Operating & Mounting instructions – 8 074 143.03/03 – Page 101
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Domestic premises:
The standard calls those establishments „first enviroment“. Drives that are connected without an
intermediate transformer to the public power network supplying residential areas. The valid
interference limits are very low and can only be observed by keeping all installation requirements.
Industrial premises:
The standard refers to such environments as “second environment”. These are areas that are
separated from the public power network by separate transformer.
If the neighbouring network is a public network for residential areas, the stricter limits 66-56 / 56 /
60 dB(µV) quasi-peak must be complied with. In industrial networks, the higher limits 79 / 73 / 73
dB(µV) quasi-peak can be used.
Moreover, in the case of an influence on other devices, suppression of the interference is required.
This suppression is the plant owner’s responsibility.
The limits for immunity are much stricter, since a higher level of interference has the be assumed.
In non-grounded mains, compliance with the limits is usually not possible. Filter capacitors
complicate the detection of insulation faults, and thus interfere with the concept of an earth-free
energy supply. Filters
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