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Chapter 3 Environment description and installation
3.3.4 Safety and EMC: Good wiring practice IP20 models
L1
L2
415V 50Hz
3-phase + N
Power supply
* 10mm
L3
N
E/Ground
2
4mm2
BACK PLATE
(paint/coating free)
L1(L)
L3(N)
PE
iDrive
EDX-220-21-E
(for example)
P N T1 T2
Optional ferrite
choke, only required
if motor cable is
very long.
Note: For very long
cables an ACR
should be used
T3
PE
4mm2
ENCLOSURE
Brass earth studs
fixed through
back plate and
secured with
shake-proof
washers.
NB. Both ‘PE’
terminals must be
linked to back
plate with
4mm2 (min) cable
as shown.
**
* NOTE 1
External earth /
ground conductor
if used.
Enclosure (& backplate) must
be connected to main earth system
by single 10mm2 c.s.a. copper
conductor to conform to BS7671
Earth / ground
cables connected
through isolator
Local
Isolator
** NOTE 2
Armoured or
screened cable,
3C or 4C.
Screen
connected at all
ends as shown.
Motor
Note: Power supply side ancillary equipment
not shown in this diagram, for clarity.
3-11
**
Screen / armour must
be connected as shown
at each end of cable
sections.
If motor connection
box is plastic, screen
must be secured to the
metal frame of the
motor.