Bus bar system has lower connection space generally fitted with 4 bus bars for 4 TN-C and TT-networks and lower fifth bus bar required for TN-S networks can be fitted retrospectively

摘要

The system has networks of 4-wire systems for TN-C networks with PEN conductor systems above and N-conductor rails above for TT networks and 5 wire systems for TN-S networks with N-conductor rails above and PE-conductor rails below. The lower connection space is generally fitted with 4 bus bars for TN-C and TT-networks. The lower fifth bus bar for TN-S networks can be fitted retrospectively without changing/converting the lower connection chamber.