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As of my last knowledge update in October 2023, the permissible noise exposure limit for the construction industry is typically set by regulatory agencies such as the Occupational Safety and Health Administration (OSHA) in the United States. OSHA generally establishes an 8-hour time-weighted average (TWA) noise exposure limit of 90 decibels (dB). For shorter durations, higher levels may be permitted, but employers must implement hearing conservation programs when noise exposure exceeds certain thresholds. Always check current regulations, as they may change or vary by location.

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What is the permissible neutral current?

I think you mean "what is the permissible imbalance between live and neutral current" All current supplied by the live wire should exit via the neutral. Any imbalance leaving via Earth is detected by an earth leakage circuit breaker . They trip at about 30 mA.


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As of my last update, the national average Total Recordable Incident Rate (TRIR) in the construction industry typically ranges from 3.0 to 4.0 incidents per 100 full-time workers. This figure can vary based on factors such as the specific type of construction work and regional safety practices. It's important to consult recent data from the Occupational Safety and Health Administration (OSHA) or industry reports for the most current statistics.


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Thet resistor opposes the flow of current through it becoz of its internal construction. Its material has opposing property.


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The CL of a current transformer signifies the accuracy class of the transformer. It indicates the maximum permissible error in percentage for a given range of primary current. The lower the CL value, the higher the accuracy of the current transformer. It is important to select a current transformer with an appropriate CL value to ensure accurate measurement and protection in electrical systems.


Why 4-20 mA why not 3-19 mA for current output?

Because 4-20ma is an industry standard.

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I think you mean "what is the permissible imbalance between live and neutral current" All current supplied by the live wire should exit via the neutral. Any imbalance leaving via Earth is detected by an earth leakage circuit breaker . They trip at about 30 mA.


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