Beta Marine Beta 10 Operator's Maintenance Manual page 27

2
70mm Cable
Engine Cranking Amps
Up to Beta 38
Up to Beta 50
Up to Beta 60
Up to Beta 105
Beta 150
*Voltage drops for pvc insulated cables are ex table 9D1
of the IEE Wiring Regulations.
The above are based on a maximum conductor
temperature of 70°C in an ambient temperature of 30°C.
At the end of the day what matters is that the voltage at the starter motor terminals
before starting and whilst cranking is correct and does not destroy the insulation on the
cables.
KEYSWITCH TERMINATIONS
The standard panel keyswitch can be used to tap off a
switched positive ignition feed to power additional gauges.
In this way these gauges will only be live whilst the
engine is running, the engine is starting or the heaters are
being used.
For silver keyswitches, the terminal to achieve this ignition
switched positive is marked 'AC'.
For panels without any keyswitch, gauges can be driven
from the 1 mm2 brown wire which terminates at 11 way
connector terminal 4. This is a lower power switched
positive, any additional power required from this
connection must be feed through a relay, as noted below.
Cable Volt drop*
100
120
170
210 / 250
333
Max length, both cables added together
0.00063V
0.00063V
0.00063V
0.00063V
0.00063V
Note: that it is not practical to use table 9D1 of the IEE
Wiring Regulations for larger sizes. We are after all talking
about short duration power flow not continuous ratings for
the starter motor.
Note: these keyswitch terminals are rated at 10 amps
maximum, since they are already utilised for panel and
alternator feeds Beta Marine recommend any additional
requirements from these terminals must be fed through a
relay. This relay should then be connected to it's own
fused positive supply directly from the engine battery.
Beta drawing 202-06421 illustrating the wiring of a
typical electric fuel lift pump with ignition switched relay
can be supplied upon request.
25
12.7m
10.5m
7.5m
5.0m
3.8m