Patton electronic user manual Connecting power, Grounding the Model SN4900-AC and DC units

SmartNode 4900 User Manual 3 • Hardware installation

Table 8. Serial port pin-outs

V.35 Interface (DB-25)

24 XTC-a (to DCE)

X.21 interface (DB-15)

Note Some NTUs have non-standard connections and require special cables. Consult the NTU maker’s product documentation

Connecting power

In connecting to the power source, it is important to establish a good grounding connection first, then the power connection. This section explains:

•Making the ground connection for either AC or DC units (see section “Grounding the Model SN4900— AC and DC units”)

•Connecting to an AC power source (see “Installing the power cables—AC units” on page 33)

•Connecting to a DC power source (see “Installing the power cables—DC units” on page 34)

Grounding the Model SN4900—AC and DC units

Do the following:

1.Assemble a ground wire using #10 AWG wire with green-colored insulation and two ring terminals. Make the wire long enough to reach one of the following earth ground sources:

–The building ground rod (generally located at the site’s main service entrance)

–A sprinkler system pipe

–A cold-water pipe

–Building structural steel

Power cable retainer clip

IEC-320 connector

(2 places)

Grounding stud

Figure 11. IEC-320 connector and grounding stud locations

2.Install the grounding wire between the grounding stud (see figure 11) and the grounding source.

Installing the IpChannel Bank 32