SDMO R44C3 User Manual

3.5.3 TT system
R
Ph 1
Ph 2
Ph 3
N
PE
R
R
Neutral connected
to earth T
Ground connected
to earth T
Neutral
earth
Ground
earth
R
Ph 1
Ph 2
Ph 3
N
PE
R
id
id
id
Figure 3.2: TT neutral system.
The alternator neutral is earthed, and the grounds of the user equipment have their own earth connection.
In the TT system, automatic power cut-off via a Residual Current Device (RCD) is obligatory at the upstream part of the facility, to
ensure protection of personnel (with a maximum 30 mA device on outlet circuits).
3.5.4 Differential protection
In order to ensure that people are protected from electric shocks from the TT system, the generating set is equipped with a residual
current device: this can be fixed or adjustable depending on the option chosen.
• If the generating set's residual current device is not adjustable and the activation threshold has been set at 30 mA, all terminal
circuits in use are protected.
• If the generating set's residual current device is not adjustable and the activation threshold has been set at 300 mA, a 30mA
residual current device must be added to each of the circuit outlets in use.
• If the generating set's residual current device is adjustable, (located upstream) this must be above those devices located
downstream (terminal circuits); this means that continuity on clean circuits will be maintained in the event of a fault on one of
the terminal circuits.
Example:
Any change to the setting on the generating set's residual current device could pose a risk to personal safety.
The user will be held liable - any changes must only be made by trained, qualified engineers.
When the generating set is disconnected from an installation after use, the general residual current device
must be restored to factory settings by a qualified engineer who can then check this.
Important
Generating set's residual
current device
Residual current device
Terminal circuit 1
Residual current device
Terminal circuit 2
Residual current device
Terminal circuit 3
300mA
30mA
30mA
30mA
Generating set
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SDMO R44C3 Specifications

General

Brand	SDMO
Model	R44C3
Category	Inverter
Language	English