I know this has been discussed numerous tines here and elsewhere.
Can someone confirm or forward a link that states it's regulation to use a contactor OR a permanent bond when in islanding mode?
I've been using the ATS 230 v relay to switch a contactor to bond earth and neutral.
Some blokes say what if contactor fails?
Is it clearly regulations that you cannot make a permanent bond?
Please advise
The inverter output might fail as well. What then ?
I cannot tell you were it states it must be a permanent bond - I can show you were it states it may not be a permanent bondOriginally Posted by Delta
SANS 10142-1 ed3.1
6.1.6 The neutral conductor shall not be connected direct to earth or to the
earth continuity conductor on the load side of the point of control except as
allowed in 7.16.4.
7.12.3.1.3 Where alternative supplies are installed remotely from the
installation, or from one another, and where it is not possible to make use of
a single neutral bar or neutral conductor which is earthed, the neutral of each
unit shall be earthed at the unit and these points shall be bonded to the
consumer's earth terminal (see 6.12.4). The supply from each unit which
supplies the installation or part of the installation, shall be switched by means
of a switch that breaks all live conductors operating substantially together
(see figures P.2 and P.4), to disconnect the earthed neutral point from the
installation neutral when the alternative supply is not connected (see also
6.1.6).
7.16.4 Neutral earthing
7.16.4.1 Whereas TN-C systems may be implemented along the distribution
system backbone, the individual service connections at every distribution
kiosk shall be TN-S.
7.16.4.2 From the point of supply to each user or part of a communal
installation, the neutral and earth conductors shall be separate conductors.
7.16.4.3 Wherever the neutral is connected to the earth, a warning notice
shall be fitted to the outside of each distribution kiosk in the distribution
system, indicating "Neutral earthed inside".
7.16.4.4 A clear notice shall be fitted at the combined neutral-earth
connection inside each distribution kiosk in the distribution system, that
prohibits the removal of this connection while the supply is alive, or might
become alive.
7.16.4.5 The neutral shall not be earthed beyond any earth leakage unit.
7.16.4.6 A TN-S system shall not be converted to a TN-C system.
That is why I suggested to the inverter manufacturer, that they should make it fail safe and because the inverters are now so smart they could send you a notification indicating that the relay has failed.
not true - misleading at best - this sans 10142 is a joke and the klevva klevvas that pins it down.
Which statement is not true in your opinion - permanent or relay
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