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TSC-0912 - 09.10.12
Protect incoming and outgoing
electrical services
We’ll start by considering the main (office) building
in isolation.
Incoming mains power supplies
Install protection on the incoming
mains power supply at the incoming
distribution board(s).
If, as in this example, there are any
other power supplies entering the
building install protection on these
near where they enter the building.
Outgoing mains power supplies
Outgoing supplies can provide
transient overvoltages with a route
back into the building’s power
distribution system.
Install protection on supplies to other
buildings. (Note how, if correctly
positioned, the protector at the
incoming distribution board (1), also
protects against transients from the
outgoing supply to the UPS building).
Install protection on outgoing supplies
to site services, such as CCTV systems
and site lighting.
Protect all incoming/outgoing data communication,
signal and telephone lines (unless fibre optic).
Telephone lines
Incoming telephone lines and
extensions that leave the building
have protectors installed on them at
the PBX’s distribution frame.
In our example, there is a direct (i.e.
not via the PBX) telephone line to an
alarm panel, which also needs
protecting.
We’ve described in the ESP introduction how protection should be installed on all cables which enter or leave the
building (except fibre optic), the power supply local to important equipment and electronic equipment outside the
main building(s). With the aid of the illustration we can see how this might be applied in practice.
Data & signal lines
Protectors are installed on CCTV video
cables from outdoor cameras to
prevent damage to the control desk.
A protector is installed at the network
hub to protect it from transients on
the between building data link.
Equipment such as our RF receiver,
with antenna (or satellite) links will
also need protecting.