3.
If from any point the installation separate conductors provide the neutral and protective
functions, inadmissible connect these conductors each other from that point. For that purpose:
− protective conductors shall suitably protected against mechanical and chemical
deterioration and electrodynamic forces;
− switching device shall inserted the protective conductor;
− switching disconnecting protective conductor permitted only case when all
conductors relevant circuit are disconnected the same time;
− when disconnecting the protective conductor socket outlet, this conductor shall be
disconnected later and connected sooner than other conductors the circuit passing through
the socket outlet;
.
6. shall considered that residual current-
operated device can not protect parts installation where PEN conductor used. the sheaths, screens and armouring certain cables;
− metal conduits other metal enclosures for conductors;
− certain extraneous conductive parts, e. This conductor identified the letters PEN (PE for
protective conductor, for neutral conductor).1 PEN conductor
In systems, for cables fixed installations having cross-sectional area not less than 10
mm2 for copper and mm2 for aluminium, single conductor may serve both protective
conductor and neutral conductor.g. the
point separation, separate terminals bars shall provided for the protective and neutral
conductors.
Extraneous conductive parts shall not used PEN conductor.g.CONSTRUCTION ELECTRICAL INSTALLATION AND EQUIPMENT
60
− mm2 mechanical protection not provided.2 Preservation electrical continuity protective conductors
Protective conductor shall preserve its ability conductively connect exposed conductive
parts, extraneous conductive parts with earth under any circumstances when electrical equipment
and appliances are connected the installation. metal constructions buildings, metal tubes,
pipes, metal enclosures frames.
6.
− Protective conductor may comprise:
− conductors multicore cables;
− insulated bare conductors common enclosure with live conductors;
− fixed bare insulated conductors;
− metal coverings, e. The PEN conductor shall connected the terminal bar intended for the
protective conductor.3
