IEC 60950-22: 2016户外安装信息技术设备安全标准概述

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IEC 60950-22:2016 是国际电工委员会（IEC）发布的一项关于信息技术设备安全标准，特别关注于户外安装设备（Equipment to be installed outdoors）。该标准适用于所有设计用于户外环境的信息技术设备，包括但不限于现场直装的户外外壳，这些外壳旨在保护安装在户外地点的设备。标准的1.1节明确了适用范围，规定IEC 60950-22适用于安装在户外的设备，其安全性要求不仅针对设备本身，也适用于用作户外设施的外壳。这意味着制造商在设计这类产品时，必须满足标准中关于耐候性、防潮、防尘、耐高温和低温等多方面的户外环境适应性要求。 1.2节强调了额外的要求，即除了基本的安全考量外，还可能需要考虑特定的环境条件因素，如设备的机械强度、抗腐蚀性、防雷击保护、电源连接的安全性以及在极端气候下的性能稳定性。这些额外要求旨在确保户外设备能够在各种自然条件下正常运行，同时保证用户的人身和设备安全。版权信息部分强调了出版物的知识产权保护，未经IEC或相关国家委员会的书面许可，任何形式的复制或利用都受到限制。对于版权问题或获取更多使用权利的查询，用户应联系指定地址或当地的IEC成员国家委员会获取详细信息。 IEC 60950-22:2016是确保户外信息技术设备安全的重要规范，它为制造商、安装人员和用户提供了一套全面的指导，涵盖了设备设计、选材、制造、安装及维护的全过程，以应对户外环境中的挑战。遵循此标准，可以有效防止因恶劣天气、环境因素导致的设备故障和潜在危险，提升户外设备的整体可靠性与使用寿命。

IEC 60950-22:2016 © IEC 2016 – 9 –

NOTE 1 The temperature values are based on IEC 60721-3-4 class 4K2. These temperatures do not take into

account severe environments (for example, extremely cold or extremely warm), nor do they include provision for

heating by radiation from the sun (solar loading).

NOTE 2 Attention is drawn to IEC 61587-1 for additional information on performance levels C1, C2 and C3

NOTE 3 In Finland, Norway and Sweden, the temperature in winter can be extremely low. For OUTDOOR

EQUIPMENT

this will demand special design so that the equipment can stand transport, erection and

operation/service at temperatures down to –50 °C.

4.2 Mains supply

4.2.1 General

Mains-operated

OUTDOOR EQUIPMENT shall be suitable for the highest MAINS TRANSIENT

VOLTAGE

expected in the installation location.

Consideration shall be given to the following:

– the prospective fault current of the supply to

OUTDOOR EQUIPMENT can be higher than for

indoor equipment, see IEC 60364-4-43; and

– the

MAINS TRANSIENT VOLTAGE for OUTDOOR EQUIPMENT can be higher than for indoor

equipment.

Within a certain overvoltage category, components within

OUTDOOR EQUIPMENT that reduce the

MAINS TRANSIENT VOLTAGE or the prospective fault current shall comply with the requirements

of the IEC 61643-series.

NOTE 1 The overvoltage category of OUTDOOR EQUIPMENT is normally considered to be one of the following:

– if powered via the normal building installation wiring, overvoltage category II;

– if powered directly from the mains distribution system, overvoltage category III;

– if at, or in the proximity of, the origin of the electrical installation, overvoltage category IV.

NOTE 2 For further information regarding protection from overvoltages, see IEC 60364-5-53.

Compliance is checked by inspection of the equipment and the installation instructions.

4.2.2 Mains transient voltage on AC mains supply

Equipment that is part of the building installation, or that may be subject to transient

overvoltages exceeding those for overvoltage category II, shall be designed for overvoltage

category III or IV, unless additional protection is to be provided internally or externally to the

equipment. In this case, the installation instructions shall state the need for such additional

protection. Clearances in equipment designed for overvoltage category III or IV shall comply

with Annex G of IEC 60950-1:2005. The insulation system used in such equipment shall be

capable of withstanding the test voltage given in Table 5C of IEC 60950-1:2005/AMD2:2013.

4.2.3 Mains transient voltage on DC mains supply

The transient on a

D.C. MAINS SUPPLY depends on the source and the installation of the D.C.

MAINS SUPPLY

. When determining the D.C. MAINS TRANSIENT VOLTAGE, the installation and the

source of the

D.C. MAINS shall be taken into account. If these are not known, the MAINS

TRANSIENT VOLTAGE

on the D.C. MAINS SUPPLY shall be assumed to be 1,5 kV.

The manufacturer shall declare the

MAINS TRANSIENT VOLTAGE on the D.C. MAINS SUPPLY in the

installation instructions.

– 10 – IEC 60950-22:2016 © IEC 2016

4.3 Rise of earth potential

Attention is drawn to the fact that during fault clearing conditions, HAZARDOUS VOLTAGES may

exist and be accessible for longer periods than for indoor equipment and special earthing

conditions may be necessary. These are typically specified in local installation codes.

NOTE In the USA, these requirements are contained in the National Electrical Code. In Canada, they are

contained in the Canadian Electrical Code.

Compliance is checked by evaluation of the installation instructions.

5 Marking and instructions

The installation instructions for OUTDOOR EQUIPMENT shall include details of any special

features needed for protection from conditions in the

OUTDOOR LOCATION (see 1.7.2 of

IEC 60950-1:2005).

If a manufacturer of an

OUTDOOR ENCLOSURE classifies a product in accordance with

IEC 60529, the IP code shall be declared, however it is not required to mark the IP code on

the

OUTDOOR ENCLOSURE. It is not required to make such a declaration for OUTDOOR EQUIPMENT.

Compliance is checked by inspection.

6 Protection from electrical shock in an outdoor location

6.1 Voltage limits of user-accessible parts in outdoor locations

USER-accessible conductive parts in an OUTDOOR LOCATION shall meet the requirements for an

SELV CIRCUIT in 2.2.2 and 2.2.3 of IEC 60950-1:2005/AMD2:2013, except that the voltage

limits shall not exceed:

– 15 V a.c., 21,2 V peak, or 30 V d.c. under normal operating conditions (see 2.2.2),

– 15 V a.c., 21,2 V peak, or 30 V d.c. for longer than 0,2 s under single fault conditions (see

2.2.3). Moreover, the voltage shall not exceed 30 V a.c., 42,4 V peak or 60 V d.c.

The exception in 2.2.3 of IEC 60950-1:2005/AMD2:2013 relating to 2.3.2.1 b) of the same

publication, does not apply to

USER-accessible conductive parts.

NOTE 1 Lower voltage limits apply because the contact resistance of the body is reduced when subjected to wet

conditions.

NOTE 2 In Denmark, the installation rules require the maximum safe to touch nominal voltage to be 6 V a.c. r.m.s.

or 15 V ripple-free d.c. for outside environment, where the installation normally can be humid or wet due to the

weather condition including area with shelters, but not in protected walls e.g. carports.

Compliance is checked by measurement.

6.2 Limited current circuits in outdoor locations

The requirements of 2.4 of IEC 60950–1:2005/AMD1:2009/AMD2:2013, apply without change.

6.3 Protection for socket-outlet in outdoor locations

A residual current protective device (RCD) with rated residual operating current not exceeding

30 mA shall be used in the

MAINS SUPPLY to socket-outlets intended for general use and with a

rated current not exceeding 20 A.

IEC 60950-22:2016 © IEC 2016 – 11 –

The RCD shall be an integral part of the equipment or of the building installation. If the RCD is

part of the building installation, instructions for installations of the RCD shall be provided with

the equipment.

7 Wiring terminals for connection of external conductors

The mains supply terminations for OUTDOOR EQUIPMENT that is intended to be powered:

– via the normal building installation wiring, shall be as specified in 3.3 of

IEC 60950-1:2005/AMD2:2013;

– directly from the mains distribution system, shall be as specified in the IEC 60364 parts.

NOTE For other terminals, IEC 60950-1 applies.

Compliance is checked by inspection.

8 Construction requirements for outdoor enclosures

8.1 General

Protection against corrosion shall be provided by the use of suitable materials or by the

application of a protective coating applied to the exposed surface, taking into account the

intended conditions of use.

Parts, such as dials or connectors, that serve as a functional part of an

OUTDOOR ENCLOSURE

shall comply with the same environmental protection requirements as for the

OUTDOOR

ENCLOSURE

NOTE 1 Aspects affecting safety which require the integrity of the OUTDOOR ENCLOSURE through the life of the

product include:

– continued protection against access to hazardous parts, including after mechanical strength tests;

– continued protection against ingress of dust and water;

– continued provision of earth continuity.

An OUTDOOR ENCLOSURE shall not be used to carry current during normal operation if this

could cause corrosion that would impair safety. This does not preclude connection of a

conductive part of an

OUTDOOR ENCLOSURE to protective earth for the purpose of carrying fault

currents.

NOTE 2 The action of a current flowing through a joint can increase corrosion under wet conditions.

Where a conductive part of an OUTDOOR ENCLOSURE is connected to protective earth for the

purpose of carrying fault currents, the resulting connection shall meet the requirements of 2.6

of IEC 60950-1:2005/AMD1:2009/AMD2:2013, after the appropriate weather conditioning tests,

see 8.3.

Compliance is checked by inspection and, if necessary, by the tests of 2.6 of

IEC 60950-1:2005/AMD1:2009/AMD2:2013 and 8.3 of this standard.

8.2 Resistance to ultra-violet radiation

Non-metallic parts of an

OUTDOOR ENCLOSURE required for compliance with this standard shall

be sufficiently resistant to degradation by ultra-violet (UV) radiation.

Table 1 – Minimum property retention limits after UV exposure

Parts to be tested Property

Standard for the

test method

Minimum retention

after test

Parts providing mechanical support

Tensile strength

IS0 527 70 %

Flexural strength

a, b

ISO 178 70 %

Parts providing impact resistance

Charpy impact

ISO 179 70 %

Izod impact

ISO 180 70 %

Tensile impact

ISO 8256 70 %

All parts Flammability

classification

1.2.12 and Annex A of

IEC 60950-1:2005

see

Tensile strength and flexural strength tests are to be conducted on specimens no thicker than the actual

thicknesses.

The side of the sample exposed to UV radiation is to be in contact with the two loading points when using the

three-point loading method.

Tests conducted on 3,0 mm thick specimens for Izod impact and tensile impact tests and 4,0 mm thick

specimens for Charpy impact tests are considered representative of other thicknesses, down to 0,8 mm.

The flammability classification may change as long as it does not fall below that specified in Clause 4 of

IEC 60950-1:2005/AMD1:2009/AMD2:2013.

Compliance is checked by examination of the construction and of available data regarding the

UV resistance characteristics of the

ENCLOSURE material and any associated protective

coating. If such data is not available, the tests in Table 1 are carried out on the parts.

Samples taken from the parts, or consisting of identical material, are prepared according to

the standard for the test to be carried out. They are then conditioned according to Annex C.

After conditioning, the samples shall show no signs of significant deterioration, such as

crazing or cracking. They are then kept at room ambient conditions for not less than 16 h and

not more than 96 h, after which they are tested according to the standard for the relevant test.

In order to evaluate the percent retention of properties after test, samples that have not been

conditioned according to Annex C are tested at the same time as the conditioned samples.

The retention shall be as specified in Table 1.

8.3 Resistance to corrosion

8.3.1 General

Metallic parts of

OUTDOOR ENCLOSURES, with or without protective coatings, shall be resistant

to the effects of water-borne contaminants.

Compliance is checked by either:

− inspection and by evaluation of data provided by the manufacturer; or

− the tests and criteria as specified in 8.3.2 through 8.3.4; or

− the applicable performance level (A1, A2 or A3) of IEC 61587-1.

8.3.2 Test apparatus

The apparatus for the salt spray test shall consist of a test chamber and spraying devices as

described in IEC 60068-2-11.

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IEC 60950-22: 2016户外安装信息技术设备安全标准概述

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