SMY133-SMY134-SMP133 Operating Manual
The instrument’s position must be fixed with locks.
Natural air circulation should be provided inside the distribution board cabinet and in the instrument’s
neighbourhood no other instrumentation should be installed.
Fig. 2.1b : Space around the Instrument
Especially underneath the instrument, no other instrumentation that is source of heat should be
installed or the temperature value measured may be false.
2.3 Instrument Connection
2.3.1 Safety Grounding (SMP133 only)
As the SMP133 is safety class I type instrument, it must be grounded.
The instrument is equipped with the faston-type terminal 6.3 x 0.8 mm, marked
(sometimes
referenced as
PE
-terminal).Corresponding crimp-type receptacle is delivered with the instrument as
standard accessory.
Fig. 2.2 : SMP 133 Grounding
The terminal must be connected with the PE (or PEN) protection ground conductor (bare or with
green/yellow coloured insulation).
Recommended wire type :
H07V-U (CY)
Recommended minimum conductor cross-section : 2.5 mm
2
Maximum conductor cross-section :
4 mm
2
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