60198 SQUARE D, 60198 Datasheet - Page 86

• Manufacturer Part Number: 60198
• Description: MINIATURE CIRCUIT BREAKER 240V 30A
• Manufacturer: SQUARE D
• Series: Multi 9r

Specifications of 60198

• Rohs Compliant: YES
• Actuator Style: Toggle
• No. Of Poles: 3
• Current Rating: 30A
• Voltage Rating Vac: 240V
• Mounting Type: DIN Rail

86
Multi 9™ System Catalog
Section 8—Applications
07/2010
The IT Grounding System
This “ungrounded neutral” system has the following main features:
•
•
System characteristics and constraints upon installation:
•
•
•
•
Figure 65:
The TN-S Grounding System
This “multiple-grounded neutral” system has the following main features:
•
•
•
System characteristics and constraints upon installation:
•
•
•
•
NOTE: This grounding system is compulsory on premises where there is a risk of explosion
Figure 66:
The neutral point of the distribution transformer is ungrounded, or grounded by a high impedance
The installation frames are connected to the same grounding connection by the PE protective
conductor
The appearance of the first insulation fault is risk-free for people.
The appearance of the second insulation fault is dangerous to people, and thus requires tripping.
If the application frames and the transformer frame are not all connected to the same ground
connection, an RCD must be placed at the incoming end of the installation.
The standard stipulates the installation of a Continuous Insulation Monitor (CIM) at the incoming
end of the installation.
The neutral point of the distribution transformer is grounded.
All installation frames are grounded by a PE protective conductor.
The PE protective conductors and the N neutral conductor are separate.
Allows tripping on the first fault via an overcurrent protection device.
Use of an RCD, although not compulsory, is recommended.
Requires calculation, sometimes complex, of loop impedance.
Tripping of the protection devices must be checked when these devices are installed, B curve is
recommended.
IT Grounding System Without Residual Current Device (RCD)
CIM
IT Grounding Systems
TN-S Grounding System
1
2
3
N
PE
CIM
IT Grounding System With Residual Current
Device (RCD) at the Incoming End of the Installation
1
2
3
N
PE
RCD
© 2002–2010 Schneider Electric
PE
All Rights Reserved
PE
1
2
3
N