GB 4793-2024 PDF English
US$935.00 · In stock · Download in 9 secondsGB 4793-2024: Safety technical specification for electrical equipment for measurement, control and laboratory use Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB 4793: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 4793-2024 | English | 935 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Safety technical specification for electrical equipment for measurement, control and laboratory use
| Valid |
| GB 4793.1-2007 | English | 405 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Safety requirements for electrical equipment for measurement, control, and laboratory use -- Part 1: General requirements
| Valid |
| GB 4793.1-1995 | English | RFQ |
ASK
|
8 days
|
Safety requirements for electrical equipment for measurement, control, and laboratory use. Part 1: General requirements
| Obsolete |
| GB 4793-1984 | English | RFQ |
ASK
|
9 days
|
Safety requirements for electronic measuring apparatus
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB 4793-2024
GB 4793-2024: Safety technical specification for electrical equipment for measurement, control and laboratory use
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB4793-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.080; 71.040.10
CCS N 20; N 61
Partially replacing GB 4793.1-2007
Safety technical specification for electrical equipment for
measurement, control and laboratory use
Issued on. OCTOBER 28, 2024
Implemented on. NOVEMBER 01, 2026
Issued by. Status Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword... 4
Introduction... 5
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 7
4 Environmental conditions... 7
5 Marking and documents... 8
6 Protection against electric shock... 15
7 Protection against mechanical hazards... 33
8 Mechanical stress resistance... 38
9 Prevention of flame spread... 38
10 Temperature limits and heat resistance of equipment... 45
11 Protection against hazards of fluids and solid foreign matter... 46
12 Protection against radiation (including laser sources), sound pressure, ultrasonic
pressure... 48
13 Protection against released gases and substances, explosions and implosions... 51
14 Components and assemblies... 52
15 Protection by interlocking devices... 54
16 Test method... 54
Appendix A (Normative) Insulation requirements not covered in 6.6... 56
References... 76
1 Scope
This document specifies the safety requirements for electrical equipment for
measurement, control and laboratory use, such as marking and documents, protection
against electric shock, protection against mechanical hazards, resistance to mechanical
stress, prevention of flame spread, temperature limits and heat resistance of equipment,
protection against the hazards of fluids and solid foreign matter, protection against
radiation (including laser sources) and sound pressure and ultrasonic pressure,
protection against released gases and substances, explosions and implosions,
components and assemblies, protection using interlocking devices.
This document applies to the design, production, inspection, use of electrical equipment
for measurement, control, laboratory use (including industrial automation equipment).
2 Normative references
The contents of the following documents constitute essential clauses of this document
through normative references in the text. Among them, for referenced documents with
dates, only the versions corresponding to the dates apply to this document; for
referenced documents without dates, the latest versions (including all amendments)
apply to this document.
GB/T 4025 Basic and safety principles for man-machine interface, marking and
identification - Coding principles for indicators and actuators
GB/T 4208 Degrees of protection provided by enclosure (IP code)
GB/T 5169.16 Fire hazard testing for electric and electronic products - Part 16.Test
flames -5 0 W horizontal and vertical flame test methods
GB/T 7247.1 Safety of laser products - Part 1.Equipment classification and
requirements
GB/T 19661 (all parts) Safety requirements for nuclear instrumentations and
systems
3 Terms and definitions
The terms and definitions defined in GB/T 42125.1-2024 apply to this document.
4 Environmental conditions
4.1 Normal environmental conditions
The equipment shall be designed to be safe for use under at least the following conditions.
4.2 Extended environmental conditions
The equipment shall be designed to be safe not only for use under the environmental
conditions specified in 4.1, but also for use under the following rated conditions
specified by the equipment manufacturer.
5 Marking and documents
5.1 Marking
5.1.1 General
The equipment shall be marked with markings in accordance with the provisions of
5.1.2 ~ 5.2.In addition to the markings on internal parts, these markings shall be visible
from the outside, or, if the cover or door is intended to be removed or opened by the
operator, these markings shall be visible from the outside after the cover is removed or
the door is opened without tools. Marks applicable to the entire equipment shall not be
marked on parts that can be removed by the operator without tools.
5.1.2 Identification
The equipment shall be marked with at least the following.
5.1.3 Power supply
The equipment shall be marked with the following information.
5.1.4 Fuse
Any fuse that can be replaced by the operator shall be marked next to its fuse holder, to
enable the operator to identify the correct replacement fuse.
5.1.5 Terminals, connectors and operating devices
5.1.6 Switches and circuit breakers
If a power switch or circuit breaker is used as a disconnect device, the "off" position
shall be clearly marked.
5.1.7 Equipment protected by double insulation or reinforced insulation
Equipment that is only partially protected by double insulation or reinforced insulation
shall not be marked with the symbol of No.10 in Table 1.
5.1.8 Field wiring terminal box
Under normal conditions, at an ambient temperature of 40 °C, or at the maximum rated
ambient temperature (if higher than 40 °C), if the temperature of the terminals or
enclosure of the field wiring box or junction box exceeds 60 °C, there shall be a sign to
warn the installer to refer to the installation instructions when determining the
temperature rating of the cable connected to the terminal. The sign shall be visible
before or during connection; or the sign shall be marked near the terminal.
5.2 Warning signs
Warning signs are visible when the equipment is in normal use. If a warning sign applies
to a specific part of the equipment, it shall be marked on or near that specific part.
The dimensions of the warning sign shall be as follows.
5.3 Durability of markings
The required markings shall remain legible under normal conditions of use and shall
withstand the effects of cleaning agents specified by the manufacturer.
5.4 Documentation
5.4.1 General
For safety purposes, the following documentation shall be provided with the equipment
as required by the operator and responsible personnel. It shall be ensured that the service
personnel authorized by the manufacturer have access to the safety-related documents
they need.
5.4.2 Equipment rating
The documentation shall contain the following.
5.4.3 Equipment installation
The documentation shall include installation and specific commissioning instructions,
and, if necessary for safety, warnings of hazards arising during the installation and
commissioning of the equipment or due to improper installation or commissioning of
the equipment. Such information (if applicable) includes.
5.4.4 Equipment operation
The instructions for use shall include, where applicable.
6 Protection against electric shock
6.1 General
The equipment shall be protected against electric shock under normal conditions and
single fault conditions; accessible parts shall not be dangerously charged. The voltage,
current, charge or energy between accessible parts and ground or between any two
accessible parts within 1.8 m on the same part of the equipment (along the surface or
through the air) shall not exceed the limits under normal conditions in 6.3.1, nor the
limits under single fault conditions in 6.3.2.
6.2 Exceptions
If it is impossible to prevent the following parts from being both accessible and
hazardous live due to operational reasons, it is allowed that these parts are accessible to
operators in normal use when they are hazardous live.
6.3 Limits for accessible parts
6.3.1 Limits under normal conditions
If the measured voltage exceeds the limit in a), meanwhile the other measured values
are greater than the limits in b) or c) below, it is considered to be hazardous live.
6.4 Primary protection measures
6.4.1 Enclosure and protective shield
If the enclosure or protective shield is provided by insulation, they shall meet the
requirements of basic insulation.
6.4.2 Basic insulation
The electrical gaps, creepage distances, solid insulation that form basic insulation shall
meet the requirements of 6.6.
6.4.3 Impedance
The impedance used for primary protective measures shall meet all of the following requirements.
6.5 Additional protective measures under single fault conditions
6.5.1 Protective connections
6.5.1.1 General
Accessible conductive parts shall be connected to the protective conductor terminals if
they could become hazardous live in the event of a single fault in the primary protective
measures specified in 6.4, or they shall be isolated from hazardous live parts by a
conductive protective screen connected to the protective conductor terminals.
6.5.2 Additional insulation
Gaps, creepage distances and solid insulation forming additional insulation shall meet
the applicable requirements of 6.6.
6.5.3 Reinforced insulation
Gaps, creepage distances and solid insulation forming reinforced insulation shall meet
the applicable requirements of 6.6.
6.5.4 Protective impedance
The protective impedance shall limit the current and voltage to the limits of 6.3.1 under
normal conditions and to the limits of 6.3.2 under single fault conditions.
6.6 Insulation requirements
6.6.1 Nature of insulation
6.6.3 Insulation of secondary circuits supplied by a mains power circuit of
overvoltage category II not exceeding 300 V
6.6.3.1 General
In this document, the isolation of secondary circuits from the mains power circuit is
achieved by a transformer. Inside the transformer, the primary and secondary windings
are separated by reinforced insulation, double insulation or a shield connected to the
protective conductor terminal.
7 Protection against mechanical hazards
7.1 General
Operation under normal conditions or single fault conditions that are not easily detected
shall not result in mechanical hazards. Mechanical hazards include, but are not limited to.
7.2 Sharp edges
All accessible parts of the equipment shall be smooth and free of edges, to prevent
injury during normal use of the equipment.
7.3 Moving parts
7.3.1 General
The hazard caused by moving parts shall not exceed the permissible level except as
specified in 7.3.2.The conditions specified in 7.3.4 and 7.3.5 are considered to be
permissible limits.
7.3.4 Limits of pressure
The following limits shall be met under normal conditions and single fault conditions.
The maximum permissible continuous contact pressure is 50 N/cm2 and the maximum
pressure is 150 N.
7.3.5 Gap limits between moving parts
7.3.5.1 Gap limits between moving parts - Normal access allowed
If a body part can be inserted between moving parts and the forces and pressures of the
moving parts exceed the limits of 7.3.4, the width of the gap shall not be reduced from
greater than the minimum gap value for the body part in Table 9 to less than the
minimum gap value under normal conditions and single fault conditions.
7.4 Stability
Equipment and components of equipment that are not fixed to the building structure
before operation shall be physically stable during normal use.
If measures are provided to ensure that the operator can maintain the stability of the
equipment after operations such as pulling out a drawer, these measures shall be
automatic or shall be marked with a warning sign to use the measures.
7.5 Lifting and carrying devices
7.5.1 General
Equipment or parts with a mass greater than or equal to 18 kg shall be equipped with
lifting and carrying devices or shall be described in the manufacturer's documentation.
7.5.2 Handles and handlebars
If handles or handlebars for carrying are installed on or provided with the equipment,
they shall be able to withstand a force of 4 times the weight of the equipment.
7.5.3 Lifting devices and supporting parts
Parts of lifting devices and parts supporting heavy objects shall have a rated maximum
load or be tested to pass 4 times the maximum static load.
7.6 Wall mounting
For equipment intended to be mounted on a wall or ceiling, the bracket shall be able to
withstand a force of 4 times the weight of the equipment.
7.7 Flying parts
If a part fails and flies apart, the equipment shall be able to control or limit the energy
of the part that may cause a hazard.
8 Mechanical stress resistance
The equipment shall not cause a hazard when subjected to mechanical stresses that may
be encountered in normal use. The normal required energy protection level is 5 J. Less
than 5 J but not less than 1 J is also allowed when the following criteria are met.
9 Prevention of flame spread
9.1 General
Under normal conditions or single fault conditions, the flame shall not spread to the
outside of the equipment. See Figure 7 for a flow chart of the requirements for
preventing flame spread.
9.2 Eliminate or reduce ignition sources for equipment
The possibility of ignition and the incidence of fire are considered to be reduced to an
acceptable level, if all of the following requirements are met.
9.3 Once a fire occurs, contain the flame within the equipment
9.3.1 General
The possibility of the flame spreading outside the equipment is considered to be reduced
to an acceptable level, if the equipment meets one of the following structural
requirements.
9.3.2 Structural requirements
Comply with the following structural requirements.
9.4 Energy-limited circuits
Energy-limited circuits are circuits that meet all of the following criteria.
9.6 Overcurrent protection
9.6.1 General
Equipment intended to be powered by the mains supply shall be protected by fuses,
circuit breakers, thermal cut-outs, impedance limiting circuits or similar devices, to
prevent excessive energy from being drawn from the mains, in the event of a fault in
the equipment.
9.6.2 Permanently connected equipment
Overcurrent protection devices in permanently connected equipment are optional. If the
equipment is not equipped with overcurrent protection devices, the characteristics of
the overcurrent protection devices required in the building facilities shall be specified
in the equipment installation instructions.
9.6.3 Other equipment
If overcurrent protection devices are used, they shall be installed inside the equipment.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
Tips & Frequently Asked QuestionsQuestion 1: How long will the true-PDF of English version of GB 4793-2024 be delivered?Answer: The full copy PDF of English version of GB 4793-2024 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice. Question 2: Can I share the purchased PDF of GB 4793-2024_English with my colleagues?Answer: Yes. The purchased PDF of GB 4793-2024_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB 4793-2024 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds. Question 5: Should I purchase the latest version GB 4793-2024?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB 4793-2024 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. How to buy and download a true PDF of English version of GB 4793-2024?A step-by-step guide to download PDF of GB 4793-2024_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).
Step 2: Search keyword "GB 4793-2024".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9
|