METREL EasiPLUS MI 3000 User Manual

C Reduced low voltage supply systems
C.1 Standard reference
 BS7671
C.2 Fundamentals
Special supply systems are applied where inherent protection against 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 4.4.1 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.
The table below contains instrument functions intended for test and measurement of
supply systems with compatibility notes related to the reduced low voltage system.
Reduced low voltage system
functions
Notes
Contunuity functions
RLOW
Continuity
Independent of selected supply system.
Insulation
Independent of selected supply system.
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METREL EasiPLUS MI 3000 Specifications

General

Brand	METREL
Model	EasiPLUS MI 3000
Category	Test Equipment
Language	English