Domestic And International Standards For Low-voltage Switchgear

Domestic and international standards for low-voltage switchgear

ANSI is used to refer to North American standards in general, while IEC is used for international standards in regions other than North America, unless specific standards are referenced. UL, NEMA, and ANSI standards clearly distinguish between different types of low-voltage distribution and control equipment designed for different market needs. Metal enclosed switchgear, low-voltage cabinet, distribution cabinet, Bus duct and motor control cabinet adopt different standards. These are independently created by different standards bodies. Some products have multiple standards, each created by a different body, covering different aspects of design and application, and sometimes have different rules for the same characteristics. The IEC standard only covers all these low-voltage products in one standard and consolidates them all into one component.

The most obvious difference between ANSI and IEC standards is that the ANSI standard is created for a single, specialized electrical system, with a universal distribution and grounding (grounding) architecture. They are also designed for general electrical codes. On the other hand, IEC standards must cover a range of electrical systems and must be applicable to several different electrical specifications.

The ANSI standard provides more detailed structural requirements than IEC, thus allowing for a narrower range of alternative solutions. The ANSI standard also provides information on devices used with components, with IEC covering such devices in a separate and independent standard.

UL (Underwriters Laboratories) and CSA (CSA Group) monitor compliance with ANSI standards. In most cases, they use the following low-voltage standards and add some requirements:

ANSI/IEEEEC37.20.1, UL1558 and ANSI C37.51 are used for metal enclosed low-voltage power circuit breaker switchgear;

ANSI/UL845 and NEMA ICS1 and ICS3 are suitable for low-voltage motor control cabinets;

ANSI/IEEEEC37.21 is used for controlling distribution boards;

ANSI/UL891 and NEMAPB2 and PB2.1 are used for distribution boxes;

ANSI/UL67 and ANSI/NEMA PB1 are used as safety standards for switchboards.

UL857 and NEMA BU1 are used for Bus duct.

Usually, compliance with IEC standards is not monitored. Manufacturers and customers are responsible for ensuring compliance with standards applicable to local conditions. It is normal for the testing station to conduct short-circuit and arc suppression tests, as if any other tests fail, these tests will prove the last line of defense. The IEC standard only has one IEC60439-1, but it has multiple derivative standards.

To legally sell low-voltage products in the European Union (EU), it must comply with the requirements of European standard EN60439-1 and bear the CE mark. This is IEC, and in order for the equipment to be used safely in the EU, there needs to be a deviation. At present, these two standards are actually the same, but there is no legal requirement to do so. EU countries usually have national equivalent standards for EN, such as BSEN60439-1 (UK) or CEI17-13/1 (Italy), which are EN standards with national attachments. These additional clauses enable EN equipment to be safely used in these countries/regions. EU legislation prohibits its use as a trade restriction, so these deviations should be minimized as much as possible. The manufacturer must demonstrate compliance with the standards. There are strict definitions and limited ways to challenge such authentication.

To legally sell low-voltage products in China, they must comply with the requirements of our national standard GB/T7251-1 and bear the mandatory certification CCC mark. This is for the safety requirements of equipment that differ from IEC standards.

Other countries, such as Australia and Brazil, also have their own IEC standard derivatives (AS 3439 and NBR 6808), but compliance with these standards is usually a contractual requirement rather than a legal requirement, and like EN standards, changes are usually minimal

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