METREL MI 3399, Instruction Manual With Exercises

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Electrical Safety and Quality ApplicationTrainer - Introduction MI 3399
22
4.5 Meaning of abbreviations on MI 3399 Application
Trainer
3 Phase / 1 Phase Mains Plug
F 0 / 1 Direct Power Sockets
3-pin / 12V Charging Sockets
SB 1/2 Earthing Systems TN/TT
SB 3 IT Earthing / Special locations
LPS Lightning Protection System
F 0/1 outlet Bypass outlet - connected in parallel to mains and not through
electronic circuits
for supplying different loads and
instruments .
F 1/2 Three phase Outlet for test purpose only and not for
supplying different loads!
F 1/3 2/2 3/1 3/2 Single phase Outlets for test purpose only and not for
supplying different loads!
F 1/4 Light Circuit
UTP LAN sockets for testing communication network parameters,
errors, faults and distances to the faults and crosstalk.
N-PE TN/TT Open / Short switch to simulate real conditions on both
types of earthing systems.
Pipes
Pipes of water, Gas and Heating systems are connected to MPE
through switches and resistors to simulate safety conditions
close to limit values.
Gas Pipe Surge
protection Gas pipe has insulator in between field pipe and in-building
pipes. The Surge protection shows good example to make
system safe in case of lightning strike.
MPE Main Potential Equalizing
Re Auxiliary rod 1 (Inner Ring)
Re Auxiliary rod 2 (Inner Ring)
Ro Current probe 1 (Outer Ring)
Ro Potential probe 1 (Outer Ring)
Ro Potential probe 2 (Outer Ring)
Ro Current probe 2 (Outer Ring)