BCU 370 · Edition 01.19 66
Project planning information
6 Project planning information
6.1 Cable selection
Use mains cable suitable for the type of operation and
complying with local regulations.
Signal and control line: max. 1.5 mm
2
.
Control line for UVC 1 wiring: 1 mm
2
.
Cable for burner ground: 4 mm
2
.
Do not route BCU cables in the same cable duct as
frequency converter cables or cables emitting strong
fields.
6.1.1 Ionization cable
Use an unscreened high voltage cable for the ignition
cable, see page 71 (Accessories).
Recommended cable length: max. 50 m (164 ft).
Lay cables individually, not in a metal conduit.
Install well away from mains cables and interference
from electro-magnetic sources.
Do not lay together with ignition cable.
6.1.2 UV cable
Cable length: max. 50 m (164 ft).
Install well away from mains cables and interference
from electro-magnetic sources.
Do not lay together with ignition cable.
6.1.3 Ignition cable
(BCU 370..I1, BCU 370..I2 with integrated electronic
ignition unit)
Use an unscreened high voltage cable, see page 71
(Accessories).
Cable length: max. 1 m (3.2 ft).
Avoid external electrical interference.
Permanently connect the ignition cable(s) to the inte-
grated ignition unit using plug connectors, see page
71 (Accessories).
Lay cables individually, not in a metal conduit.
Do not lay UV/ionization cable and ignition cable(s) to-
gether and lay them as far apart as possible.
Feed out of the BCU on the shortest possible route (no
loops). Push through corresponding knock-out hole(s)
in the housing and use enclosed M16 cable gland(s).
Only use radio interference suppressed terminal boots
(with 1 kΩ resistor), see page 71 (Accessories).
For units with external ignition, e.g. ignition transformer
TGI, please note the corresponding unit instructions.
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