
5/8-11	110	165	96.7	75.6	85.8	FT-LB	Reliance SIS1027
3/4-10	200	285	131.8	104.1	118	FT-LB	Reliance SIS1027
7/8-9	315	450	202.5	158.9	178.3	FT-LB	Reliance SIS1027
1-8	475	670	299.6	234.6	265.4	FT-LB	Reliance SIS1027
1.25-7	860	1425	546	428	485	FT-LB	Reliance SIS1027
1.5-6	1375	2275	930	727	822	FT-LB	Reliance SIS1027

M8.1 - Metric Thread Torque

Nominal Diameter	IPS-30% Std. Torque	IPS+30% Std. Torque	IPSN⋅m
M1	0.01	0.03	N⋅m
M1.1	0.02	0.04	N⋅m
M1.2	0.03	0.05	N⋅m
M1.4	0.04	0.08	N⋅m
M1.6	0.06	0.11	N⋅m
M1.8	0.09	0.17	N⋅m
M2	0.12	0.23	N⋅m
M2.2	0.16	0.30	N⋅m
M2.5	0.25	0.46	N⋅m
M3	0.44	0.82	N⋅m
M3.5	0.70	1.30	N⋅m
M4	1.0	1.9	N⋅m
M4.5	1.5	2.8	N⋅m
M5	2.1	3.9	N⋅m
M6	3.5	6.6	N⋅m
M7	6.0	11.1	N⋅m
M8	8.6	16.0	N⋅m
M10	17	32	N⋅m
M12	30	55	N⋅m
M14	47	88	N⋅m
M16	74	138	N⋅m
M18	102	189	N⋅m
M20	144	268	N⋅m
M22	196	364	N⋅m
M24	249	463	N⋅m
M27	365	677	N⋅m
M30	495	919	N⋅m
M33	673	1251	N⋅m
M36	868	1612	N⋅m
M39	1120	2080	N⋅m
M42	1386	2574	N⋅m
M45	1736	3224	N⋅m
M48	2072	3848	N⋅m
M52	2688	4992	N⋅m
M56	3346	6214	N⋅m
M60	4165	7735	N⋅m
M64	5040	9360	N⋅m
M68	6118	11362	N⋅m

M9 - Vibration (no load, rated speed)

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
shaft displacement		1.0	mil, peak to peak	IPS
housing velocity		0.1	in/s, peak	IPS
slow roll (electrical and mechanical runout)		0.0005	in, peak to peak	IPS
prox probe gap voltage for 3300xl	8	10	V	Bently Nevada
prox probe gap voltage setting for NSV probe	6	8	V	Bently Nevada
data collector F max < 240 RPM		1000	hz	IPS
data collector F max 240 RPM-600 RPM		1000	hz	IPS
data collector F max > 600 RPM		1600	hz	IPS
data collector # lines < 240 RPM		6400	# lines	IPS
data collector # lines 240 RPM- 600 RPM		3200	# lines	IPS
data collector # lines > 600 RPM		1600	# lines	IPS

M10 - Bearing Temperature

Detail	IPSMax Value	IPSUnit	IPSSource
no load, sleeve bearing	165	deg f	IPS
no load, anti-friction bearing	165	deg f	IPS
bearing temperature differential (horizontal only)	8° (15°)	deg C (deg F)	IPS

M11 - Rotor Core TIR (using bearing datum)

Detail	IPSMax Value	IPSUnit	IPSSource
1800 RPM synchronous speed and greater induction machine	0.003	inches	IPS
below 1800 RPM synchronous speed induction machine	0.005	inches	IPS
DC	5	% of airgap	IPS
Synchronous main poles	5	% of airgap	IPS
Synchronous exciter rotor	5	% of airgap	IPS

M12 - babbit bearing clearance

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
Horizontal Machine, L/D less than .7	0.0013in/in - .001in	0.0013in/in + .001in	in clearance/in diameter	IPS, DIN 31698
Horizontal Machine, L/D between .7 and .99	0.0016in/in - .001in	0.0016in/in + .001in	in clearance/in diameter	IPS, DIN 31698
Horizontal Machine, L/D between 1.0 and 1.5	0.0019in/in - .001in	0.0019in/in + .001in	in clearance/in diameter	IPS, DIN 31698
Horizontal Machine, L/D over 1.5	0.0022in/in - .001in	0.0022in/in + .001in	in clearance/in diameter	IPS, DIN 31698
vertical guide bearing top	0.00075in/in +0.001	0.00075in/in +0.002	in clearance/in diameter	IPS
vertical guide bearing bottom	0.00075in/in +0.002	0.00075in/in +0.003	in clearance/in diameter	IPS

for horizontal machines. L/D is the ratio defined as: Contact Length of babbit divided by shaft diameter. Elliptical bearings, vertical dimension per cylindrical spec, horizontal dimension cylindrical spec x 2

M13 - Babbit Bonding

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
ultrasonic test, minimum bond coverage	80		percent	IPS

M14 - Babbit Bearing Contact Pattern

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
measured over length of bottom of bearing	80		percent	API 541 5TH

M15 - Sleeve Bearing Journal Cylindricity

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
includes roundness and taper		0.0005	inches	EASA Tech Manual 2021

M16 - Sleeve Bearing Housing Fit

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
API (interference)	0	0.002	inches interference	API 541 5th
non-api (clearance)	0.001	0.003	inches clearance	EASA Tech 2022

M17 - Oil Ring Roundness

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
	0	0.002	inches per inch diameter	IPS

M18 - diametral seal clearance, oil lubrication, fixed labyrinth

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
≥ 3000 RPM, inboard	0.012	0.021	inches	Reliance 423316-309
≥ 3000 RPM, outboard	0.027	0.036	inches	Reliance 423316-309
< 3000 RPM, inboard and outboard	0.027	0.036	inches	Reliance 423316-309

for grease lubricated bearings, see table M33

M19 - Oil Standpipe Roundness

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
	0	0.010	inches	IPS

M20 - Oil Standpipe Concentricity to Bearing Centerline

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
	0	0.020	inches	IPS

M22 - Airgap Variation

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
AC machine		10	percent from average	IEEE 1068-2015
DC machine; evaluate main and interpole airgaps separately		10	percent from average	IEEE 2455 *

M21 - Deviation Between Magnetic and Mechanical Center

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
Float		0.094	inches	API 541 3rd

M23 - Brush Spacing

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
brush position measured around circumference of commutator (quartering)	0	0.04	inches	EASA AR100-2020
brushholder to comm clearance	0.06	0.125	inches	EASA AR100-2020

M24 - Commutator Undercut

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
	1 x mica width	1.5 x mica width	inches	EASA AR100-2020

M25 - Commutator TIR

Detail	IPSMin value	IPSMax Value	IPSUnit	IPSSource
up to 5000ft/min surface speed		0.003	inches	EASA AR100-2020
over 5000ft/min surface speed		0.0015	inches	EASA AR100-2020

M26 - Slip Ring TIR

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
up to 5000ft/min surface speed		0.003	inches	EASA AR100-2020
over 5000ft/min surface speed		0.0015	inches	EASA AR100-2020

M27 - Brush to Brush Holder (box) Clearance

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
Nominal Brush Dimensions Width and Thickness
1/16	0.00175	0.0056	inches	EASA AR100-2020
1/8	0.002	0.0062	inches	EASA AR100-2020
3/16	0.002	0.007	inches	EASA AR100-2020
1/4, 5/16, 3/8	0.0022	0.0076	inches	EASA AR100-2020
7/16, 1/2, 5/8	0.0028	0.0091	inches	EASA AR100-2020
3/4, 7/8, 1	0.0032	0.01	inches	EASA AR100-2020
1-1/4, 1-1/2	0.0039	0.0118	inches	EASA AR100-2020
1-3/4, 2	0.0043	0.013	inches	EASA AR100-2020

M28 - General Industrial Keyed Coupling Fit (interference), Contact Engineering for Keyless

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
shaft dia > 0.500 ≤ 1.500	0	0.0010	inch	FALK
shaft dia > 1.500 ≤ 2.1875	0	.0 015	inch	FALK
shaft dia > 2.1875 ≤ 3.000	0	0.0020	inch	FALK
shaft dia > 3.000 ≤ 4.000	0.0005	0.0025	inch	FALK
shaft dia > 4.000 ≤ 5.000	0.0010	0.0035	inch	FALK
shaft dia > 5.000 ≤ 7.000	0.0015	0.0040	inch	FALK
shaft dia > 7.000 ≤ 8.000	0.0020	0.0050	inch	FALK
shaft dia > 8.000 ≤ 9.000	0.0025	0.0055	inch	FALK
shaft dia > 9.000 ≤ 10.000	0.0030	0.0060	inch	FALK
shaft dia > 10.000 ≤ 11.000	0.0030	0.0065	inch	FALK
shaft dia > 11.000 ≤ 12.000	0.0040	0.0070	inch	FALK
shaft dia > 12.000 ≤ 13.000	0.0045	0.0075	inch	FALK
shaft dia > 13.000 ≤ 14.000	0.0050	0.0080	inch	FALK
shaft dia > 14.000 ≤ 15.000	0.0055	0.0085	inch	FALK
shaft dia > 15.000 ≤ 16.000	0.0055	0.0090	inch	FALK
shaft dia > 16.000 ≤ 17.000	0.0060	0.0095	inch	FALK
shaft dia > 17.000 ≤ 18.000	0.0070	0.0105	inch	FALK
shaft dia > 18.000 ≤ 19.000	0.0075	0.0110	inch	FALK
shaft dia > 1.5625 ≤ 20.000	0.0085	0.0120	inch	FALK

M29 - Coupling Fit (clearance)

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
shaft dia > 0.500 ≤ 1.500			inch	FALK
shaft dia > 1.500 ≤ 2.1875	0	0.0015	inch	FALK
shaft dia > 2.1875 ≤ 3.000	0	0.0020	inch	FALK
shaft dia > 3.000 ≤ 7.000	0.0000	0.0025	inch	FALK

M30 - Coupling Alignment, acceptable

Detail	IPSMax Value	IPSUnit	IPSSource
Face Gap 600 RPM	1.5	mils/inch diameter	Pruftechnik
Face Gap 900 RPM	1.0	mils/inch diameter	Pruftechnik
Face Gap 1200 RPM	0.8	mils/inch diameter	Pruftechnik
Face Gap 1800 RPM	0.5	mils/inch diameter	Pruftechnik
Face Gap 3600 RPM	0.3	mils/inch diameter	Pruftechnik
Face Gap 7200 RPM	0.2	mils/inch diameter	Pruftechnik
Shaft Offset 600 RPM	9.0	mils	Pruftechnik
Shaft Offset 900 RPM	6.0	mils	Pruftechnik
Shaft Offset 1200 RPM	4.0	mils	Pruftechnik
Shaft Offset 1800 RPM	3.0	mils	Pruftechnik
Shaft Offset 3600 RPM	1.5	mils	Pruftechnik
Shaft Offset 7200 RPM	1.0	mils	Pruftechnik
Spacer Shaft 600 RPM	3.0	mils offset/inch spacer length	Pruftechnik
Spacer Shaft 900 RPM	2.0	mils offset/inch spacer length	Pruftechnik
Spacer Shaft 1200 RPM	1.5	mils offset/inch spacer length	Pruftechnik
Spacer Shaft 1800 RPM	1.0	mils offset/inch spacer length	Pruftechnik
Spacer Shaft 3600 RPM	0.5	mils offset/inch spacer length	Pruftechnik
Spacer Shaft 7200 RPM	0.25	mils offset/inch spacer length	Pruftechnik

M31 - Surface Finish

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
anti friction bearing fit - shaft		63	microinches RMS	EASA Tech Manual 2021
labyrinth seal section - shaft		63	microinches RMS	IPS
radial lip seal - shaft	8	20	microinches RMS	SKF / CR Seals
seal section - housing		63	microinches RMS	IPS
bearing fit - housing		63	microinches RMS	IPS
sleeve bearing journal	12	20	microinches RMS	IPS
shaft extension		63	microinches RMS	EASA Tech Manual 2021
rotor core fit section		63	microinches RMS	IPS
commutator	40	60	microinches RMS	EASA AR100-2020
slip rings	40	60	microinches RMS	EASA AR100-2020
shaft journal under bearing carrier		64	microinches RMS	IPS
vertical thrust bearing runner	12	16	microinches RMS	Kingsbury manual

M32 - Bolt Torque into Laminations

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
multiply GRADE 5 torque rating by:		0.8		GEH-3258H

M33 - Diametral seal clearance for non-labyrinth (straight), grease lubricated bearings

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
Diametrical Clearance	0.016	0.040	inches	IPS

for labyrinth seals see table M18

M34 - Vertical Motor Shaft Ring Groove Width (EW Dimension)

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
Shaft Diameter (U Dimension)
0.875 to 2.500	0.375	0.377	inches	NEMA MG 1-2016
2.625 to 4.500	0.500	0.503	inches	NEMA MG 1-2016
4.625 to 6.000	0.750	0.755	inches	NEMA MG 1-2016

M35 - Vertical Motor Shaft Ring Groove Location - End of Shaft to Inboard Edge (EX Dimension)

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
0.875 to 2.500	0.745	0.75	inches	NEMA MG 1-2016
2.625 to 4.500	0.990	1.000	inches	NEMA MG 1-2016
4.625 to 6.000	1.485	1.500	inches	NEMA MG 1-2016

M36 - Ring Groove Shaft Keyseat diameter, vertical (EU Dimension)

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
0.875 to 1.000 (0.6875 to 0.8125)	-0.005	+0.000	inches	NEMA MG 1-2016
1.125 to 1.500 (0.875 to 1.250)	-0.005	+0.000	inches	NEMA MG 1-2016
1.625 to 2.500 (1.250 to 2.125)	-0.005	+0.000	inches	NEMA MG 1-2016
2.625 to 4.500 (2.125 to 4.000)	-0.010	+0.000	inches	NEMA MG 1-2016
4.625 to 6.000 (3.875 to 5.250)	-0.015	+0.000	inches	NEMA MG 1-2016

M37 - Antifriction Bearing Fits

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
Use antifriction bearing fits tab				IPS

M38 - Natural Frequency Range Restrictions during test run

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
Percent from running speed	-15	+15	% of running speed	API 541-2003
Percent from 1 and 2 time line frequency	-15	+15	% of line frequency and harmonics	API 541-2003
Location of natural frequency below running speed	40	60	% of running speed	API 541-2003

M39 - Radial lip seal housing surface finish

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
	64	128	µin	SKF industrial shaft seals manual

M40 - Keyway parallelism to shaft centerline (skew)

Detail	IPSMax Value	IPSUnit	IPSSource
NEMA ES (keyway length) dimension <= 4.00"	0.002	inches	NEMA MG-1 2021
ES > 4.00 - <= 10.00"	0.0005	inches/inch	NEMA MG-1 2021
ES > 10.00"	0.005	inches	NEMA MG-1 2021

M41 - Keyway lateral displacement to shaft centerline

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
		0.010	inches	NEMA MG-1 2021

M42 - Radial clearance between key and keyway

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
	0.010	0.020	inches	FALK 427-109

M43 - Thrust runner face TIR, vertical machine

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
		0.0005	inches	API 687 1ST

M44 - Vertical thrust hub to shaft fit (Clearance) - rolling element

Detail	IPSMax Value	IPSUnit	IPSSource
shaft diameter size range	0.0009	inches	EPRI 1000897
0.710" - 1.190"	0.0009	inches
1.191" - 1.970"	0.001	inches
1.971" - 3.150"	0.0012	inches
3.151" - 4.730"	0.0015	inches
4.731" - 7.090"	0.0017	inches
7.091" - 9.850"	0.002	inches

M45 - Circularity of bearing journal and housing bore, anti-friction bearing

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
Size range (mm) [over to inclusive]				SKF Inst. & Maint. 2018
6 to 10	0.000	0.0001	inches
10 to 18	0.000	0.0002	inches
18 to 50	0.000	0.0002	inches
30 to 50	0.000	0.0002	inches
50 to 80	0.000	0.0003	inches
80 to 120	0.000	0.0003	inches
120 to 180	0.000	0.0004	inches
180 to 250	0.000	0.0004	inches
250 to 315	0.000	0.0005	inches
315 to 400	0.000	0.0005	inches
400 to 500	0.000	0.0005	inches

M46 - TIR of bearing journal shoulder, anti-friction bearing

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
Size range (mm) [over to inclusive]				SKF Inst. & Maint. 2018
6 to 10	0.000	0.0002	inches
10 to 18	0.000	0.0003	inches
18 to 50	0.000	0.0004	inches
30 to 50	0.000	0.0004	inches
50 to 80	0.000	0.0005	inches
80 to 120	0.000	0.0006	inches
120 to 180	0.000	0.0007	inches
180 to 250	0.000	0.0008	inches
250 to 315	0.000	0.0009	inches
315 to 400	0.000	0.0010	inches
400 to 500	0.000	0.0011	inches

M47 - Sleeve bearing endplay

Detail	IPSMin Value	IPSUnit	IPSSource
typical design, may be customized			NEMA MG-1 2021
all speeds, 125hp to 500hp, incl.	0.25	inches	NEMA MG-1 2021
more than 1800 rpm, 300 to 500hp	0.5	inches	NEMA MG-1 2021

M48 - Bearing shoulder TIR (sleeve)

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
		0.0010	inches	API 687 1ST

M49 - Temperature stabilization (bearings, stators, core iron, etc.)

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
delta Temp in 30 minute period		1(1.8)	deg C (deg F)	IEEE 112-2004

M50 - Sleeve bearing housing pressure

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
	-0.1	0.1	in H2O	Reliance 419530-105

M51 - Shaft size for RENK floating labyrinth seal

Detail	IPSMin Value	IPSMax Value	IPSUnit	IPSSource
ISO tolerance class	e8	e8		RENK Catalog

M1 - Allowable Shaft Extension TIR

Detail	IPSMax Value	IPSUnit	IPSSource
less than 950 RPM	0.003	inches	IEEE 1068 -2015
950 to 1450 RPM	0.002	inches	IEEE 1068 -2015
1451 to 2000 RPM	0.0015	inches	IEEE 1068 -2015
greater than 2000 RPM	0.001	inches	IEEE 1068 -2015