(Cap 400 section 27) [The regulations apart from regulations 3, 4, 5, 6(2) and 7 Regulations 3, 5 and 7 Regulations 4 and 6(2)］ 1 March 1992 1 June 1992 1 September 1992] (L.N. 426 of 1991) Cap 400D reg 1 Citation (1) These regulations may be cited as the Noise Control (Hand Held Percussive Breakers) Regulations. (2)-(4) (Omitted as spent) (Enacted 1991) Cap 400D reg 2 Interpretation In these regulations, unless the context otherwise requires- "hand held percussive breaker" (手提撞击式破碎机) means any portable breaker or pick that- (a) has a mass above 10 kg; (80 of 1997 s.102) (b) is designed for percussive operation while held by hand without any other form of support; and (c) is driven by electrical, chemical or thermal energy or by energy transmitted by compressed air, steam or hydraulic means;"mass of the breaker" (破碎机机重) means the mass of the hand held percussive breaker when it is fitted for normal use but excluding the supply tube and the chisel; "noise emission label" (噪音标签) means a noise emission label issued by the Authority under regulation 8. (Enacted 1991) Cap 400D reg 3 Prescription Hand held percussive breakers are hereby prescribed for the purposes purposes of Part III of the Ordinance. (Enacted 1991) Cap 400D reg 4 Use of hand held percussive breaker in compliance with noise standards For the purposes of section 17(1) of the Ordinance, all hand held percussive breakers shall comply with the prescribed noise emission standard for hand held percussive breakers. (Enacted 1991) Cap 400D reg 5 Noise emission standard For the purposes of sections 14, 15 and 17 of the Ordinance, the prescribed noise emission standard for hand held percussive breakers is set out in Schedule 1. (Enacted 1991) Cap 400D reg 6 Prescribed noise emission label (1) A noise emission label shall be in the form set out in Schedule 4. (2) For the purpose of section 17(1) of the Ordinance, every hand held percussive breaker shall be fitted with a noise emission label issued in respect of that hand held percussive breaker. (Enacted 1991) Cap 400D reg 7 Noise emission test conditions For the purposes of sections 14, 15, 16 and 17 of the Ordinance, the test conditions for hand held percussive breakers are the conditions set out in Schedule 2. (Enacted 1991) Cap 400D reg 8 Application for the noise emission label (1) An application for a noise emission label shall be made to the Authority in the prescribed form set out in Schedule 3 and shall be accompanied by an application fee of $405 for each noise emission label applied for. (L.N. 262 of 1994; L.N. 498 of 1996; L.N. 583 of 1997; L.N. 309 of 2000) (2) Where the Authority is satisfied on application made to him under subregulation (1) that - (a) a noise testing report certificated by a corporate member of the Institute of Acoustics of the United Kingdom that the hand held percussive breaker in respect of which the application was made complies with the standard set out in Schedule 1 when tested under the conditions set out in Schedule 2, has been issued; or (b) an EEC type-examination certificate has been granted by an approved body appointed by any European Community member state under the European Council Directive 84/537/EEC in respect of the hand held percussive breaker; and (c) an application fee of $405 for each noise emission label applied for has been paid, (L.N. 262 of 1994; L.N. 498 of 1996; L.N. 583 of 1997; L.N. 309 of 2000)the Authority shall issue to the applicant a noise emission label or labels applied for. (3) Not later than 28 days after an application made under subregulation (1) is received by the Authority, the Authority shall issue a noise emission label or labels applied for or serve on the applicant written notice of his refusal to issue the noise emission label or labels, and if at the end of those 28 days he has done neither of those things, a noise emission label or labels shall be deemed to have been issued. (4) No fee paid in respect of an application for a noise emission label shall be liable to be refunded. (Enacted 1991) Cap 400D Sched 1 NOISE EMISSION STANDARD [regulations 5 & 8] Mass of the Breaker Maximum Permissible Sound Power Level in dB(A) Above 10 kg and below 20 kg 108 Equal to or above 20 kg and equal to or below 35 kg 111 Above 35 kg 114 (Enacted 1991) Cap 400D Sched 2 TEST CONDITIONS FOR MEASURING AIRBORNE NOISE EMITTED BY POWERED HAND HELD PERCUSSIVE BREAKERS [regulations 7 & 8] 1. OBJECT 1.1 The purpose of this test is to determine the noise emitted by hand held percussive breakers. 1.2 Both measured and calculated values obtained by this test constitute the basic data for checking that the noise emission of hand held percussive breakers complies with the prescribed standard. 2. SCOPE 2.1 This test is applicable to powered hand held percussive breakers (hereinafter referred to as "appliances"). The test specifies the procedures for use in determining the sound power level of such appliances for the purpose of testing as to conformity under the Noise Control (Hand Held Percussive Breakers) Regulations. 3. DEFINITIONS 3.1 Sound pressure level LpA The sound pressure level LpA is obtained by applying the weighting A to the sound pressure level Lp.The sound pressure level Lp, expressed in dB, of a noise is defined by- Lp=20 log10 P/Po Where- P is the effective sound pressure value measured at a particular point, expressed in Pa; Po is the effective reference sound pressure, equal to 20 x 10-6 Pa. The value LpA of the A-weighted sound pressure level, expressed in dB(A), is obtained by applying the weighting A to the measuring system. 3.2 Measuring surface The measuring surface of area S (see paragraph 8.3) is a hypothetical surface surrounding the sound source and on which the measuring points are arranged (see paragraph 6.4). 3.3 Surface sound pressure level LpAm The surface sound pressure level LpAm is the root mean square of the sound pressures recorded on the measuring surface, calculated in accordance with the method set out in paragraph 8.4. 3.4 Sound power level LWA The sound power level LWA is obtained by applying the weighting A to the sound power level LW. (80 of 1997 s. 102) The sound power level LW, expressed in dB, of a sound source is defined by- LW=10 log10 W/Wo Where- W is the total sound power generated by the sound source, expressed in watts; Wo is the reference sound power, equal to 10-12W. The value LWA of the A-weighted sound power level, expressed in dB, is obtained by applying the weighting A to the measuring system. 3.5 Extraneous noise Extraneous noise means the noise resulting from background noise and parasitic noise. 3.5.1 Background noise Background noise means any noise recorded at the measuring points which is not generated by the appliance. 3.5.2 Parasitic noise Parasitic noise means any noise at the measuring points which is generated by the appliance but not directly radiated by it. 4. CRITERION TO BE USED FOR EXPRESSING RESULTS 4.1 Acoustic criterion for the environment The acoustic criterion for the environment of the appliances is their sound power level. 5. MEASURING INSTRUMENTS 5.1 General The instruments shall be designed to measure the A-weighted level of the root mean square of the sound pressure. The level of the root mean square value in time for a measurement point is obtained either by direct reading of the instrument, or by calculation in accordance with paragraph 11. 5.2 Measuring instruments The following instruments may be used- (a) a sound level meter meeting the requirements of International Electrotechnical Commission (IEC) publication 651:1979 (type 1). The meter shall be set at "slow" response; (b) an integrating sound level meter effecting analog or digital integration of the squared signal over a given time interval meeting the requirements of IEC 804:1985 (type 1). The meter shall be set at "fast" response. 5.3 Microphone with cable Use shall be made of a microphone with cable complying with IEC publication 651:1979, and calibrated for free field measurement. 5.4 Weighting network Use shall be made of an A-weighting network meeting the requirements of IEC publication 651:1979. 5.5 Inspection of the measuring apparatus Before the tests, the acoustic properties of the entire apparatus (measuring instruments including microphone and cable) shall be checked by means of a calibrated sound source with an accuracy of at least 0.5 dB (e.g. a pistonphone); the apparatus shall be checked again immediately after each series of measurements. 6. TEST CONDITIONS 6.1 General 6.1.1 Determining the mass of an appliance When the mass is being determined, the appliance shall be fitted out as for normal use, except for the chisel, the supply tube and, where appropriate, the coupling. 6.1.2 Block characteristics The concrete test block shall be constructed in accordance with Figure 1. 6.2 Operation of the appliance during measurements To ensure that the measurement may be reproduced, all appliances shall be tested in the vertical position. The appliance shall be operated by an operator standing on top of the test block and shall be held firmly down as shown in Figure 2. In the case of pneumatic appliances, the air exhaust axis of the test appliance shall be equidistant from 2 measuring points (air exhausted directly on to a microphone distorts the measurement, which consequently has to be abandoned). The operation of the appliance shall have the same acoustic stability as in normal service and shall satisfy the following requirements- The appliance shall operate at a working pressure of 600 kPa or as specified by the manufacturer. The pressure used shall be indicated in the test report. The appliance shall operate normally; and hindrances to the air exhaust, such as icing up, shall be avoided. In the case of appliances powered other than by compressed air, the operating conditions shall be those corresponding to the maximum speed at which the appliance can operate continuously, according to the manufacturer's statement. 6.3 Measuring site The measuring site must be flat and horizontal. 6.4 Measurement surface, measuring distance, location and number of measuring points 6.4.1 Measuring surface and measuring distance The measuring surface to be used for the test shall be a hemisphere of 4 m radius. 6.4.2 Location and number of measuring points For the measurements there shall be 5 measuring points on a hemisphere of radius r, i.e. points 1, 2, 3, 4 and 5 arranged as illustrated in Figure 3, with variations in the value of z of points as shown in Table 1. The 5 measuring points shall have the following coordinates as measured from the centre on the top face of the concrete block- TABLE 1 X Y Z 1 4m 0 1.5m 2 0 -4m 1.5m 3 -4m 0 1.5m 4 0 4m 1.5m 5 0 0 5.5m 7. MEASUREMENTS 7.1 Measurement of extraneous noise Only the background noise shall be taken into account for the purpose of corrections. Background noise shall be recorded at the measuring points (see paragraph 6.4.2) with the appliance switched off, i.e. no sound emission (see paragraph 7.2). 7.2 Measurement of the sound pressure level LpA To measure the sound pressure level LpA, use shall be made of an instrument as defined in paragraph 5.2. If a sound level meter is used, 5 readings shall be taken at each measuring point. The mean value of these 5 readings shall be calculated in accordance with paragraph 11. If an integrating sound level meter is used, the integrating time shall be 15 seconds. 8. USE OF RESULTS 8.1 Calculation of root mean square values 8.1.1 Root mean square value at a measuring point The values obtained from the measurements referred to in paragraph 7.2 are root mean square values in time. 8.1.2 Root mean square value on the measuring surface The level corresponding to the root mean square value in space of the sound pressure levels for all the measuring points shall be calculated on the basis of the values established in accordance with paragraph 8.1.1. 8.2 Calculation of average extraneous noise level The average extraneous noise level over the measuring surface is obtained by applying the method described in paragraph 8.1.2 to the extraneous noise levels established at the different measuring points. 8.3 Calculation of the area S of the measuring surface The area S, expressed in m2, of the measuring surface is determined as follows- S = 2πR2 The area of the measuring surface may be calculated approximately. It should be noted that an error of ±20% in this area gives a deviation of ±1 dB in the value of the term- 10log10 S/So(surface level) 8.4 Calculation of the surface sound pressure level LpAm The surface sound pressure level is the level calculated in accordance with paragraph 8.1.2 and then corrected as described in paragraph 8.6. 8.5 Calculation of the sound power level LWA The sound power level LWA of the sound source is calculated by means of the following equation- LWA=LpAm+10log10 S/SoWhere- LWA = sound power level of the source tested, expressed in dB (see paragraph 3.4); LpAm = the surface sound pressure level, expressed in dB, as defined in paragraph 3.3; S = the area of the measuring surface in m2, calculated in accordance with paragraph 8.3;So = reference area of 1 m2. 8.6 Corrections to be made to measurements The average sound pressure level over the measurement surface, calculated in accordance with paragraph 8.1, shall be corrected, if necessary, to take account of the extraneous noise determined in accordance with paragraph 8.2. The correction K1 in dB, which shall be subtracted from the average sound pressure level over the measuring surface is given in the table below. Difference in dB between the sound pressure level calculated when the appliance is operating and the sound pressure level due to extraneous noise alone Correction K1 in dB less than 6 6 7 8 9 10 more than 10 no valid measurements 1.0 1.0 1.0 0.5 0.5 no correction To allow for tolerances, 5 dB(A) shall be deducted from the A-weighted sound power LWA determined for the appliance and the net result shall then be compared with the relevant standard. 9. DATA TO BE RECORDED A model report is provided in the Appendix. 10. DATA TO BE INCLUDED IN THE REPORT LAID DOWN IN PARAGRAPH 9 The data shall be reported in accordance with paragraph 9. The report shall state clearly that the sound power levels were obtained in accordance with the testing conditions. It shall specify that these sound power levels are given in A-weighted dB, reference 10-12 W. 11. METHOD OF CALCULATING THE AVERAGE LEVEL CORRESPONDING TO THE ROOT MEAN SQUARE VALUE OF THE VARIOUS SOUND PRESSURE LEVELS The root mean square value of the various sound pressure levels resulting from a series of measurements made at different points on the measuring surface (root mean square in space) can be determined by the following formula- LpAm=LpAo+10log10 1/n i = n ∑ gi i = 1Where- LpAi = the sound pressure level of the i-th measurement; LpAo = an auxiliary sound pressure level to simplify the calculation (for example, the smallest of the LpAi values); gi = the auxiliary variable for the i-th measurement- gi = 100.1(LpAi-LpAo). APPENDIX MODEL REPORT TEST REPORT FOR POWERED HAND HELD PERCUSSIVE BREAKERS 1. Test Article Manufacturer ................................................................................................................ Model ........................................................... Serial No. ............................................ Principal Dimensions ..................................................................................................... Description .................................................... Mass ................................................... Type: Compressed air, hydraulic, electric, petrol(1) 2. Operating Conditions(1) 2.1 Pneumatic Operating pressure ............................................................................................ pascals Air intake .......................................................................................................... m3/sec Striking rate ................................................................................................. strokes/sec Soundproofing device .................................................................................................... 2.2 Hydraulic Hydraulic fluid pressure ..................................................................................... pascals Striking rate ................................................................................................. strokes/sec 2.3 Electric Operating voltage .................................................................................................. volts Striking rate ................................................................................................. strokes/sec (1) Delete as appropriate. 2.4 Petrol Engine speed .......................................................................................................... rpm Make and type of silencer used (or fitted) ....................................................................... Striking rate ................................................................................................. strokes/sec Soundproofing device .................................................................................................... 3. Test Conditions Barometric pressure .................................... Ambient temperature ............................ Composition and dimensions of reflecting surface ............................................................ ..................................................................................................................................... Remarks ....................................................................................................................... 4. Equipment Microphone .................................................. Serial No. ............................................ Sound-level meter ......................................... Serial No. ............................................ Calibrating equipment ..................................... Serial No. ............................................ Miscellaneous (e.g. wind shield or recorder) .................................................................... Serial No. ............................................ 5 Test Set up diagram showing microphone locations and, if applicable, the direction of the exhaust and the position of any large objects situated less than 25 m from the appliance under test. 6 Acoustic data -area S in m2 of measuring surface and value of 10 log10 S/So; -sound-pressure levels measured at measuring points; -average sound-pressure level over measuring surface; -any corrections in decibels; -surface sound-pressure level LpAm; -sound-power level; -date and time of measurements. Cap 400D Sched 3 [regulation 8] FORM 1 NOISE CONTROL ORDINANCE (Chapter 400) APPLICATION FOR A NOISE EMISSION LABEL FOR HAND HELD PERCUSSIVE BREAKER Before completing this form read the Notes below. To: The Noise Control Authority 1. I hereby apply for a noise emission label for a hand held percussive breaker under the Noise Control Ordinance. In support of my application I submit the following information and particulars: 2. Details of Applicant 2a. Name (person or company): ................................................................................... ............................................................................................................................. 2b. H.K. Identity Card No. (if the applicant is an individual): .......................................... ............................................................................................................................. or Business Registration No. (if the applicant is a company): .................................... ............................................................................................................................. 2c. Correspondence address: ....................................................................................... ............................................................................................................................. 2d. Telephone No.: ...................................................................................................... 3. Information on hand held percussive breaker 3a. Name and address of manufacturer: ....................................................................... ............................................................................................................................. 3b. Name and address of manufacturer's authorized local representative (if any): ............ ............................................................................................................................. ............................................................................................................................. 3c. Trade name: .......................................................................................................... ............................................................................................................................. 3d. Model (see Note 1): ............................................................................................... 3e. Serial Number 1. 2. 3. 4. 5. Continue on separate sheet if necessary. Please state clearly each appliance serial number. 3f. Mass of breaker (see Note 2): ........................................................................... kg 3g. Supporting document (see Note 3): * EEC type-examination certificate/Noise testing report 4. Application fee (see Note 4) 4a. Number of noise emission labels applied for: ............................................................ 4b. Total fee payable: .................................................................................................. 5. Additional information Give any additional information which is thought to be relevant to this application: ............. .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... Dated this ............. day of ..................... 19 ....... Signed ..................................... Applicant. * Delete as necessary. NOTES: 1. The applicant shall fill in an application form for each model. 2. The applicant shall submit all relevant trade leaflets, brochures or similar documents for the Authority's consideration. 3. The applicant shall submit for the Authority's consideration either an EEC type-examination certificate or a noise testing report certificated by a corporate member of the Institute of Acoustics, UK, that the testing was conducted in accordance with the conditions as set out in Schedule 2 to the Noise Control (Hand Held Percussive Breakers) Regulations. 4. The applicant shall submit a fee of $405 for each label applied for. The fee payable on submission of this application will not be refunded. Cheques, drafts or cashier orders shall be made payable to "Hong Kong Government" and crossed. 5. Regulation 8(3) of the Noise Control (Hand Held Percussive Breakers) Regulations provides that not later than 28 days after an application is received by the Authority, the Authority shall issue a noise emission label or labels applied for or serve on the applicant written notice of his refusal to issue the label or labels, and if at the end of those 28 days he has done neither of those things, a label or labels shall be deemed to have been issued. 6. A noise emission label that is issued in consequence of misleading, false, wrong or incomplete information furnished by an applicant in connection with the application is liable to be cancelled. 7. The applicant is advised to read the Noise Control Ordinance and the Noise Control (Hand Held Percussive Breakers) Regulations. ______________________________________________________________________ FOR OFFICE USE ONLY ______________________________________________________________________ Permissible limit, dB(A) No. of labels issued 108 111 114 (Enacted 1991. L.N. 262 of 1994; L.N. 65 of 1995; L.N. 498 of 1996; L.N. 583 of 1997; L.N. 309 of 2000) Cap 400D Sched 4 NOISE EMISSION LABEL [regulation 6] (light green label) (Actual size 150 mm x 150 mm) (L.N.65 of 1995)
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