Switching power supply safety standards
Safety standards
Safety standards are standard that defines equipment and devices so that they can be used safely without fire or electric shock.
Below are the safety standards of major countries.
USA UL standard
UL60950-1 (information processing equipment) corresponds to the switching power supply.
We investigate, research, and test whether materials, equipment, and system products on the market are safe, create safety standards, and open them to the public.
UL was founded in 1984 and originally started as a non-profit organization. At that time, fire accidents occurred frequently when electric appliances such as light bulbs invented by Edison began to be used. That is why insurance companies have been established to confirm the safety of electrical products.
Canada CSA standard
C22.2 NO60950-1 (information processing equipment) is applicable as the switching power supply. CSA standard is a safety standard established by the Canadian Standards Association, a non-profit organization established in 1919.
Canadian law requires electrical products, medical devices, and equipment connected to the power grid to comply with the CSA standard for fire and electric shock safety.
European EN standard CE marking
EN standard
EN60950-1 (information processing equipment) corresponds to the switching power supply.
The EN standard is also called the CEN standard (CEN / CENELEC standard) or the European standard. European member countries are obliged to adopt the EN standard as their national standard
CE marking
It is a safety mark required when exporting equipment to Europe. The “CE mark” is a safety mark that is required to be affixed to designated products sold in the EU (European Union region) under the system started in 1993. It refers to the standard conformity mark attached to the product that meets all the standards for selling in EU member states, and displaying it is read as CE marking. It was created with the aim of unifying the safety standards of each EU country, ensuring a certain level of safety for products, and allowing products to be freely distributed within the EU.
In order to bear the CE mark, it is necessary to comply with the “EC Directive”.
There are three commands related to power supply.
・EMC Directive
・Machinery Directive
The Low Voltage Directive is a technical requirement for electrical products operating at AC50-1000V and DC75-1500V.
The EMC Directive is that it does not emit strong electromagnetic waves and is not affected by electromagnetic waves from others.
Machinery Directives are about the basic safety that industrial machines such as machine tools and robots should have.
Immunity (EMS)
Immunity is the ability of an electrical product to operate normally when it receives static electricity, lightning surges, electromagnetic waves, momentary power outages, etc. from the outside. Also known as Electromagnetic Susceptibility (EMS).
The immunity test simulates typical electromagnetic noise. In the actual test, the permissible malfunction is determined by the type of electromagnetic noise. This test is specified in the IEC standard as the IEC61000-4 series.
It’s complicated, but there are EMS and EMI separately.
Immunity is not affected by noise, and emissions are not making noise from yourself.
This is the end of the article.
Thank you for reading.