		Table of Contents
PART 1	DEFINITIONS ...............................................................................................		1
Chapter 1-1	General Issues.............................................................................................................		1
Chapter 1-2	Definitions of Transmission and Distribution Lines...................................................		4
Chapter 1-3	Definitions of Distribution Equipment and Substations...........................................		11
Chapter 1-4	Definitions of Protective Relays and Control Systems.............................................		12
Chapter 1-5	Definitions of Metering ............................................................................................		12
Chapter 1-6	Definitions of Earthing .............................................................................................		12
PART 2	GENERAL REQUIREMENTS ..................................................................		15
Chapter 2-1	General Issues...........................................................................................................		15
Chapter 2-2	Electrical Equipment ................................................................................................		26
Chapter 2-2-1		The Selection of the Conductor Cross-Section Area ...............................................	26
Chapter 2-2-2		The Selection of Electrical Equipment by Short Circuit Conditions.......................	46
Chapter 2-3	Transmission and Distribution Lines........................................................................		52
Chapter 2-3-1		House and Outside Wiring Systems with Voltage up to 35kV ................................	52
Chapter 2-3-2		Power Cable Line Systems with voltage up to 220kV ............................................	57
Chapter 2-3-3		Overhead Power Line Systems with voltage up to 500kV......................................	62
Chapter 2-4	Distribution Equipment up to 1kV ...........................................................................		70
Chapter 2-5	Substations above 1kV .............................................................................................		71
Chapter 2-6	Measure the electrical energy (Metering).................................................................		83
Chapter 2-6-1		Metering System .....................................................................................................	83
Chapter 2-6-2		Electrical Measurements .........................................................................................	90
PART 3	TRANSMISSION AND DISTRIBUTION LINES....................................		95
Chapter 3-1	House and Outside Wiring Systems with Voltage up to 35kV .................................		95
Chapter 3-1-1		The Selection of Types of House and Outside Wirings with voltage up
		to 1kV and Installation Methods .............................................................................	95
Chapter 3-1-2		House Wirings with Voltage up to 1kV.................................................................	100
Chapter 3-1-3		Outside Wirings with Voltage up to 1kV...............................................................	103
Chapter 3-1-4		House and Outside Wirings with Voltages above 1kV up to 35kV.......................	104
Chapter 3-2	Power Cable Line Systems with Voltage up to 220kV ...........................................		106
Chapter 3-2-1		The Selection of Cables.........................................................................................	106
Chapter 3-2-2		Installation of Cable Connection Boxes and Cable Terminals ..............................	109
Chapter 3-2-3		Special Requirements for Power Cable Lines.......................................................	110
Chapter 3-2-4		Cables Installed Underground ...............................................................................	111
Chapter 3-2-5		Installation of Power Cable Lines in Cable Structures..........................................	114
Chapter 3-2-6		Installation of Cable Lines in Production Halls, Water or Special
		Structures...............................................................................................................	120

Chapter 3-3	Overhead Power Line Systems with Voltage up to 500kV.....................................		123
Chapter 3-3-1		Power Conductors and Lightning Conductors ......................................................	123
Chapter 3-3-2		Arrangement of Power Conductors and Lightning Conductors ............................	126
Chapter 3-3-3		Insulators...............................................................................................................	129
Chapter 3-3-4		Power Line Accessories ........................................................................................	131
Chapter 3-3-5		Overvoltage Protection..........................................................................................	131
Chapter 3-3-6		Poles......................................................................................................................	133
Chapter 3-3-7		Particular Requirement..........................................................................................	138
Chapter 3-3-8		Traversing Non-PopulatedAreas ..........................................................................	139
Chapter 3-3-9		Traversing PopulatedAreas ...................................................................................	140
Chapter 3-3-10		Traversing Areas with Water .................................................................................	141
Chapter 3-3-11		Crossing or Going Nearby Overhead Power Lines ...............................................	142
Chapter 3-3-12		Crossing or go near Peripheral Telecommunication’s Cable Network..................	143
Chapter 3-3-13		Crossing or Going Nearby Special Structures and/or Places ................................	148
PART 4	DISTRIBUTION EQUIPMENT AND SUBSTATIONS ........................		155
Chapter 4-1	Distribution Equipment up to 1kV .........................................................................		155
Chapter 4-1-1		Electric Equipment Installation.............................................................................	155
Chapter 4-1-2		Distribution Panel Boards .....................................................................................	157
Chapter 4-2	Distribution Equipment and Substations above 1kV..............................................		159
Chapter 4-2-1		Outdoor Distribution Equipment and Outdoor Substations ..................................	159
Chapter 4-2-2		Indoor Distribution Equipment and Substations ...................................................	163
Chapter 4-2-3		Workshop Substation.............................................................................................	169
Chapter 4-2-4		Distribution Equipment and On-Pole Substation ..................................................	172
Chapter 4-2-5		Lighting Protection................................................................................................	174
Chapter 4-2-6		Lightning Protection for Rotation Machine ..........................................................	182
Chapter 4-2-7		Internal Overvoltage Protection ............................................................................	185
Chapter 4-2-8		Installation of Power Transformers .......................................................................	187
Chapter 4-2-9		Battery Systems.....................................................................................................	193
PART 5	PROTECTIVE RELAYS AND CONTROL SYSTEMS........................		196
Chapter 5-1	Protective Relays up to 1kV ...................................................................................		196
Chapter 5-2	Protective Relays above 1kV..................................................................................		199
Chapter 5-2-1		Common Protection Methods................................................................................	199
Chapter 5-2-2		Protection of Generators........................................................................................	208
Chapter 5-2-3		Protection of Transformers and Shunt Reactors....................................................	212
Chapter 5-2-4		Protection of Transformer and Generator Blocks..................................................	216
Chapter 5-2-5		Protection of Overhead Lines and Cables with Isolated Neutral...........................	222
Chapter 5-2-6		Protection of Overhead Lines and Cables with Efficient Earthed
		Neutral...................................................................................................................	224
Chapter 5-2-7		Protection of Compensating Capacitors................................................................	229
Chapter 5-2-8		Protection of Busbars ............................................................................................	229
		ii

Chapter 5-2-9		Protection of Synchronous Compensators ............................................................	232
Chapter 5-2-10		Protection of Underground Cable Lines ................................................................	233
Chapter 5-3	Control Systems......................................................................................................		233
Chapter 5-3-1		Control equipment and Auto - reclosers ..................................................................	233
Chapter 5-3-2		Auto Switching Power Supply Devices ................................................................	238
Chapter 5-3-3		Auto - synchronization of Generators .....................................................................	240
Chapter 5-3-4		Auto - control Exciter Systems, Auto - control of Reactive Power, Auto -
		voltage Regulators .................................................................................................	241
Chapter 5-3-5		Auto - control Frequency and A ctive Power ...........................................................	243
Chapter 5-3-6		Auto - prevention of Disturbances ..........................................................................	244
Chapter 5-3-7		Auto - elimination of Asynchronous Mode .............................................................	245
Chapter 5-3-8		Auto - prevention of Frequency Decrease ...............................................................	245
Chapter 5-3-9		Auto - prevention of Frequency Increase ................................................................	246
Chapter 5-3-10		Auto - prevention of Voltage Decrease ...................................................................	246
Chapter 5-3-11		Auto - prevention of Voltage Increase .....................................................................	247
Chapter 5-3-12		Auto - prevention of Overload of Electrical Equipment .........................................	247
Chapter 5-3-13		Remote Telecontrol Systems .................................................................................	247
Chapter 5-4	Secondary Circuits..................................................................................................		251
PART 6	EARTHING................................................................................................		256
Chapter 6-1	Purpose of earthing.................................................................................................		256
Chapter 6-2	Components to be Earthed in Power Networks......................................................		258
Chapter 6-3	Components to be Earthed in Electrical Equipment...............................................		262
Chapter 6-4	Components Exempt from Earthing .......................................................................		264
Chapter 6-5	Protection against Earth Faults ...............................................................................		264
Chapter 6-6	Earth Resistance Requirements of Earthing System...............................................		266
Chapter 6-7	Calculation of Earth Fault Current .........................................................................		280
Chapter 6-8	Earthing Conductors ...............................................................................................		285
Chapter 6-9	Installation Method of Earthing Systems................................................................		287
Chapter 6-10	Alternatives to Earthing Conductors ......................................................................		291
Chapter 6-11	Earthing of Mobile Electrical Equipment...............................................................		292
Annex II.2.1 (I.3A)		...............................................................................................................	294
Annex II.2.2 (I.3B) ...............................................................................................................			308
Annex II.2.3 (I.3C) ...............................................................................................................			310
Annex III.1 (II.1)..................................................................................................................			313
Annex III.3 (II.4)..................................................................................................................			315

iii

		List of Tables
Table 1	Environmental classification ..........................................................................................			2
Table 7	Minimum permissible distance between power cables ..................................................			9
Table 56	Flame resistant for construction materials and structures ............................................			21
Table 57-1	Thickness of plating and way of zinc plating...............................................................			22
Table 57-2	(Reference) Durable year of hot-dip galvanizing in the atmosphere ...........................			22
Table 57-3	(Reference) Plating attachment quantity of zinc galvanization....................................			23
Table 60	(Example) Equipment and Information used for remote control .................................			24
Table 68-1	Permissible current for copper core conductor covered with rubber			or
	PVC..............................................................................................................................			27
Table 68-2	Conductor with cooper core, rubber insulation inmetal sheath and cable
	with copper core, rubber insulation in lead cover, PVC or rubber sheath,
	with or without steel bands...........................................................................................			27
Table 68-3	Conductor with aluminum core, rubber or PVC insulation..........................................			28
Table 68-4	Cable with aluminum core, rubber or plastic insulation, lead, PVC			or
	rubber cover, with or without steel band......................................................................			28
Table 68-5	Soft cable with	cooper core, rubber insulation, movable used in
	underground mines.......................................................................................................			29
Table 68-6	Soft cable with cooper core, rubber insulation, movable use in brown coal
	enterprises ....................................................................................................................			29
Table 68-7	Soft cable with cooper core, rubber insulation, used for mobile electrical
	machines.......................................................................................................................			30
Table 68-8	Conductors with cooper core, rubber insulation, voltage of 1,3, 4kV, used
	in transport sector.........................................................................................................			30
Table 68-9	The adjustment coefficient ...........................................................................................			31
Table 68-10	Aluminum core cable with pine resin impregnated insulating paper, lead
	or aluminum cover, placed in earth ..............................................................................			31
Table 68-11	Aluminum core cable with pine resin impregnated insulating paper, lead
	cover, placed in water...................................................................................................			32
Table 68-12	Aluminum core cable with pine resin impregnated insulating paper, lead
	or aluminum cover, placed in air..................................................................................			33
Table 68-13	6kV copper 3core-	cable with common lead sheath, oil impregnated
	insulation, placed in earth and air.................................................................................			33
Table 68-14	6kV aluminum 3-core cable with common lead sheath, oil impregnated
	insulation, placed in earth and air.................................................................................			34
Table 68-15	Copper 3-core cable with separate lead sheath, oil and firesistant-		oil
	impregnated insulation paper, placed in earth, water and air .......................................			34

Table 68-16	Aluminum 3-core cable with separate lead sheath, oil and firesistant-
	oil impregnated insulation paper, placed in earth, water and air ..................................	34
Table 68-17	Copper one-core cable with oil impregnated insulation paper, lead sheath,
	without steel band, placed in air...................................................................................	35
Table 68-18	Aluminum one-core cable with oil impregnated insulation paper,	lead
	sheath, without steel band, placed in air.......................................................................	36
Table 68-19	Coefficients for case in which many cables working in parallel and placed
	in earth with or without pipe (Coefficient k)................................................................	36
Table 68-20	Coefficient a: ................................................................................................................	37
Table 68-21	Coefficient b:................................................................................................................	37
Table 68-22	Coefficient c .................................................................................................................	37
Table 68-23	Distance between blocks .............................................................................................	37
Table 69	Permissible voltage drop for indoor wiring..................................................................	38
Table 71	Economic current density.............................................................................................	39
Table 72-1	The continuous permissible currents by heating of copper, aluminum or
	steel-core-aluminum bare conductors (Permissible heating o70C at Air
	25oC) ............................................................................................................................	40
Table 72-2	Continuous permissible currents of copper or aluminum round busbars or
	pipes .............................................................................................................................	41
Table 72-3	Continuous permissible current of copper rectangular busbar.....................................	42
Table 72-5	Continuous permissible current of bronze or steel-core bronze conductor..................	43
Table 72-6	Continuous permissible current of copper or aluminum square busbar .......................	44
Table 82	Highest permissible temperature ..................................................................................	50
Table 84	Breaking characteristics of fuses..................................................................................	51
Table 85	Minimum cross-sectional area for house and outside wirings .....................................	52
Table 97	(Reference) Mechanical safety factor...........................................................................	55
Table 107	Characteristic of protective covering outer sheath.......................................................	58
Table 110	Permissible bending radius...........................................................................................	60
Table 111	(Reference) Calculation formulae of cable tension......................................................	60
Table 121	Erosion possibility........................................................................................................	64
Table 125	Fault locating equipment..............................................................................................	65
Table 127	Combination of temperature and wind pressure...........................................................	66
Table 128-1	Assumption time of use................................................................................................	66
Table 128-2	Coefficient for unequal wind pressure .........................................................................	66
Table 128-3	Conversion factor in consideration of impact of span on wind pressure......................	67

Table 128-4	Air temperature and wind pressure on design..............................................................	68
Table 128-5	Air temperature and wind pressure on checking the distance ......................................	69
Table 128-6	Coefficient of oscillation of conductors K .................................................................	70
Table 131	The color identification of conductor in circuit (IEC60204)........................................	70
Table 136	Minimum clearance between the equipment which generates arc	and
	combustibles.................................................................................................................	71
Table 137	Relationship between short circuit power factor and time constant.............................	73
Table 152	Illumination range of installation site...........................................................................	80
Table 166	Accuracy class of electrical measuring instruments.....................................................	91
Table 174	Installation methods and selection of conductors and cables with respect
	to fire safety protection conditions...............................................................................	98
Table 189	Distance from conductors near the buildings to other subjects ..................................	104
Table 194	Minimum width of working corridor .........................................................................	105
Table 205	Maximum number of connection boxes per 1 km......................................................	109
Table 213	Temperature increase of ground surrounding cable ...................................................	112
Table 216	Electrolytic protection................................................................................................	113
Table 220-1	Flame withstand time .................................................................................................	115
Table 220-2	Dimension of cable structure......................................................................................	115
Table 221-1	Minimum distance between cables in cable structures...............................................	117
Table 221-2	Minimum distances from cable rack, cable corridors to building	and
	construction structures................................................................................................	118
Table 228	Minimum distance between cable and pipeline in production hall ............................	121
Table 229-1	Depth at bottom..........................................................................................................	121
Table 229-2	Distance between underwater cables..........................................................................	122
Table 239	Ratio of tensile permissible stress to tensile breaking stress of conductor
	and lightning conductor..............................................................................................	125
Table 241	Judgment of vibration protection ...............................................................................	126
Table 246	Minimum distance between conductors with voltage up to 1kV ...............................	127
Table 251	Minimum distance between power conductor and lightning conductor ....................	132
Table 253	Installed place of lightning protection........................................................................	133
Table 258	Fault condition for single conductor ..........................................................................	135
Table 262	Standard loads of accessories and workers with installing tools................................	138
Table 272	Minimum distance from conductor in fault condition to ground ...............................	141
Table 287	Modified Bessel function ...........................................................................................	146

Table 292	Technical Class of car road ........................................................................................							150
Table 305	The example of Arc Space .........................................................................................							155
Table 312	Current reduction rate.................................................................................................							158
Table 315	Specification of the distribution board with -resistantheat (Japanese
	specification)	..............................................................................................................						159
Table 328	The Load against supporting structure.......................................................................							161
Table 330	Basic USCD and SPS.................................................................................................							161
Table 340	Minimum requirements for the installation of indoor transformers ...........................							163
Table 388	Maximum	Current	and	temperature	limits	applicable	to	loaded
	transformer exceeding nameplate rating ....................................................................							188
Table 397	Automatic fire extinguishing equipment for indoor equipment .................................							192
Table 531-1	[Reference] Outline of supervisory and control items of load						dispatch
	center system [Japanese case] ....................................................................................							248
Table 531-2	[Reference] Supervisory .............................................................Items at Substation							249
Table 548	Minimum requirements forinterconnection of low-voltage and						high-
	voltage grounding .........................................................................................systems							257
Table 554-1	Maximum ground ..........................................................................resistance of pole							260
Table 554-2	Maximum ground ..........................................................................resistance of pole							260
Table 560	Earth fault protective relay to be equipped on middle-voltage or						high-
	voltage power ......................................................................................................line							265
Table 566	Items to be considered ............................................................................in each case							267
Table 568	Material constants .....................................................................................................							275
Table 569	[Reference] Earth ..................fault current at power grid with isolated neutral point							284
Table 572-1	The smallest size ..............................of the ground wire and neutral protection wire							286
Table 572-2	Minimum size .......................................................................of grounding electrode							286

vii

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