Electrical Installation Safety Trainer
AD 1 - MI 3399
68
4
Press the
START
key.
Expected results
This test should only be used in TN systems that do not have a RCD installed. If a RCD
is installed in a TN system the Z
S RCD
function should be used in order not to trip the
RCD.
The prospective fault current (I
PSC
) is calculated as:
𝑰
𝑷𝑭𝑪
=
𝑼
𝑵
𝒁
𝑴𝑬𝑨𝑺𝑼𝑹𝑬𝑫
where:
U
N
– nominal value, determined according to the measured voltage (U
L-PE
).
The measured
Z
LOOP
parameter is actually the reference impedance (Z
REF
) since all
measurements are done on the supply side. In a TN system the measured values
Z
LOOP
and
Z
LINE
should be equal (see chapter 1.4.3 for more details). In a TT system
Summary of Contents for MI 3399
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Page 46: ...Electrical Installation Safety Trainer AD 1 MI 3399 46 3 Exit settings...
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