Page 76 - Reference framework for integrated management of an SSC - A U4SSC deliverable on city platforms

The power supply for IoT devices should, as far as possible, be designed to minimize running costs
of maintenance battery replacement and to support low-carbon environmental solutions.

• In general, devices that require a continuous power supply will use the energy of the specific
holder itself, if available. To provide protection and to be able to operate on each individual
IoT device, a high-sensitivity differential circuit breaker or a fuse will be installed in order to, in
case of breakdown or maintenance of the device, operate on it without affecting the rest of the
system.

• Devices that require a continuous power supply and whose holder does not have power will
be connected to the nearest command centre using the existing ducts of the public lighting
network or the mobility department, as shown in Figure 19. The choice of infrastructure will
depend on the relative location of the IoT devices with respect to the frames and the costs of civil
works. To ensure security and non-interference with existing services, the power supply system
for IoT devices will be protected by a differential circuit breaker or a fuse on the dashboard to
protect the set of IoT devices that are installed. This power line should be independent and
should not be shared with any other service. The characteristics of the cable, section, cover,
etc., will depend on the applicable regulations in each country.

• To protect and be able to operate on each individual IoT device, it is recommended to install
a high-sensitivity differential thermal magnet switch or a fuse with sufficient characteristics in
each of the poles or connections where the IoT device is installed. In case of breakdown or
maintenance of the device, it must be possible to operate on it without affecting the rest of the
system.

• In the specific case of public lighting, there are some particularities to consider. In standard
installations, the lighting poles have energy only the moment the streetlight line is activated.
Using a battery of sufficient capacity, the IoT device could remain active during periods when
the line does not have power.

Figure 19: Power Supply for IoT devices with wireless connectivity

62 Reference framework for integrated management of an SSC | June 2023