Delta RPI Series - Permitted Earthing Systems

The AC voltage should be as followings:
3P3W 3P4W
L1-L2: 400 Vac ± 20% L1-N: 230 Vac ± 20%
L1-L3: 400 Vac ± 20% L2-N: 230 Vac ± 20%
L2-L3: 400 Vac ± 20% L3-N: 230 Vac ± 20%
After wiring, installer should choose the AC connection type on the control
panel. About setting, please refer to 5.2.7 Install Settings.
TT is not recommended. The voltage of N has to be very close to PE.
(difference <20 V
rms)
Earthing system TN-S
Permitted Yes
TN-C
Yes
TN-C-S
Yes
TT
Yes
IT
No
4.2.2 Permitted earthing systems
27
Wiring