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Metrel MI 3102 BT - Eurotest XE Manual

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MI3002 MI3100 MI3102 Reduced low voltage supply systems
97
C Reduced low voltage supply systems
C.1 Standard reference
BS7671
C.2 Fundamentals
Special supply systems are applied where inherent protection to electric shock is
required but no SELV used. Reduced low voltage supply with ground reference can be
used for this purpose.
There are two options with 110 V nominal voltage.
55 V
55 V
PE
L1
L2
110 V
63 V
63 V
L1
L2
110 V
63 V
L3
110 V
110 V
Single phase with center tap
connected to PE (i.e. 2 x 55 V).
No neutral line.
Three phase star connection, center
tap connected to PE (i.e. 3 x 63 V).
No neutral line.
Figure C.1: General reduced low voltage supply systems
C.3 Measurement guides
The user has to select the reduced low voltage supply system in the instrument before
testing it. The procedure for selecting the reduced low voltage supply system is defined
in chapter 4.5.1 Supply system setup. Once the reduced low voltage system is selected
the instrument can be used immediately. The instrument keeps selected reduced low
voltage system when it is turned off.
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