GB/T 3797-2016 PDF English
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GB/T 3797-2016: PDF in English (GBT 3797-2016) GB/T 3797-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.240.30
K 62
Replacing GB/T 3797-2005
Electrical control assemblies
ISSUED ON: FEBRUARY 24, 2016
IMPLEMENTED ON: SEPTEMBER 01, 2016
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
National Standardization Administration.
Table of Contents
Foreword ... 4
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Marking, packaging, transportation ... 7
4.1 Marking... 7
4.2 Packaging ... 8
5 Conditions of use ... 8
5.1 Normal conditions of use ... 8
5.2 Special conditions of use ... 10
5.3 Transportation, storage, installation conditions ... 11
6 Technical requirements ... 11
6.1 Performance indicators ... 11
6.2 Strength of materials and components ... 12
6.3 Housing protection level ... 14
6.4 Clearance and creepage distance ... 14
6.5 Protection ... 16
6.6 Selection and installation of components ... 23
6.7 Internal circuits and connections ... 24
6.8 Cooling ... 25
6.9 Terminals for external conductors ... 26
6.10 Dielectric properties ... 28
6.11 Temperature rise limits ... 29
6.12 Short-circuit protection ... 31
6.13 Electromagnetic compatibility (EMC) ... 31
7 Verification ... 31
7.1 General... 31
7.2 General inspection ... 32
7.3 Strength of materials and components ... 33
7.4 Housing protection level ... 34
7.5 Clearance and creepage distance ... 35
7.6 Electric shock protection and protection circuit integrity ... 35
7.7 Selection and installation of components ... 35
7.8 Internal circuits and connections ... 35
7.9 External conductor terminals ... 36
7.10 Power-on operation ... 36
7.11 Continuous operation ... 36
7.12 Electrical performance ... 37
7.13 Dielectric properties ... 39
7.14 Temperature rise ... 39
7.15 Electromagnetic compatibility ... 40
7.16 Noise ... 40
7.17 Drop ... 41
7.18 Climate environment test ... 41
Electrical control assemblies
1 Scope
This standard specifies the terms and definitions, conditions of use, basic requirements
for design, manufacture, testing of electrical control assembly.
This standard applies to electrical control assembly (hereinafter referred to as electrical
control assembly or equipment), which has a rated voltage of not more than 1000 V AC
or a rated voltage of not more than 1500 V DC.
This standard applies to electrical control assembly with or without electronic devices.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 156-2007 Standard voltage
GB/T 762-2002 Standard current ratings
GB/T 2423.4-2008 Environmental testing for electric and electronic products - Part
2: Test method - Test Db: Damp heat, cyclic (12 h + 12 h cycle)
GB/T 2423.10-2008 Environmental testing - Part 2: Test methods - Test Fc:
Vibration (sinusoidal)
GB/T 3047.1-1995 Series of basic dimensions of panels, rack and cabinets for
vertical increment of 20 mm
GB/T 3859.1-2013 Semiconductor converters - General requirements and line
commutated Converters - Part 1-1: Specification of basic requirements
GB/T 4025-2010 Basic and safety principles for man-machine interface, marking
and identification - Coding principles for indicators and actuators
GB/T 4026-2010 Basic and safety principles for man-machine interface, marking
and identification - Identification of equipment terminals and of conductor
terminations
shall be clearly specified in the relevant product technical documents. Electrical
performance verification shall be carried out in accordance with 7.12.
6.1.3 Load level
The load level of the equipment shall be selected in accordance with GB/T 3859.1; it
may also be specified separately in the product technical documents.
6.1.4 Noise
The noise generated by the equipment during normal operation shall be no more than
70 dB (A sound level), when measured by a sound level meter.
Note: For equipment that does not require frequent operation and monitoring, the noise value
can be higher than the above value after agreement between the manufacturer and the user.
Noise verification shall be carried out in accordance with 7.16.
6.2 Strength of materials and components
6.2.1 General requirements
Electrical control assembly shall be made of materials that can withstand mechanical
stress, electrical stress, thermal stress, environmental pressure generated under
specified conditions of use.
The shape of the housing of the electrical control assembly shall be adapted to its
purpose; the dimensions shall comply with the provisions of GB/T 3047.1. The housing
of the electrical control assembly can be made of different materials, such as: insulating,
metal or a combination of these materials. Anti-loosening measures shall be taken at
each fastening point.
The installation dimensions of the foundation fixing installation holes of the electrical
control assembly shall meet the requirements of the product manufacturing drawings.
The door of the cabinet (table) shall be able to be opened and closed flexibly within an
angle of not less than 90°.
6.2.2 Corrosion protection
Considering the normal use conditions (see 5.1), in order to ensure corrosion protection,
the electrical control assembly shall be made of suitable materials or coated with
protective layers on the exposed surfaces. All ferrous metal parts shall have reliable
protective layers. Corrosion resistance shall be verified according to 7.3.1.
6.2.3 Insulating material properties
6.2.3.1 Thermal stability
For the housing or housing parts of insulating materials, the thermal stability shall be
verified according to 7.3.2.
6.2.3.2 Heat and fire resistance of insulating materials
The original manufacturer shall select insulating materials either by reference to the
insulation temperature index (for example, determined by the method of IEC 60216) or
in accordance with the provisions of IEC 60085.
Insulating materials for parts necessary to fix and maintain current-carrying parts in the
normal use position and parts exposed to thermal stress due to internal electrical effects
shall not be subject to the harmful effects of abnormal heating and fire, as the loss of
insulating parts may affect the safety of the electrical control assembly; it shall be
verified by the glow wire test in 7.3.2. When performing this test, the protective earthing
(PE) is not considered as a current-carrying part.
For small parts (surface area dimensions not exceeding 14 mm × 14 mm), alternative
test methods may be used (e.g. needle flame test according to GB/T 5169.5). The same
steps can be applied, when the metal material of the component is larger than the
insulating material.
6.2.4 Resistance to ultraviolet radiation
For housings and housing parts made of insulating materials for outdoor use, ultraviolet
radiation resistance shall be verified in accordance with 7.3.3.
6.2.5 Mechanical strength
All housings or partitions, including door locking devices and hinges, shall have
sufficient mechanical strength, to withstand the stresses encountered in normal use and
short-circuit conditions.
The mechanical operation of movable parts, including all plug-in interlocks, shall be
verified in accordance with the test of 7.3.4.
6.2.6 Vibration
The electrical control assembly shall have a certain ability to withstand vibration and
shall be verified in accordance with the test of 7.3.5.
6.2.7 Lifting device
If necessary, the electrical control assembly shall be equipped with a suitable lifting
device for lifting. Check according to the test of 7.3.6.
6.3 Housing protection level
6.3.1 Protection against mechanical collision
When the manufacturer of the electrical control assembly declares the protection level
of the mechanical collision protection of the housing of the electrical control assembly,
it shall comply with the provisions of GB/T 20138 and be verified according to the test
of 7.4.
6.3.2 Protection against contact with live parts and the ingress of solid foreign
objects and water
According to GB 4208, the protection level provided by the electrical control assembly
against contact with live parts and the ingress of solid foreign objects and water is
indicated by the IP code and verified according to 7.4.
The housing protection level of the electrical control assembly shall be clearly specified
in the product technical conditions. After the electrical control assembly is installed
according to the manufacturer's instructions, the protection level shall be at least IP2X.
Unless otherwise specified, the protection level given by the electrical control assembly
manufacturer shall apply to the entire electrical control assembly.
If different parts of the electrical control assembly have different protection levels, the
equipment manufacturer shall mark the protection level of that part separately.
6.4 Clearance and creepage distance
6.4.1 General
The highest voltage rating data shall be used to determine the clearance and creepage
distance between circuits (clearance is based on the rated impulse withstand voltage,
creepage distance is based on the rated insulation voltage).
Clearance and creepage distance apply to phase-to-phase, phase-to-neutral, phase-to-
ground and neutral-to-ground, except for direct grounding of conductors.
6.4.2 Electrical clearance
The electrical clearance shall be sufficient, to withstand the rated impulse withstand
voltage (Uimp) declared by the circuit. The electrical clearance shall be the specified
value in Table 1, except for the case where the impulse withstand voltage design
verification and routine inspection are carried out in accordance with 10.9.3 and 11.3
of GB 7251.1-2013, respectively.
Hazardous live parts shall be completely covered with insulation; the insulation can
only be removed after being damaged or using tools.
Insulation shall be made of materials that can withstand the mechanical, electrical,
thermal stresses that may occur during use.
Note: For example, electrical components and insulated wires wrapped with insulation.
Color paint, varnish, enamel alone cannot meet the requirements of basic insulation.
6.5.1.1.3 Baffle or housing
Live parts insulated with air shall be placed in an housing or behind a baffle that
provides at least IPXXB protection.
The protection level of the horizontal top surface of the housing, that is not more than
1.6 m above the installation ground and can be touched, shall be at least IPXXD.
Taking into account external influences, under normal working conditions, baffles and
housings shall be reliably fixed in their positions and have sufficient stability and
durability, to maintain the required protection level, and properly isolate from live parts.
The distance between the conductive baffle or housing and the live parts shall not be
less than the electrical clearance and creepage distance specified in 6.4.
When it is necessary to move the baffle, open the housing or remove the parts of the
housing, one of the conditions a) ~ c) shall be met:
a) Use a key or tool, that is, only with the help of an instrument can the door, cover
or interlock be opened;
b) In the case of basic protection provided by the baffle or housing, when the power
supply is isolated from the live parts, the power supply can only be restored after
the baffle or housing is replaced or reset;
c) The protection level against contact with live parts provided by the intermediate
baffle is at least IPXXB; this baffle can only be moved when a key or tool is used.
6.5.1.2 Fault protection
6.5.1.2.1 Requirements for protective conductors to facilitate automatic power off
6.5.1.2.1.1 General
Each electrical control assembly shall have a protective conductor, to facilitate
automatic power off:
a) To prevent the consequences of internal faults in the electrical control assembly
(e.g., damage to basic insulation);
b) To prevent the consequences of external circuit faults that supply power to the
electrical control assembly (e.g., damage to basic insulation).
See 6.5.1.2.1.2 and 6.5.1.2.1.3 for specific requirements.
See 6.7.2 for identification requirements of protective conductors (PE, PEN).
6.5.1.2.1.2 Requirements for protection against consequences caused by internal
faults in electrical control assembly provided by grounding continuity
All exposed conductive parts of electrical control assembly shall be connected together
and connected to the power supply protective conductor, or connected to the grounding
device through a grounding conductor.
This connection can be achieved by metal screws, welding or other conductor
connections, or by a separate protective conductor.
Note: For metal parts of electrical control assembly using wear-resistant coatings, such as
powder-coated sealing plates, the protective earth connection requires removal or penetration
of the coating.
The method for verifying the earthing continuity between the exposed conductive parts
of the electrical control assembly and the protective circuit is specified in 7.6.
For the continuity of these connections, the following shall apply:
a) When a part of the electrical control assembly is removed, such as for routine
maintenance, the protective circuit (grounding continuity) of the remaining parts
of the electrical control assembly shall not be interrupted.
If the precautions taken can ensure permanent good conductivity, the assembly
of the various metal parts of the electrical control assembly is considered to be
able to effectively ensure the continuity of the protective circuit.
Unless designed for this purpose, soft or pliable metal conduits shall not be used
as protective conductors.
b) On covers, doors, shutters and similar parts, if no electrical devices exceeding the
extra low voltage limit (ELV) are installed, the usual metal screw connections and
metal hinge connections are considered to be sufficient to ensure continuity.
If components such as covers, doors, shutters, etc. are equipped with devices with
voltage values exceeding the extra low voltage limit (ELV), additional measures shall
be taken to ensure grounding continuity. These components shall be equipped with a
protective conductor (PE) in accordance with Table 3, the cross-sectional area of which
depends on the maximum rated operating current Ie of the device. Alternatively, if the
rated working current of the device is less than or equal to 16 A, a specially designed
When the continuity of the protective circuit is cut off by using a connector or plug and
socket device, the protective circuit can only be interrupted when the live object is no
longer energized; before the live object is re-energized, the continuity of the protective
circuit shall be restored.
If the structural components, frames, housings, etc. in the electrical control assembly
are made of conductive materials, the protective conductor does not need to be insulated
from these components.
For PEN conductors, the following additional requirements apply:
- The minimum cross-sectional area shall be 10 mm2 for copper or 16 mm2 for
aluminum;
- The cross-sectional area of the PEN conductor shall not be less than the required
cross-sectional area of the neutral conductor;
- The PEN conductor does not need to be insulated in the electrical control assembly;
- Structural components shall not be used as PEN conductors, but copper or
aluminum mounting rails can be used as PEN conductors.
6.5.1.2.2 Electrical isolation
The electrical isolation of each circuit is used to prevent electric shock caused by
contact with exposed conductive parts, due to damage to the basic insulation of the
circuit.
This type of protection is shown in Appendix K of GB 7251.1-2013.
6.5.1.3 Full insulation protection
For full insulation basic protection and fault protection, the following requirements
shall be met:
a) The components shall be completely enclosed with double or reinforced insulating
materials. The housing shall be marked with the symbol "回" that is easily visible
from the outside.
b) There shall be no part on the housing, where the fault voltage may be led out of
the housing due to the penetration of conductive parts.
That is, for metal parts, such as the shaft of the operating mechanism that must
be led out of the housing for structural reasons, the inside or outside of the
housing shall be insulated from the live parts according to the maximum rated
insulation voltage and the maximum rated impulse withstand voltage of all
circuits in the electrical control assembly.
If the operating mechanism is made of metal (regardless of whether it is covered
with insulating material), the operating mechanism shall have insulation rating
data for the maximum rated insulation voltage and the maximum rated impulse
withstand voltage of all circuits in the electrical control assembly.
If the operating mechanism is mainly made of insulating material, if any metal
part of it becomes accessible in the event of an insulation fault, it shall also be
insulated from the live parts according to the maximum rated insulation voltage
and the maximum rated impulse withstand voltage of all circuits in the electrical
control assembly.
c) When the electrical control assembly is ready to be put into operation and
connected to the power supply, the housing shall enclose all live parts, exposed
conductive parts, parts attached to the protection circuit to prevent them from
being touched. The protection level provided by the housing shall be at least
IP2XC (see GB 4208).
If the protective conductor passes through the electrical control assembly with
insulated exposed conductive parts and extends to the electrical equipment
connected to the load end of the electrical control assembly, the electrical control
assembly shall be equipped with terminals for connecting the external protective
conductor and identified with appropriate markings.
Inside the housing, the protective conductor and its terminals shall be insulated
from the live parts; the exposed conductive parts shall be insulated from the live
parts in the same way.
d) The exposed conductive parts inside the electrical control assembly shall not be
connected to the protective circuit, that is, the exposed conductive parts shall not
be included in the protective measures used for the protective circuit. This also
applies to the built-in electrical components, even if they have terminals for
connecting the protective conductor.
e) If the door or cover on the housing can be opened without the use of a key or tool,
a barrier of insulating material shall be provided, which not only provides
protection against unintentional contact with the accessible live parts, but also
prevents access to the exposed conductive parts only after the cover is opened; in
any case, this barrier shall not be removed without the use of tools.
6.5.1.4 Limitation of steady-state contact current and charge
If the components inside the electrical control assembly may still have steady-state
contact current and charge after the power is cut off (such as capacitors), warning signs
are required.
Small capacitors used for arc extinguishing and relay delay action, etc. shall not be
6.6 Selection and installation of components
6.6.1 Selection of components
The components installed in the electrical control assembly shall meet the requirements
of relevant product standards.
Components shall be suitable for the specific purpose of the design of the electrical
control assembly; they shall be suitable for their rated voltage, rated current, rated
frequency, service life, short-circuit withstand strength, etc.
6.6.2 Installation of components
The installation and wiring of components in electrical control assembly shall be based
on the instructions provided by their manufacturers, so that their functions will not be
damaged due to interactions during normal operation. For electronic equipment, it may
be necessary to isolate or shield the electronic signal processing circuit.
If fuses are installed, the original manufacturer shall specify the type and rating of the
fuse used.
6.6.3 Operating mechanism
The equipment shall have a normal operating mechanism. If necessary, the equipment
shall be equipped with an "emergency stop" switch or button. The switch or button shall
be located in a position that is easy for the operator to find and operate. The operating
handle or button of the switch shall be "red" and the button shall be emergency type.
The movement direction of the operating mechanism in the electrical control assembly
shall comply with the provisions of GB/T 4205.
6.6.4 Indicator lights and buttons
The colors of the indicator lights and buttons used in the electrical control assembly
shall comply with the provisions of GB/T 4025.
6.6.5 Printed boards
The printed boards used in electrical control assembly shall comply with the provisions
of GB/T 4588.1 and GB/T 4588.2.
6.6.6 Control units
The control units used in electrical control assembly shall be able to withstand rapid
changes in air temperature during storage, transportation, use; they shall be verified in
accordance with the tests of 7.18.1, 7.18.2, 7.18.5. For control units used in various
types of electrical control assembly, corresponding provisions shall be made in the
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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