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
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 k
Ω
resistor), see page 71 (Accessories).
For units with external ignition, e.g. ignition transformer
TGI, please note the corresponding unit instructions.