CAT II и CAT III tech.

[Cherepakha]

Пожалуйста, помогите перевести такое предложение:
To avoid fire or electrical shock if a test tool input is connected to more 42V peak (30Vrms) or on circuits of more than 4800VA:
- Do not apply voltages that differ more than 400 V from earth ground to any input when measuring in a CAT Ⅲ environment.
- Do not apply voltages that differ more than 400 V from earth ground to any input when measuring in a CAT Ⅱ environment.
Не понимаю, что такое CAT Ⅲ и CAT Ⅱ environment. Заранее спасибо.

[10-4]

категория

[wander_]

Measurement Category I: This category is for measurements of voltages from specially protected secondary circuits. Such voltage measurements include signal levels, special equipment, limited-energy parts of equipment, circuits powered by regulated low-voltage sources, and electronics.

Measurement Category II: This category refers to local-level electrical distribution, such as that provided by a standard wall outlet (for example, 115 AC voltage for U.S. or 130 AC voltage for Europe). Examples of Measurement Category II are measurements performed on household appliances, portable tools, and similar modules.

Measurement Category III: This category refers to measurements on hard-wired equipment in fixed installations, distribution boards, and circuit breakers. Other examples are wiring, including cables, bus bars, junction boxes, switches, socket outlets in the fixed installation, and stationary motors with permanent connections to fixed installations.

Measurement Category IV: This category refers to measurements on primary over-current protection devices and on ripple control units.

Measurement Categories are used to rate test instruments on their ability to resist a voltage spike, which is applied through a specific resistance.

[Cherepakha]

Спасибо