Grounding; Protective Grounding; Integrated Lightening Protection - ABB 266 HART Operating Instruction

Assembling and connecting the socket connector
The socket connector for connecting the cable is supplied unassembled as an accessory for the transmitter.
– The contacts (2) are crimped or soldered onto the cable ends (wire cross section of 0.75 ... 1 mm2 (AWG 18 ... AWG 17)),
from which approx. 1.5 ... 2 cm (0.59 ... 0.79 inch) of the sleeve and approx. 8 mm (0.32 inch) of the insulation have been
stripped; they are then inserted into the socket (1) from the rear.
– Slide the set screw (6), clamping ring (5), gasket (4), and housing (3) onto the cable
(you may have to adjust the gasket (4) to fit the cable diameter).
Important
Before you press the contacts completely into the socket, check the connection points again. Incorrectly inserted contacts can be removed by using a
press-out tool (part no.: 0949 813), or a standard ballpoint pen as a makeshift tool. Please observe the connection diagram included with the plug.
Figure 37: Socket connector components

Grounding

A terminal is available on both the outside of the housing and in the plug for grounding (PE) the transmitter. Both terminals are
electrically connected to one another.

Protective Grounding

All transmitters are supplied with an external ground connection
for protective grounding.
Wire this ground connection to a suitable earth ground. For a
transmitter measuring loop an earth ground should maintain a
resistance of 5 ohms or less.
Use a heavy duty conductor, at least 15 AWG / 1,6 mm
Warning - General risks
A protective grounding connection is absolutely necessary to insure
personnel protection, to protect against surge (in case of installation
of this option) and to prevent explosions in potentially explosive
environment.
Integrated lightning protection (optional)
The transmitter housing must be connected using the grounding terminal (PA), by means of a short connection with the equipotential
bonding. Equipotential bonding minimum diameter of 4 mm
In the case of transmitters with integrated lightning protection (optional), the intrinsically safe circuit is connected to the equipotential
bonding for safety reasons.
Important
Test voltage withstand capability can no longer be ensured when this protective circuit is used.
1 - Socket
2 - Contact
3 - Housing
4 - Gasket (can be cut)
5 - Clamping ring
6 - PG 11 set screw
7 - Cable (diameter 5 - 11 mm or 0.20 - 0.43 inch)
2 Ø.
Figure 38: Ground connection on transmitter housing
2 (AWG 12) is required throughout the cable routing area.
2600T Series Pressure transmitters | OI/266/HART-EN Rev. D 31
in the order indicated before assembly