098-00564-000 Revision A3 – July, 2013
TimeProvider 2300/2700 User’s Guide
47
Chapter 2 Installing
Making Ground and Power Connections
Figure 2-9.
Universal Ground Symbol
After installing the TimeProvider 2300/2700 into the rack, connect the chassis to the
proper grounding zone or master ground bar. The DC version of the TimeProvider
2300/2700 can be part of a Common Bonding network (CBN) or an Isolated
Bonding network (IBN). The AC version of the TimeProvider 2300/2700 can only be
part of a CBN. The System is to be connected as a DC-I configuration. All bonding
and grounding connection shall be made of copper (tinned or untinned), per
GR-1089, R9-17 [82].
Run a 16 AWG green/yellow-striped insulated wire from the TimeProvider
2300/2700 grounding terminal to the earth Ground on the rack. The rack grounding
method is below.
1. Crimp the customer-supplied UL listed Ring Lug to one end of the 16 AWG wire.
Connect the ring lug to the ground terminal on the left side of the front panel
using the supplied M4 Kept machine nut, tightening to a torque value of 15.95
in-lbs. The surface of the TimeProvider 2300/2700 earth grounding terminal must
be clean of contaminants and oxidation.
2. Crimp the appropriate customer-supplied UL listed Ring Lug to the other end of
the 1 mm² / 16 AWG green/yellow-striped wire. Remove the paint and sand the
area around the screw hole to ensure the proper conductivity. Coat the
connection with an electrically conductive antioxidant compound such as
Kopr-shield spray. Connect this Ring Lug to the rack with appropriate customer
supplied screws and external star lock washers, tightening to a torque value of
53.45 in-lbs.
3. Using a digital voltmeter, measure between the ground and chassis and verify
that no voltage exists between them.
Note:
If only one ground connection is to be used,
Symmetricom recommends connecting to the frame ground
connection closest to the power connector (AC or DC).
Recommendation:
Although there are a number of methods for
connecting the equipment to earth ground, Symmetricom
recommends running a cable of the shortest possible length from the
ground lug to earth ground.