Standard No.:	GBZ/T 229.4-2012
English Name:	Classification of occupational hazards at workplaces--Part 4:Occupational exposure to noise
Chinese Name:	工作场所职业病危害作业分级 第4部分：噪声
Chinese Classification:	C52    Labor sanitation
Professional Classification:	GB    National Standard
Issued by:	MOH
Issued on:	2012-6-5
Implemented on:	2012-12-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	6000 words
Price(USD):	140.0
Delivery:	via email in 1 business day

Classification of occupational hazards at workplaces - Part 4: Occupational exposure to noise 1 Scope This part of GBZ/T 229 specifies the classification principles and methods of work(job) exposed to industrial noise at workplaces. This part is applicable to the classification management of work(job) exposed to industrial noise. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies. For undated references, the latest edition (including any amendments) applies. GBZ 2.2-2007 Occupational exposure limits for hazardous agents in the workplace - Part 2: Physical agents GBZ/T 189.8-2007 Measurement of physical agents in workplace - Part 8: Noise 3 Terms and definitions For the purpose of this document, the following terms and definitions apply. 3.1 industrial noise noise generated during production 3.2 steady noise noise with A-weighted sound pressure level fluctuation < 3 dB 3.3 non-steady noise noise with A-weighted sound pressure level fluctuation ≥ 3 dB   3.4 impulsive noise noise with duration ≤ 0.5 s, interval > 1 s, and sound pressure RMS change of A-weighted sound pressure level ≥ 40 dB 3.5 work(job) exposed to noise work(job) with sound that is harmful to hearing and health or may cause other hazards, and the equivalent continuous A-weighted sound pressure level of 8 h/d or 40 h/week noise exposure ≥ 80 dB 3.6 A-weighted sound pressure level LpA, LA sound pressure level measured with A-weighted network 3.7 equivalent continuous A-weighted sound pressure level LAeq,T, LAeq within the stipulated time limit, if A-weighted sound pressure of a certain continuous steady noise has the same mean square A-weighted sound pressure with time-varying noise, then the sound pressure level of the continuous steady noise is the equivalent sound pressure level of the time-varying noise, in decibel (dB)

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Classification 5 Principle of classification management Annex A (Normative) Instructions for correct usage Annex B (Informative) Classification example