Can anyone help me to identify the recommended maximum voltage levels in-between neutral and earth of TT system with relevant standard.
Can anyone help me to identify the recommended maximum voltage levels in-between neutral and earth of TT system with relevant standard.
Actually, in a building continuously indicate neutral to earth voltage as 10 to 11 V. Main cause for this is harmonics of VFDs. Hence , I want to know is there recommended maximum voltage levels in-between neutral and earth of TT system (with relevant standard reference). (In above mistakenly I wrote a minimum now I'll correct same.)
There are no recommendations of N-PE voltage from safety standards.
However, there are recommendations for EMC (although not from standards) - which have, in some cases, been as low as 5 to 10 V.
There is a solution to this ... although not without cost ... which is to use transformers to permit the filters to perform as they would in a TN system. This is recommended in the standards for VSDs, and also in BS EN 60204-1. The transformer secondary neutral is earthed, thus forming TN-S circuits in the TT installation.
There are no recommendations of N-PE voltage from safety standards.
However, there are recommendations for EMC (although not from standards) - which have, in some cases, been as low as 5 to 10 V.
There is a solution to this ... although not without cost ... which is to use transformers to permit the filters to perform as they would in a TN system. This is recommended in the standards for VSDs, and also in BS EN 60204-1. The transformer secondary neutral is earthed, thus forming TN-S circuits in the TT installation.
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