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2 - Fagor Automation

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TN type mains<br />

Distribution diagram that has a point connected directly to ground. The<br />

conductive parts of the installation are connected to this point through<br />

ground protection wires. This type of mains admits loads between one or<br />

several phases and the neuter.<br />

FACTORY LINE<br />

TRANSFORMER<br />

L1<br />

L2<br />

L3<br />

PEN<br />

DIFFERENTIAL<br />

BREAKER<br />

DIFFERENTIAL<br />

BREAKER<br />

DIFFERENTIAL<br />

BREAKER<br />

MAINS<br />

FILTER<br />

A<br />

F. H6/4<br />

Installation diagram in TN-C type mains.<br />

MAINS<br />

FILTER<br />

A<br />

MAINS<br />

FILTER<br />

A<br />

There are three types of TN systems depending on the protection neuter<br />

and ground combination:<br />

TN-S diagram where the neuter and the ground protection conductors<br />

are separated throughout the whole length of the system.<br />

TN-C-S diagram where the neuter and the ground protection wire are<br />

combined in a single conductor somewhere in the system.<br />

TN-C diagram where the neuter and the ground protection functions<br />

are combined in a single conductor throughout the system.<br />

INFORMATION. TN type mains are the only ones to which the DDS system<br />

can be connected either directly or through an auto-transformer.<br />

See diagram of figure F. H6/4 for properly installing the DDS system with<br />

TN-C type mains distribution.<br />

Power line connection<br />

DDS DDS<br />

DDS<br />

POWER LINE CONNECTION<br />

Types of mains 6.<br />

DDS<br />

HARDWARE<br />

Ref.1307<br />

243

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