60118 SQUARE D, 60118 Datasheet - Page 85

• Manufacturer Part Number: 60118
• Description: MINIATURE CIRCUIT BREAKER 120V 1A
• Manufacturer: SQUARE D
• Series: Multi 9r

Specifications of 60118

• Actuator Style: Toggle
• No. Of Poles: 1
• Current Rating: 1A
• Voltage Rating Vac: 240V
• Mounting Type: DIN Rail
• Rohs Compliant: Yes

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Typical IEC Grounding Systems
All electrical installations complying with safety standards and regulations are grounded in order to
protect people and equipment. The term “grounding system” standardizes the grounding method used
in the installation. The grounding system runs:
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•
The IEC 364 (Section 3) Standard defines three types of grounding systems: TT, IT and TN-C or TN-S.
Codification of the Grounding Systems
Grounding systems are referred to by two or three letters
•
•
•
The TT Grounded Neutral System
This “directly-grounded neutral” system is the easiest to install, monitor and use. Main features are:
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•
•
System characteristics upon installation:
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Figure 64:
First, from the neutral of the secondary side of the transformer,
Next, from the installation frames.
1st letter—Status of the neutral of the transformer or source:
— I: Ungrounded
— T: Grounded
2nd letter—Status of the electrical frames of the loads:
— T: Grounded
— N: Connected to neutral
3rd letter—Status of the neutral (N) and the protective conductor (PE):
— S: N and PE are separate
— C: N and PE are in the same conductor (PEN)
The neutral point of the distribution transformer is directly grounded.
The installation frames are connected to several ground connections by the PE protective
conductor.
The frame and neutral ground connections are separate.
Tripping is compulsory on the first fault.
Thus, at least one RCD is necessary at the incoming end of the installation.
If the load frames are not all connected to the same grounding connection, one RCD must be
installed for each set of equipment.
TT Grounding System with Residual Current
Device (RCD) at the Incoming End of the Installation
RCD
TT Grounding Systems
PE
1
2
3
N
TT Grounding System with One Residual
Current Device (RCD) for Each Set of Equipment
T N S
RCD
Multi 9™ System Catalog
for example:
PE
Section 8—Applications
RCD
PE
07/2010
RCD
1
2
3
N
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