isolation

isolation, Total:261 items.

The international standard classification for "isolation" includes: Fuses and other overcurrent protection devices , Other fluid power system components , Transformers. Reactors , Farming and forestry in general , Road transport , Textile fabrics , Switches , Microprocessor systems , Optoelectronics. Laser equipment , Vibrations, shock and vibration measurements , Irrigation and drainage equipment , Medical Sciences and health care facilities in general , Veterinary medicine , Special purpose vehicles , Characteristics and design of machines, apparatus, equipment , Livestock buildings, installations and equipment , Medical equipment , Farming and forestry , Electric traction equipment , Materials and components for shipbuilding .

The Chinese standard classification for "isolation" includes: Low-voltage distribution electrical equipment , Pharmaceutical processing machinery and equipment , Hydraulic and pneumatic device , Explosion-proof electric apparatus , Highway protection and maintenance , Transformer , Plant protection in general , Traffic control in general , Other textile articles , Industrial dust and gas prevention technology , Nuclear instrument for reactor , High voltage switchgear , Hygiene, safety and labor protection , Data information , Laser device , Basic standards and general methods , Farming machinery and tools , Medical science , Veterinary and animal husbandry, veterinary appliance , Stock and poultry raising machinery and tools , Plant quarantine, pest control , Specialized municipal automobile , Hygiene, safety and labor protection , Agriculture, forestry, husbandry and fishery construction engineering , Animal quarantine, veterinary and epidemic prevention , Surgery devices , Low voltage apparatus in general , Traffic order management , Fittings for overhead contact system , Technical management , Technical management , Marine hydraulic/pneumatic elements and accessories .

Professional Standard - Machinery

JB/T 7034-1993 Hydraulic isolating accumulator types and sizes
JB/T 10185-2008 Switch-disconnector
JB/T 58210-1999 Product Quality Grading of Hydraulic Isolation Accumulator
JB/T 7036-1993 Specifications for hydraulic isolating accumulators
JB/T 7038-1993 Hydraulic Fluid Power-insulation Type Shell of Accumulators - Technique Requirements
JB/T 8976-2006 Fuse switch disconnector
JB/T 8976-1999 Fuse-switch-disconnector
JB/T 8977-1999 Knife-disconnector and knife-change over disconnector
JB/T 8977-2006 Knife - disconnector and knife - change over disconnector
JB/T 20175-2016 Sterile isolator
JB/T 8676-1997 Plant explosion-proof low-voltage switch、isolator、isolatingswitch and fuse combination electical apparatus
JB/T 8629-2006 Switch disconnector fuse
JB/T 6437-1992 oil isolation pump
JB/T 20175-2017 Aseptic isolators
JB/T 7037-2006 Hydraulic pressure-insulation type accumulators-Test methods

Professional Standard - Traffic

JT/T 848-2013 The Compound Post for Highway Fences
JT/T 847-2013 Plastic Barrier
JT/T 374-1998 Specification for fences

General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

GB 14048.3-2008 Low-voltage switchgear and controlgear.Part 3:Switches,disconnectors,switch-disconnectors and fuse-combination units
GB/T 18691.2-2011 Agricultural irrigation equipment—Irrigation valves—Part 2:Isolating valves
GB 1985-1989 Alternating current high-voltage disconnectors and earthing switches
GB 1985-2014 High-voltage alternating-current disconnectors and earthing switches
GB 13028-1991 Isolating transformers and safety isolating transformers-Requirements
GB/T 26941.3-2011 Fences - Part 3: Welded steel wire fences
GB/T 26941.1-2011 Fences—Part 1:General rules
GB/T 26941.5-2011 Fences - Part 5: Woven steel wire fences
GB/T 1985-2023 General quality for moon cake
GB/T 13265.1-1997 Fibre optic isolators--Part 1: Generic specification
GB/T 25091-2010 High-voltage direct-current disconnectors and earthing switches
GB/T 26941.2-2011 Fences - Part 2: Posts, brace posts and gates
GB/T 8540-1987 Vibration and shock-Isolators-Procedure for specifying characteristics
GB/T 27747-2011 High-voltage alternating current disconnecting circuit-breakers for rated voltages of 72.5 kV and above
GB/T 38462-2020 Textiles－Nonwoven fabrics for isolation gowns
GB 14048.3-2002 Low-voltage switchgear and controlgear--Part 3:Switches,disconnectors,swithch-disconnectors and fuse-combination units
GB/T 23415-2009 Classification for post-entry quarantine station
GB/T 25915.7-2010 Cleanrooms and associated controlled environments—Part 7:Separative devices (clean air hoods,gloveboxes,isolators and minienvironments)
GB/T 5963-1995 Separation criteria for reactor protection system
GB/T 26941.4-2011 Fences - Part 4: Barbed steel wire fences
GB/T 16503-1996 Information technology—Galvanic isolation of balanced interchange circuits

工业和信息化部/国家能源局

JB/T 13271-2017 Power isolation sensor

Professional Standard - Hygiene

WS/T 311-2009 Technique standard for isolation in hospitals
WS/T 311-2023 Standard for isolation technique in hospitals

Professional Standard - Agriculture

NY 818-2004 Rearing isolator for pig
NY 817-2004 Operating isolator for pig
NY/T 1217-2006 Quarantine procedure of imported plant propagating materials
NY 819-2004 Rearing isolator for chicken

国家市场监督管理总局、中国国家标准化管理委员会

GB 36726-2018 Mechanical equipment on stages—Fire curtain
GB/T 25981-2021 Road separation facilities cleanout vehicle
GB/T 18691.2-2021 Agricultural irrigation equipment—Irrigation valves—Part 2: Isolating valves

Jilin Provincial Standard of the People's Republic of China

DB22/T 1212-2011 Segregation requirements for corn farming
DB22/T 1212-2018 Segregation requirements for corn farming
DB22/T 3570-2023 Digestive endoscopy isolation protocol

国家机械工业局

JB 8976-1999 Fuse type isolating switch
JB 8977-1999 Knife Isolator and Knife Conversion Isolator

Professional Standard - Commodity Inspection

SN/T 3072-2011 Rules for Post-Entry Quarantine of Plant Seed and Seeding
SN/T 1619-2005 Classfication stnadards for plant post-entry quarantine station
SN/T 2523-2010 Construction practice of temporary isolation facilities for entry fishes
SN/T 2859-2011 Protocol of the Use and Hygiene for the Isolation Premise for Imported Animals
SN/T 2032-2007 Requirement of construction of provisional quarantine facilities for imported breeding swine
SN/T 2542-2010 Rules of isolate quarantine for imported plant propagating materials
SN/T 1491-2004 Requirements of the isolation facilities for imported cattle and sheep (or goats)
SN/T 1670-2005 Protocol of quarantine and supervision for imported livestock in isolation station

Group Standards of the People's Republic of China

T/WZBF 006-2022 Electric flat gate valve (electric isolation door)
T/ZZB 3138-2023 Nonwoven fabrics for isolation gowns
T/CPIA 0014-2019 Insulation strips for photovoltaic modules
T/STIC 110077-2022 Isolated safety barrier
T/CAMDI 020-2019 Disposable rubber isolation plug for venous indwelling needle
T/YNIA 009-2022 Nonwoven fabrics for isolation gowns
T/QGCML 1581-2023 Vacuum isolation stop valve
T/STACAES 008-2021 Sanitation cleaning vehicle Road separation facilities cleanout vehicle
T/QGCML 1577-2023 Double isolation relief valve
T/ZZB 0246-2017 Isolated damping pad used in rail transit
T/HSSIA 009-2024 protective fence isolation fence

Zhejiang Provincial Standard of the People's Republic of China

DB33/T 2421-2021 Compulsory isolated drug rehabilitation professional center operating specifications
DB33/T 2176-2019 Specifications for physical rehabilitation training of compulsory isolated drug addicts
DB33/T 2177-2019 Compulsory isolated detoxification diagnosis and assessment work specification
DB3305/T 140-2020 Guidelines for the management of centralized isolation and medical observation of new coronary pneumonia
DB33/T 2420-2021 Regulations on the Administration of Compulsory Isolated Drug Rehabilitation

Jiangsu Provincial Standard of the People's Republic of China

DB32/T 4421-2022 Technical requirements for non-medical isolation gowns
DB32/T 3761.61-2022 Technical Specifications for Prevention and Control of Novel Coronavirus Pneumonia Epidemic Part 61: Community Control after Centralized Isolation Medical Observation Subjects are Released from Isolation
DB32/T 3994-2021 Inspection and Quarantine Operation Rules for Entry Aquatic Animal Isolation Field

Beijing Provincial Standard of the People's Republic of China

DB11/T 1383-2016 Technical specification for external thermal insulation and fireproof isolation belt of external wall
DB11/T 734-2010 Technical specification for rabies isolation and quarantine
DB11/ 734-2010 Technical specification for rabies isolation and quarantine
DB11/ 663-2009 Basic requirements for the construction and configuration of negative pressure isolation wards
DB11/T 734-2020 Technical specification for rabies isolation and quarantine

农业农村部

NY/T 3919-2021 Standard for the construction of animal quarantine fields

Professional Standard - Coal

MT/T 122-1985 Isolating Switch of Gm Series Coal Cutter

Professional Standard - Chemical Industry

HG/T 2331-1992 Capsules for Hydraulic Isolation Accumulators
HG/T 20515-2000 Design code for instrument seal and purge

国家煤矿安全监察局

MT 122-1985 GM series shearer isolation switch
MT/T 122.1-2019 Shearer disconnector for rated voltage up to and including 1. 14 kV

Liaoning Provincial Standard of the People's Republic of China

DB21/T 3838-2023 Hygienic Management Standards for Centralized Isolation Medical Observation Sites
DB21/T 3643-2022 Breeding Bull Transportation and Isolation Technical Regulations

Hubei Provincial Standard of the People's Republic of China

DB42/T 1526-2019 Specifications for Disinfection and Isolation of Child Welfare Institutions

Professional Standard - Medicine

YY 1885-2023 Negative pressure isolation cabin for transporting infectious disease patients
YY/T 1871-2023 Isolation gowns for medical use

中华人民共和国国家质量监督检验检疫总局、中国国家标准化管理委员会

GB/T 14048.3-2017 Low-voltage switchgear and controlgear—Part3: Switches，disconnectors，switch-disconnectors and fuse-combination units

Professional Standard - Electricity

DL/T 486-2010 High-voltage alternating-current disconnectors and earthing switches

Hebei Provincial Standard of the People's Republic of China

DB13/T 5806-2023 Energy Isolation Safety Management Specifications for Industrial and Trade Enterprises
DB13/T 5473-2021 Specifications for the establishment of isolation and closed facilities for epidemic prevention and control
DB13/T 5769-2023 Technical Guidelines for Application of Steel Wire Braided Isolation Fence

Professional Standard - Public Safety Standards

GA 370-2001 Security requirements for end-equipment isolate components
GA/T 1567-2019 Guidelines for setting traffic separate railing on urban road

Qinghai Provincial Standard of the People's Republic of China

DB63/T 1917-2021 Technical regulations for the construction of forest fire isolation belts

Professional Standard - Building Materials

JC/T 2292-2014 Rock wool products for fire barriers in buildings

Inner Mongolia Provincial Standard of the People's Republic of China

DB15/T 2146-2021 Procedures for transportation of mutton sheep and isolation of diseased sheep

Professional Standard - Energy

NB/T 20167-2012 Qualification Procedure for Isolation Valve of Pressurized Water Reactor Nuclear Power Plants

Professional Standard - Forestry

LY/T 2203-2013 Technical regulation for the construction of forest plant quarantine nursery

National Metrological Verification Regulations of the People's Republic of China

JJG(化工) 14-1989 Verification Regulations for Isolators, Inverters, and Boosters

Anhui Provincial Standard of the People's Republic of China

DB34/T 3898-2021 Rehabilitation Training Standards for Compulsory Isolated Drug Rehabilitation Personnel
DB34/T 3535-2019 Compulsory isolated drug rehabilitation center technical prevention engineering specification

Shaanxi Provincial Standard of the People's Republic of China

DB61/T 1638-2022 Code for fire safety management of square cabin isolation places
DB6111/T 181-2021 Technical Regulations for Pollination of Rapeseed Seed Production in Isolation Net Shed

海关总署

SN/T 2032-2021 Construction standards for designated quarantine facilities for imported breeding swine
SN/T 4233-2021 Construction standards for designated quarantine facilities for importedcattle/sheep/goats
SN/T 2523-2021 Construction standards for designated quarantine facilities for imported aquatic animals
SN/T 5476-2022 Requirements for construction of designed quarantine facilitiesfor imported equids
SN/T 5296-2021 Construction and configuration guide for negative pressure quarantine isolation facilities at port
SN/T 5475-2022 Construction standards for designated quarantine facilitiesfor imported breeding chiks
SN/T 2032-2019 Requirements for construction of designated quarantine facilities for imported breeding swine

Professional Standard - Railway

TB/T 3151-2007 High-voltage AC load switches for electrification railway

Taiwan Provincial Standard of the People's Republic of China

CNS 6653-1991 Hook Bars for Disconnecting Switch Operation

Professional Standard - Electron

SJ/T 31397-1994 Requirements of readiness and methods of inspection and assessment for isolating switches
SJ/Z 2924-1988 Technical guide to the optimum designing of vibration and shock isolators
SJ 51424/2-1998 Isolator, RF, microstrip, Type GW9005A, Detail specifiation for
SJ 51065/4-1996 Detail specification for Type GTP032A radio frequency coaxial isolators
SJ 51065/5-1997 Detail specification for Type GTP008A radio frequency coaxial isolators

国家能源局

NB/T 20573-2019 Commissioning technical guideline for main steam isolation valve of PWR nuclear power plant

Professional Standard-Ships

CB 1365-2002 Specifications for hydraulic accumulator with piston type separating of naval ships

Hainan Provincial Standard of the People's Republic of China

DB46/T 541-2021 Standards for compulsory isolation and treatment of tuberculosis drug addicts
DB46/T 575-2022 Work norms for the psychological correction of compulsory isolated drug addicts

Yunnan Provincial Standard of the People's Republic of China

DB53/T 1206-2023 Specifications for Physical Assessment of Female Compulsory Isolation Drug Rehabilitation Personnel
DB53/T 1205-2023 Specifications for Physical Assessment of Male Compulsory Isolation Drug Rehabilitation Personnel

Shandong Provincial Standard of the People's Republic of China

DB37/T 3612-2019 Specifications for the construction of foreign plant seedling isolation field nurseries

Sichuan Provincial Standard of the People's Republic of China

DB51/T 2774-2021 Technical specifications for home isolation during the COVID-19 epidemic

Military Standard of the People's Republic of China-General Armament Department

GJB 7175-2011 General requirements for military network secure separation and exchange products
GJB 1065-1991 General Specification for Radio Frequency Isolators

Professional Standard - Aviation

HB 8485-2014 Requirements for fault isolation in environmental control system of civil aircraft

Xinjiang Provincial Standard of the People's Republic of China

DB65/T 4555-2022 Specifications for the establishment of inpatient isolation treatment points for pulmonary tuberculosis patients

Guizhou Provincial Standard of the People's Republic of China

DB52/T 1362-2018 Dental comprehensive treatment chair isolation film protection technical regulations

Professional Standard - Construction Industry

JGJ 289-2012 Technical specification for fire barrier zone of external thermal insulation composite system on walls

未注明发布机构

UL 1577-2023 STANDARD FOR SAFETY Optical Isolators

机械工业部

JB 8629-1997 Isolating switch fuse group
JB 8676-1997 Factory explosion-proof low-voltage switches, isolators, isolation switches and fuse combination electrical appliances

PL-PKN

PN H74304-1968 Dis?ance sleeve for flanged connec?ions
PN E08105-1988 Isolating transformers and safety isolating transformers

SE-SIS

SIS SEN 24 06 30-1959 Isolation device holder, coil isolation rope
SIS SEN 24 06 21-1959 coil isolation device, star isolation device
SIS SS 427 02 03-1989 Safety for isolating transformers and safety isolating transformers
SIS SEN 24 06 97-1958 Fixture for isolating equipment, round isolator spiral rod IR10
SIS SEN 24 06 90-1958 Isolation equipment fixture, round isolator tie-down IR10
SIS SEN 30 03 06 electrical shutdown isolation
SIS SEN 24 11 31-1972 Line material. Partitition arm
SIS SEN 24 06 96-1961 Isolation equipment fixture, fork fixture, round isolator IR10
SIS SEN 24 06 25-1958 Ring isolator, IR10
SIS SEN 24 06 31-1959 Linstropp

CENELEC - European Committee for Electrotechnical Standardization

EN 60742:1989 Isolating Transformers and Safety Isolating Transformers - Requirements
EN 60742:1995 Isolating Transformers and Safety Isolating Transformers Requirements

Korean Agency for Technology and Standards (KATS)

KS C 4502-1999(2011) Disconnecting switches
KS W 5111-2019 Isolated transformers
KS W 5111-2016 ISOLATED TRANSFORMERS
KS W 5111-1993 ISOLATED TRANSFORMERS
KS C 4809-2000 Sectionalizer
KS V 7141-1998 Distance pieces for ship's hull
KS B 1563-2003(2018) Anti-vibration spring mount
KS K 0790-1997 TESTING METHOD OF HEAT INSULATING CHARACTERISTICS OF BEDDING

Underwriters Laboratories (UL)

UL 1577-1989 Optical isolators
UL 1577-1995 Optical isolators
UL 1577-2000 UL Standard for Safety Optical Isolators Fourth Edition

Spanish Association for Standardization (UNE)

UNE-EN 60742:1996 ISOLATING TRANSFORMERS AND SAFETY ISOLATING TRANSFORMERS. REQUIREMENTS.
UNE 20-100-1990 High voltage industrial equipment, isolators, AC grounding isolators
UNE-EN 16447:2014 Explosion isolation flap valves (Endorsed by AENOR in December of 2014.)
UNE-EN 1299:1997+A1:2009 Mechanical vibration and shock - Vibration isolation of machines - Information for the application of source isolation

US-FCR

FCR FED H-08-4 VOL 3 SEC II 673.0-1988 ISOLATION ROOM HVAC
FCR FED H-08-4 VOL 4-E-IP-2-1988 ISOLATED POWER PANEL
FCR FED H-08-1 SEC 16675-2001 ISOLATED POWER SYSTEMS
FCR VA 26 20 11-2010 ISOLATED POWER SYSTEMS
FCR FED H-08-4 VOL 4-E-IP-1-1988 ISOLATED POWER PANEL (TYPICAL)

YU-JUS

JUS N.H8.023-1987 Isolating transformers and safety isolating transformers. Safety isolating transformers for general use. Additional reguirements
JUS N.H8.021-1987 Isolating and safety isolating transformers. Bell transformers. Additional reguirements
JUS N.H8.010-1987 Isolating transformers and safety isolating transformers. General reguirements and testings
JUS U.J6.151-1982 Standard values for sound isolation criterion
JUS N.H8.024-1987 Isolating transformers and safety isolating transformers. Isolating transformers for general use, shaver transformers and shaver supply units. Additional reguirements
JUS N.H8.020-1987 Isolating transformers and safety isolating transformers. Transformers for toys. Additional requirements

SCC

CAN2-38.39-1977 Gown, Isolation
CAN/CSA-E742-1994(R2009) Isolating transformers and safety isolating transformers - Requirements
IEC 60129:1975 Alternating current disconnectors (isolators) and earthing switches
CAN/CGSB 82.5-M88-1988 Insulated steel doors
BS 3535-1:1990 Isolating transformers and safety isolating transformers-General requirements
IEC 60742:1983/AMD1:1992 Amendment 1 - Isolating transformers and safety isolating transformers. Requirements
CAN 2-38.39-M79-1979 Gown, Isolation, Polyester/Cotton
DANSK DS/EN 16447:2014 Explosion isolation flap valves
DANSK DS/EN 15089:2009 Explosion isolation systems
CSA C22.2 No.58-M1989-1989(R2010) High-Voltage Isolating Switches
NS-EN 16447:2014 Explosion isolation flap valves
NS-EN 15089:2009 Explosion isolation systems
NS-EN 1299:1997+A1:2008 Mechanical vibration and shock — Vibration isolation of machines — Information for the application of source isolation
AENOR UNE-EN 1299+A1:2009 Mechanical vibration and shock - Vibration isolation of machines - Information for the application of source isolation
MIL MIL-DTL-28791/1C-2011 Isolators, Radio Frequency, Coaxial
CSA C22.2 No.204-2017(R2022) Line isolation monitors
MIL MIL-DTL-28791/1D-2016 Isolators, Radio Frequency, Coaxial
CSA C22.2 No.204-M1984-1984(R2013) Line Isolation Monitors
BS 3535-2:1990 Isolating transformers and safety isolating transformers-Specification for transformers for reduced system voltage
CAN/CGSB 12.8-1997 Vitrages isolants
CAN/CSA-C22.2 No.4-2004(C2014) Interrupteurs sous boîtier et pour panneau isolant
DIN EN 15089 E:2007 Draft Document - Explosion Isolation Systems; German version prEN 15089:2007
12/30267131 DC BS EN 16447. Explosion isolation flap valves
04/30125922 DC EN 15089. Explosion isolation systems
CAN/CGSB-12.8-2017(C2022) Vitrages isolants
CAN/CGSB 12.8-M90-1990 Glass insulating panels
DIN EN 16447 E:2012 Draft Document - Explosion isolation flap valves; German version prEN 16447:2012
BS 5253:1975 Specification for a.c. disconnectors (isolators) and earthing switches of rated voltage above 1 kV

British Standards Institution (BSI)

BS EN 60742:1996 Isolating transformers and safety isolating transformers - Requirements
BS ISO 22762-5:2021 Elastomeric seismic-protection isolators. Sliding seismic-protection isolators for buildings
BS EN 17098-1:2018 Plastics. Barrier films for agricultural and horticultural soil disinfection by fumigation - Specifications for barrier films

Association Francaise de Normalisation

NF C52-742:1997 Isolating transformers and safety isolating transformers. Requirements.
NF EN ISO 9229:2020 Isolation thermique - Vocabulaire
NF S66-406*NF EN 15089:2009 Explosion isolation systems
NF EN 15089:2009 Systèmes d'isolement d'explosion
NF EN 61858-1:2014 Systèmes d'isolation électrique - Évaluation thermique des modifications apportées à un système d'isolation électrique éprouvé - Partie 1 : système d'isolation électrique (SIE) à enroulements à fils
NF EN 1299+A1:2009 Mechanical vibrations and shocks - Vibration isolation of machines - Information for implementing source isolation
NF EN 1299/IN1:2009 Mechanical vibrations and shocks - Vibration isolation of machines - Information for implementing source isolation

CU-NC

NC 09-41-1968 Spacer pin for dies

GM Holden Ltd

HOLDEN HN 1631-1996 Wax Barrier Coating

NL-NEN

NEN 7051-1981 Gypsum partition blocks

International Electrotechnical Commission (IEC)

IEC 60742:1983 Isolating transformers and safety isolating transformers - Requirements
IEC 60742/AMD1:1992 Isolating transformers and safety isolating transformers; requirements; amendment 1

RU-GOST R

GOST 30030-1993 Isolating transformers and safety isolating transformers. Technical requirements

PT-IPQ

NP 1889-1986 Sound category. Close isolation method and isolation method from external noise

American National Standards Institute （ANSI)

ANSI/ADA 108-2009 Amalgam Separators

Defense Logistics Agency

DLA A-A-52217 B-2006 TRAY, MESS, COMPARTMENTED
DLA MIL-DTL-28791/1 C-2011 ISOLATORS, RADIO FREQUENCY, COAXIAL

German Institute for Standardization

DIN EN 16447:2014-09 Explosion isolation flap valves; German version EN 16447:2014
DIN EN 15089:2009-07 Explosion isolation systems; German version EN 15089:2009
DIN EN 1299:2009-02 Mechanical vibration and shock - Vibration isolation of machines - Information for the application of source isolation; German version EN 1299:1997+A1:2008 / Note: DIN EN 1299 (1997-05) remains valid alongside this standard until 2009-12-28.

Danish Standards Foundation

DS/INF 152/Bil.1:2004 Distances for installation of pipes for isolation
DS/INF 152:2004 Distances for installation of pipes for isolation
DS/EN 1299+A1:2009 Mechanical vibration and shock - Vibration isolation of machines - Information for the application of source isolation

Japanese Industrial Standards Committee (JISC)

JIS C 5932-3:2018 Optical isolators -- Part 3: Non-connectorized single-mode fiber optic isolators
JIS C 5933:2012 Test methods of optical isolators

Standard Association of Australia （SAA）

AS 3108.2:1984 Approval and test specification - Isolating transformers and safety isolating transformers, Part 2: Supplementary requirements - Isolating transformers
AS 3108.3:1984 Approval and test specification - Isolating transformers and safety isolating transformers, Part 3: Supplementary requirements - Safety isolating transformers