EN 62368-1 applies to information technology devices powered by batteries or mains, including commercial electrical devices and devices connected to them, with a DECLARED VOLTAGE not exceeding 600 V.
EN 62368-1, also;
- Designed for use as a TELECOMMUNICATION infrastructure device and telecommunication terminal device, regardless of the power source,
- Intended and designed to be connected directly to a CABLE DISTRIBUTION SYSTEM, regardless of the power source, or to be used as an infrastructure device,
- Designed to use an AC MAINS as a communications communication medium
(See Note 4 to Clause 6 and Note 4 to Clause 7.1) also applies to information technology devices.
EN 62368-1 can also be applied to components and subsystems intended for use with information technology devices. Provided that the entire information technology device used with the component and subsystem complies with EN 62368-1, components and subsystems are not expected to comply with all EN 62368-1 rules.
NOTE 1: Examples of issues that components and subsystems do not have to comply with include marking of power ratings and access to hazardous areas.
Note 2 - Even if a device has systems that are not fully covered by EN 62368-1, such as large-scale ventilation systems, fire detection and extinguishing systems, EN 62368-1 can be applied to all electronic parts of the device. Different rules may be required for some applications.
EN 62368-1 contains safety rules to reduce the risks of burns, electric shock and injury for OPERATORS, ordinary people who may come into contact with the device and, where specifically stated, for SERVICE PERSONNEL.
EN 62368-1 aims to reduce certain risks for a device with a system of interconnecting units or individual units involved in the installation, operation and maintenance of the device as described by the manufacturer.
Examples of devices covered by EN 62368-1
Banking device Money counting/payment machines such as automatic teller machines (ATM)
Data and text processing machines and auxiliary equipment Data preparation device, data processing device, data storage device, personal computers, graph plotters, printers, scanners, text processing devices, visual display units
Data network device Bridges, data circuit termination device, data end device, router
Electrical and electronic vending equipment Point of sale terminals (POS) including cash register machines, electronic scales
Electrical and electronic office machines Calculators, copy machines, dictation devices, document trimming machines, duplicators, erasers, micrographic office equipment, motor-driven files and paper cutters (punchers, cutting machines, sorters), paper feed machines, pencil sharpeners, staplers and typewriters.
Other Information Technology device Photo printing device, public information terminals, multimedia devices
Postal device Letter processing machines, postal machines
Telecommunication network infrastructure device Billing device, multiplexers, network feeding device, network termination device, radio base stations, repeaters, transmission device, telecommunication switching device
Telecommunications terminal equipment Fax machines, switched telephone systems, modems, PABXs, pagers, telephone answering machines, telephone sets (wired and cordless)
General rules
1.3.1 Application of the rules
The detailed rules in EN 62368-1 should only be applied where safety is a concern.
To determine whether a safety concern exists, circuits and structure must be carefully examined to take into account possible failure consequences.
1.3.2 Device design and construction
The device must be designed and constructed to provide protection against the spread of fire arising from the device, under all conditions of normal use and possible abnormal use or single fault, to reduce the risk of human injury from electric shock and other hazards.
The suitability of the device is checked by inspection or relevant tests.
1.3.3 Supply voltage
The device must be designed to be safe at any supply voltage to which it is intended to be connected.
The conformity of the device is checked by inspection or by the relevant tests of the standard, using a supply voltage as specified in the relevant article of EN 62368-1. If this clause does not provide the supply voltage (by Clause 1.4.5 or expressly), the DECLARED VOLTAGE value or any value within the DECLARED VOLTAGE RANGE should be used.
1.3.4 Structures outside the scope of EN 62368-1
Devices incorporating construction methods, materials or technologies not covered by EN 62368-1 must ensure a level of safety not less than that set out in this standard and the safety principles contained therein.
Note - The standard preparation committee should be appropriately warned to ensure adaptation to the new situation with additional detailed rules.
1.3.5 Equivalent materials
Where EN 62368-1 specifies a specific insulation class, the use of a higher class of insulation is permitted.
Similarly, where EN 62368-1 specifies a specific FLAMMABILITY CLASS, the use of the higher class is permitted.
1.3.6 Transport and orientation during use
If the device during use clearly affects the orientation rules or test results, all permissible guidance must be followed or the manufacturer's instructions must be followed. All transport and usage instructions for PORTABLE DEVICES must be observed.
Note - The above applies to Clauses 4.1, 4.2, 4.3.8, 4.5, 4.6 and 5.3 of this standard.
1.3.7 Selection criteria
Where EN 62368-1 allows different criteria for conformity, a choice between different test methods or conditions, the selection criterion is specified by the manufacturer.
1.3.8 Examples mentioned in EN 62368-1
Where device examples, parts, construction methods, design techniques and errors are given in EN 62368-1, they are indicated with a prefix “for example” or “like”, other examples, situations and solutions are not excluded.
1.3.9 Conductive liquids
For the electrical rules of EN 62368-1, conductive liquids must be considered as conductive parts.
1.3.Z1 Exposure to excessive sound pressure
The device must be configured and designed to be non-hazardous when used as intended under fault conditions or normal operating conditions, providing particular protection against exposure to excessive sound pressure at the headphone or loudspeaker output.
Note Z1- New measurement methods for sound system equipment are given in EN 50322-1 and EN 50322-2:
EN 50322-1: Audio system equipment: Portable audio systems and associated headphones and speakers -
Methodology and limit values for measuring the maximum sound pressure level - Part 1 - General method for “a package of devices”,
EN 50322-2: Audio system equipment: Portable audio systems and associated headphones and speakers -
Methodology and limit values for measuring the maximum sound pressure level - Part 2 - Guide for combination sets with loudspeakers from different manufacturers.
1.4 General rules for experiments
1.4.1 Application of tests
The tests specified in EN 62368-1 should only be carried out when safety is a concern.
If it is obvious that a specific test is not practicable in terms of the design and construction of the device, the test shall not be performed.
Unless otherwise stated, the test does not require the device to be functional.
1.4.2 Type tests
Unless otherwise specified, the tests specified in this standard are TYPE TESTS.
1.4.3 Test samples
Unless otherwise specified, the sample or samples tested must represent the device that the USER will receive or be the device itself that will be sent to the USER.
As an alternative to tests on the entire device, tests can be carried out separately on circuits, components or subassemblies outside the device. However, such inspection of the device and circuit arrangements must ensure that the device installed with this type of testing method complies with the rules specified in this standard.
If a test given in this standard is destructive, it is permitted to use a model that represents the situation to be evaluated.
NOTE 1 - Tests must be carried out in the following order:
- Component or material pre-selection,
- Component or part bench tests,
- Device tests without energization,
- Experiments performed while the device is running:
- Under normal operating conditions,
- Under abnormal operating conditions,
- In situations that are likely to be destroyed.
Note 2 - In order to reduce materials and waste used in tests, all interconnected sections should be tested at the same time.
1.4.4 Operating parameters for experiments
Except where special test conditions are specified in this standard and where a significant influence on the test results is evident, the tests shall be carried out with the device operating in the most undesirable combination of the following variables specified in the manufacturer's operating instructions:
- Supply voltage (Article 1.4.5),
- Supply frequency (Article 1.4.6),
- Operating temperature (Article 1.4.12),
- Physical layout of the device and locations of moving parts,
- Operating mode,
- Adjustment of THERMOSTAT, regulating device or similar controls in OPERATOR ACCESS AREAS. These settings are made in two ways:
- Adjustment made without using a TOOL,
- Adjustment using a wrench or a TOOL specifically provided to the OPERATOR.
1.4.5 Supply voltage for experiments
In determining the most undesirable voltage to energize the device under test (DGC), the following should be taken into account:
- DECLARED VOLTAGES,
- DECLARED VOLTAGE tolerances as stated below,
- RATED VOLTAGE RANGE limits.
If the device is intended to be directly connected to the mains or equivalent, tolerances to the DECLARED VOLTAGE should be taken as +6% and -10% except in the following cases:
- If the DECLARED VOLTAGE is 230 V in single phase or 400 V in three phases, the tolerance should be taken as +10% and -10%,
- If a larger tolerance is specified by the manufacturer, this value should be used.
AC MAINS SUPPLY or a.c. generator driven by an engine other than AC MAINS SUPPLY or uninterruptible power supply (Article 1.2.8.1). If the device is intended to be connected to a source equivalent to the mains source, the DECLARED VOLTAGE tolerance must be specified by the manufacturer.
If the device is intended to be connected to the MAINS SUPPLY, the tolerance should be taken as +20% and -15% unless otherwise specified by the manufacturer.
The device is only d.c. If it is designed for , the possible effects of incorrect connection should be taken into account.
1.4.6 Supply frequency for experiments
In determining the most undesirable frequency of power energizing the DGC, the different RECEIVED FREQUENCIES within the DECLARED FREQUENCY RANGE must be taken into account (e.g. 50 Hz and 60 Hz). However, tolerance on the DECLARED FREQUENCY (e.g. 50 Hz ± 0.5 Hz) is not normally required.
1.4.7 Electrical measuring instruments
Electrical measuring instruments must have sufficient bandwidth to make accurate measurements, taking into account all components of the measured parameter (DC, AC MAINS SUPPLY supply frequency, high frequency and harmonic component). Coke. If the value is being measured, the measuring device must be used for non-sinusoidal waves, as for sinusoidal waves. Make sure it gives the value.
1.4.8 Normal operating voltages
- In determining WORKING VOLTAGES (Article 1.2.9.6) and
- The circuits in the device are ELV CIRCUITS, SELV CIRCUITS, TNV-1 CIRCUITS, TNV-2
CIRCUITS, TNV-3 CIRCUIT, or DANGEROUS VOLTAGE circuits, the following voltages should be considered:
- normal operating voltages generated at the device, including repetitive peak voltages similar to those in switch-mode power supplies,
- Normal operating voltages generated outside the device, including telephone signals received from TELECOMMUNICATIONS NETWORKS,
For these purposes, undesirable, externally generated transient voltages that are not reproduced by the switching and radiation of the power distribution system (e.g., NETWORK TRANSIENT VOLTAGES and TELECOMMUNICATIONS NETWORK TRANSIENT VOLTAGES) should not be taken into account.
- When determining the operating voltages, such transient situations are taken into account in determining the minimum INSULATION INTERVALS; for this, see Article 2.10.3 and Annex G.
- Except for a classification between SELV CIRCUITS and TNV-1 CIRCUITS and TNV-2 AND TNV-3 CIRCUITS, Article 1.2.8.11 and Table 1A should be consulted when classifying the circuits in the device.
NOTE The effect of undesirable steady-state voltages generated outside the device (for example, ground potential differences and voltages induced on the TELECOMMUNICATIONS NETWORK by electric train systems) is controlled by installation practice or by suitable insulation in the device. These measures are application dependent and are not examined in this standard.
1.4.9 Measuring earth voltage
Where this standard specifies a voltage between a conductive part and earth, all of the following earthed parts are taken into account:
- Protective earth terminal (if available) and,
- another conductive part that must be connected to protective earth (for example, Clause 2.6.1), and,
- Any conductive part of the device that is grounded for functional reasons.
Parts that will be grounded through connection to another device but are not grounded in the device under test must be connected to ground at the point where the highest voltage is obtained. In an intended application of the device, when measuring a voltage between a conductor that will not be grounded in the circuit and the ground, a non-inductive 5000 ? is applied between the ends of the voltage measuring device. A resistance of ± 10% must be connected.
The voltage drop in the PROTECTIVE EARTH CONDUCTOR of the power cable or the ground conductor of other external cables is not taken into account in the measurements.
1.4.10 Loading configuration of DGC
In determining the input current (see 1.6.2), where other test results may be affected, the following variables should be taken into account and adjusted to give the most undesirable values:
- loads arising from optional conditions provided or recommended by the manufacturer within or in conjunction with the DGC,
- Loads arising from other units of the device intended by the manufacturer to draw power from the DGC,
- Loads that can be connected to any standard supply outputs in the OPERATOR ACCESS AREAS on the device. These loads can be up to the signal value specified in Article 1.7.5.
It is allowed to use artificial loads to simulate these loads during the test.
1.4.11 Power drawn from the telecommunication network
For the purposes of this standard, the power that can be drawn from a telecommunications network is considered to be limited to 15 VA.
1.4.12 Temperature measurement conditions
1.4.12.1 General
Temperatures measured on the DGC shall comply with Clause 1.4.12.2 or Clause 1.4.12.3 (as applicable). All temperatures are in Celsius (ºC).
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