Air Products GASGUARD TE10, Installation, Operation And Maintenance Manual

Page: 82 / 196

GASGUARD
®
TE10 Distribution System Manual
Air Products and Chemicals, Inc. Page 4 - 2
4.1 Grounding Method
The equipment must be grounded in accordance with Article 250 - Grounding in the
National Electrical Code 1993, if installed in the United States. The customer is
responsible for connections to earth ground. A ground lug is supplied on the controller
as well as the plenum of the gas cabinet for customer hookup to the facilities grounding
network. Figure 4.1 shows a suggested grounding method for a typical system. This
drawing may not be applicable to your specific system.
Figure 4.1: Suggested Grounding Method
Use #4 AWG ground wire for non EMI/RFI protected systems, installed in the United
States. Use Alpha #1239, 1-3/8” flat braid or equivalent for EMI/RFI protected and
CE marked systems. Total length not to exceed 10 feet (3 meters).
After grounding the overall resistance must be measured. This resistance for the
equipment ground to the grounding electrode can not exceed one ohm (1
Ω
). Check the
effectiveness of grounding by attaching a wire to the nearest grounding electrode and
connect an ohmmeter in between the reference ground wire and the enclosure.
For 1X1 and 1X2 cabinet configurations each cabinet requires grounding to earth
ground.
NOTE 1: USE #4 AWG (25 mm) WIRE FOR NON-EMI/RFI SYSTEMS.
USE ALPHA #1239, 1-3/8” (35 mm) FLAT BRAID OR EQUIVALENT FOR EMI/RFI
PROTECTED SYSTEMS. TOTAL LENGTH NOT TO EXCEED 10’ –0” (3 M).