PRAESENSA General installation procedures and instructions | en 23
Bosch Security Systems B.V. Installation manual 2019.11 | V1.00 |
4.5.2 Cable type recommendations
Mains cable
– Use the supplied mains cable that came with the multifunction power supply or an
equivalent.
Loudspeaker cable
– When selecting cables and wire gauge take into account the length and loudspeaker load
to avoid excessive power loss. Make sure that the signal level at the end of the
loudspeaker line has not dropped with more than 2dB (this is approximately 20%), as
this will also affect proper operation of the end‑of‑line device.
The table shows the required wire size for copper wires, to keep the loss at the end of
the loudspeaker line below 2dB, when all the load is at the end of the cable. In practice
the load will be more distributed and then the attenuation will be less than 2dB. Round
up the actual load power and cable length to the next number in the table.
Copper clad aluminum (CCA) wires are cheaper but have a higher resistance than copper
for the same diameter. When using CCA cables, take the next bigger wire size from the
table. Examples:
– A 150W loudspeaker load on a loudspeaker line of 480m in a 100V system. Round
up to table values 200W and 500m. This requires 1.5mm
2
copper wires or 2.5mm
2
CCA wires.
– A 150W loudspeaker load on a 1200ft loudspeaker line in a 70V system. Round up
to table values 150W and 1312ft. This requires AWG14 copper wires or AWG12
CCA wires.
– When selecting cables and wire gauge take into account the maximum loudspeaker cable
capacitance specified for the amplifier.
– When end-of-line supervision is used, take into account the maximum loudspeaker cable
capacitance specified for the end‑of‑line device.
– For compliancy to UL62368‑1 all loudspeaker wiring must be Class2 (CL2); this
requirement does not apply for compliancy to EN/IEC62368‑1.
Conversion
mm
2
0.5 0.75 1 1.5 2.5 4 6 10 16
AWG 20 18 17 16 14 12 10 8 6
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