NEMA, UL and CSA standards, in North America, and the use of U.S. standards of national and regional implementation. The IEC, EN standards are mostly covered by the countries in Europe and the implementation of metrics, EN Zeyi the main European Union countries. This is a larger difference between the two, NEMA, CSA standard chassis used mainly for a more detailed description of some of the environment. The IEC, EN standards are mostly made to the protection target specific provisions.
Type level and IP level in the following three points are common:
1. Protection of people from touching the chassis of internal parts.
2. Protective equipment chassis from external intrusion of solid substances, including dust.
3. Protective equipment from the chassis intrusion of water. Protection class
NEMA250 and UL50 increased the definition of the following requirements must be met: l mechanical impact on the chassis wall waterproof l Article l aging and anti-corrosion oil l door and locking lid and metallic instruments require the structural requirements for l (only UL50)
