Installing Power Supply Units
33
Relaying AC mains power to other PSUs
Warning! The total current draw of all the Exterior 50 & 100 PSUs
that draw power from an AC power source in one interconnected
chain must not exceed 16 amps.
Exterior 50 & 100 PSUs can be interconnected in a chain so that they all
draw AC mains power via the first PSU, but the following points must be
respected:
• Connect only Exterior 50 & 100 PSU devices in the chain. Do not
connect any other device to power via an Exterior 50 & 100 PSU.
• The cable used for power throughput must meet the same
specifications as power input cable (see page 9).
To continue the AC mains power link from one Exterior 50 & 100 PSU to
another:
1. Obtain a suitable power cable (see above) to use for power
throughput.
2. See Figure 10. Prepare the power throughput cable for connection to
the first PSU by stripping the last 50 mm (2 ins.) of the outer cable
jacket, then stripping the last 10 mm (0.4 ins.) of the insulation from
the ground/earth, the neutral and the live wires. The use of ferrules (I-
type end caps) is recommended.
3. See ”Installing a cable in a cable gland” on page 23. Pass the power
throughput cable through the cable gland marked
100-240 VAC Line
2
on the PSU.
4. See Figure 10. Connect the wires from the power input cable to the
quick-lock terminals in the PSU as follows:
• Connect the ground/protective earth wire to the terminal marked
PE
.
• Connect the neutral wire to the terminal marked
N
.
• Connect the live wire to the terminal marked
L
.
5. Tighten the cable gland as described in ”Installing a cable in a cable
6. Install the AC mains power throughput cable in the same terminals
used for AC mains power input in the first PSU using ”AC mains power
input” starting on page 30 as a guide. Use the cable gland marked
100-240 VAC Line 2
for power throughput cable exit from the PSU.
7. Run the power throughput cable to the next PSU and install it as if it
was a power input cable using ”AC mains power input” starting on
page 30 as a guide.
8. To continue interconnecting other PSUs in a chain, follow the
instructions above, but check that all the devices connected to all the
PSUs in the chain draw a total combined current that does not exceed
the safe maximum of 16 amps. To supply AC mains power to devices