Grounding; Surge Protector Equipped Terminal Block (Optional); Common Mode Voltages - ABB 266HSH Operating Instructions Manual

6.5 Grounding

Pressure transmitter housing should be grounded or earthed in
accordance with national and local electrical codes. Ground
connection is mandatory for surge protector equipped devices
in order to ensure proper functioning.
Protective grounding terminals (PE) are available outside and/or
inside the housing of the transmitter. Both ground terminals are
electrically connected and it up to the user to decide which one
to use. The most effective transmitter case grounding method
is direct connection to earth ground with impedance equal or
less of 5 ohm.
Figure 11: Ground connection on transmitter housing
6.6 Surge protector equipped terminal block
(optional)
The pressure transmitter housing with surge protector (code
S2) inside the terminal board must be connected using the
grounding terminal (PE), by means of a short connection with
the equipotential bonding.
Equipotential bonding conductor must to have 4 mm2 of
maximum cross-section.
Important. Test voltage withstand capability can no longer be
ensured when this protective circuit is used.

6.7 Common mode voltages

266 pressure transmitter operates within the specified levels of
accuracy for common-mode voltages of up to 250V between
lines and housing grounded and up to 150V not grounded.
16 OI/266/LowP-EN Rev.A | 2600T Series Pressure transmitters
6 Transmitter wiring