Yokogawa GD40 Gas Density Detector - Manual (Page 43)

<2. Installation, Wiring and Piping>
2-20
IM 11T3E1-01E
2.4.6 Cables Wired to the Ground
When using the GD40R detector in an area requiring explosion protection, BE SURE to ground it
as per the Class A Grounding Standard using a conductor of at least 2 mm 2 in nominal thickness.
Also BE SURE to ground the GD402 converter as per the Class D Grounding Standard.
In the case of using GD40T detector, Intrinsically Safe Grounding shall comply with National
Electrical Code ANSI / NFPA 70 and Local Electrical Codes.
In the case of using GD40V detector, Intrinsically Safe Grounding shall comply with Canadian
Electrical Code and Local Electrical Codes.
Use No. 26 internal wiring terminals or the grounding terminals of the converter. (The appropriate
tightening torque for the internal wiring terminals is 0.4 N·m). When using the detector’s ground-
ing terminals, attach M4 crimp terminals to the ends of the grounding cables. When crimping the
terminals, use tools that fit the terminals.
Earth cable
F0221.ai
Terminal Joining advice of Converter
case ground terminal
Converter case
Ground wiring
crimp terminal Lock washer
Ground terminal
Earthing of internal wiring terminal Earthing of enclosure wiring terminal
24 26 25
L N
Figure 2.17 Power and Ground Wiring