Grundfos NK Series Installation And Operating Instructions Manual page 709

Appendix
Sound pressure levels
The data in this table applies for pump including motor,
(MG, MMG, Siemens and TECO motors).
The values stated are maximum sound pressure levels.
Tolerances are according to ISO 4871.
50 Hz
-1
2-pole: n = 2900 min
-1
4-pole: n = 1450 min
-1
6-pole: n = 970 min
Maximum sound pressure level [dB(A)] - ISO 3743
Motor
Three-phase motors
[kW]
2-pole
0.25 56
0.37 56
0.55 57
0.75 56
1.1 59
1.5 58
2.2 60
3 59
4 63
5.5 63
7.5 60
11 60
15 60
18.5 60
22 66
30 71
37 71
45 71
55 71
75 73
90 73
110 76
132 76
160 76
200 76
250 82
315 82
355 77
400 -
4-pole 6-pole
41 -
45 -
42 40
42 43
50 43
50 47
52 52
52 63
54 63
57 63
58 66
60 66
60 66
63 66
63 66
65 59
66 60
66 58
67 58
70 61
70 61
70 61
70 61
70 65
70 -
73 -
73 -
75 -
75
60 Hz
-1
2-pole: n = 3500 min
-1
4-pole: n = 1750 min
-1
6-pole: n = 1170 min
Maximum sound pressure level [dB(A)] - ISO 3743
Motor
Three-phase motor
[kW]
2-pole
0.25 -
0.37 -
0.55 -
0.75 -
1.1 64
1.5 64
2.2 65
3 54
4 68
5.5 68
7.5 73
11 70
15 70
18.5 70
22 70
30 71
37 71
45 75
55 75
75 77
90 77
110 81
132 81
160 81
200 81
280 86
288 -
353 86
362 -
398 81
408 -
460 -
1
4-pole 6-pole
- -
- -
- -
- -
51 43
52 47
55 52
57 63
56 63
62 63
62 66
66 66
66 66
63 66
63 66
65 62
65 63
65 62
68 62
71 66
71 66
75 66
75 66
75 69
75 -
- -
77 -
- -
77 -
79 -
79 -
709