User's Manual

Chapter 3 — System and site requirements Page 49 of 332
Option 11C Mini Planning and Installation Guide
• All conductors must terminate in a permanent way. Make sure all
terminations are easily visible and available for maintenance purposes.
• Tag ground connections with a clear message such as “CRITICAL
CONNECTION: DO NOT REMOVE OR DISCONNECT”.
Table 10
Area-specific grounding wire requirements
Area Grounding wire requirements
Germany #8 AWG (10 mm
2
) green/yellow wire
Other areas in Europe not smaller than #6 AWG (16 mm
2
) at any
point
UK two green/yellow wires no thinner than two
10 mm
2
CAUTION
For an installed Option 11C Mini, the impedance of the link between
the ground post of the Main Chassis and the single point ground to
which it connects must be less than 0.25 Ohms.
CAUTION
Transients in supply conductors and ground systems can damage
integrated circuits. This damage can result in unreliable Option 11C
Mini operation. Damage caused by transients is not always
immediately apparent. Degradation can occur over a period of time.