Table I
| |||
---|---|---|---|
(Instruments calibrated in frequency bands shown in the first
column below.)
| |||
Lower Limiting/Upper Limiting Frequencies
(Hz)
|
Maximum Permitted Sound-Pressure Level
(decibels re 0.0002 microbar)
| ||
A.
|
Originating at light industrial, commercial or business use
or activity:
| ||
20 to 75
|
74
| ||
75 to 150
|
67
| ||
150 to 300
|
61
| ||
300 to 600
|
55
| ||
600 to 1,200
|
50
| ||
1,200 to 2,400
|
45
| ||
2,400 to 4,800
|
41
| ||
4,800 to 9,600
|
38
| ||
B.
|
Originating at heavy industry, manufacturing:
| ||
27 to 75
|
82
| ||
75 to 150
|
75
| ||
150 to 300
|
70
| ||
300 to 600
|
64
| ||
600 to 1,200
|
58
| ||
1,200 to 2,400
|
53
| ||
2,400 to 4,800
|
49
| ||
4,800 to 9,600
|
46
|
Table II
| |||
---|---|---|---|
(Instruments calibrated in preferred center frequencies shown
in the first column below.)
| |||
Octave Band Center Frequencies
(Hz)
|
Maximum Permitted Sound-Pressure Level
(decibels re 0.0002 microbar)
| ||
A.
|
Originating at light industrial, commercial or business use
or activity:
| ||
31.5
|
74
| ||
63
|
71
| ||
125
|
65
| ||
250
|
59
| ||
500
|
53
| ||
1,000
|
48
| ||
2,000
|
44
| ||
4,000
|
40
| ||
8,000
|
37
| ||
B.
|
Originating at heavy industry, manufacturing:
| ||
31.5
|
82
| ||
63
|
79
| ||
125
|
73
| ||
250
|
68
| ||
500
|
62
| ||
1,000
|
57
| ||
2,000
|
52
| ||
4,000
|
48
| ||
8,000
|
44
|