881-4027.9 * INSTALLATION AND OPERATING INSTRUCTIONS 8BT2 * Revision 04
11
Fig2. Wall opening for the transfer of hot gas pressure to the outside (from the lateral of the switchgear)
To make this arrangement on the wall, the reference point is the aisle at the front of the
switchgear ( 1500mm or 2241mm dimension) as shown on fig2. The aisle at the lateral
side of the switchgear (X dimension) determines the length of the outlet channel. It should be
specified during the order stage to be able to provide adequate channel.
NOTE!
Please see on page49 – 54 for the detailed information of the assembly of pressure relief
channels.
2.1.5. Protection against solid foreign objects, electric shock and water
8BT2 switchgear complies with the following degrees of protection according to IEC 60529:
• IP4X for switchgear enclosure of the operating front and the side walls
• IP2X for between compartments
Degree of
protection
Type of protection
IP4X
Protection against solid foreign objects: Protected against solid foreign objects, diameter > 1 mm.
Protection against electric shock: Protected against access to hazardous parts with a wire (the access probe
of 1 mm diameter shall not penetrate).
IP2X
Protection against solid foreign objects: Protected against solid foreign objects, diameter > 12.5 mm.
Protection against electric shock: Protected against access to hazardous parts with a finger (the jointed test
finger of 12 mm diameter, 80 mm length, shall have adequate clearance from hazardous parts).
2.1.6. Basic prescriptions and standards
IEC/EN Standard VDE Standard
Switchgear
62271-1
0670-1
62271-200
0671-200
Switching devices
Circuit-breakers
62271-100
0671-100
Disconnectors / Earthing switches
62271-102
0671-102
Voltage detecting systems
61243-5
0682-415
Insulation
60071-1
0111
Surge arresters
60099
0675
Degree of protection
60529
0470-1
Instrument transformers
Current transformers
60044-1
0414-1
Voltage transformers
60044-2
0414-2
Installation, erection
61936-1
0101
Environmental conditions
60721-3-3
DIN EN 60721-3-3
2.1.7. Electromagnetic compatibility - EMC
To achieve appropriate electromagnetic compatibility (EMC), some basic requirements
must be observed while erecting the switchgear. This applies especially to the
installation and connection of external cables and wires.
Basic measures for ensuring EMC are already taken during design and assembly of the
switchgear panels. Among other things, these measures include:
• the low-voltage compartment is an integral part of the panel, which means that the
protection and control devices with the internal wiring are metal-enclosed;
Pressure relief flaps
“Z-detail”
