Chapter 3 Electrical Supply Installation 49
Dual Grounding Environment
Caution – Tobe compatible with grounding environments requiring isolation
between logic 0V and chassis ground, the fitted groundingbridge plate must be
removed and individual connections made to logic 0V and chassis ground studs.
The grounding bridge plate is located on the middle rear left edge of the unit
between the motherboards. The grounding studs at the base of the chassis are M5
studs with appropriate nuts already installed.
Before installation for dual grounding systems, remove the link fromthe chassis to
logic 0V.This exposes a 2-hole lug with tapped M5 threads (refer to FIGURE 3-3).
Caution – The use of certain PCI cards causes the frame and logic grounds to be
commoned. Refer to the documentation supplied with the PCI card.

▼To Connect the Ground Lead

1. Strip 9mm of insulation from each end of the grounding lead.
2. Insert the lead into the Thomas & Betts two-hole lug provided (part no. 52024-UB).
Ensure that both the conductor and its insulation are gripped by the lug.
3. Position the lug and grounding lead assembly over the grounding studs.
Refer to FIGURE3-3 on page3-50. Tighten the two M5 nuts over the locking washers
provided.
4. Make the connection to the earthing bar at the end of the grounding lead.
Ensure there is adequate strain relief for the cable.