MAX Power VIP 150 Electric Retractable Thruster - Manual (Page 9)

VIP 150, 12/24V with Electronic Controller . 25/12/05
9
4.2 POWER CABLE SELECTION:
According to the ISO 10133 standards: “The length and cross sectional area of conductors in
each circuit shall be such that the calculated voltage drop shall not exceed 10% of the
nominal battery voltage at any appliance if the circuit is switched on at full load”.
The cable lengths as given in the table below are the total length of the positive cable,
measured from the thuster battery bank to the thruster, plus the total length of the negative
cable measured from the thruster back to the battery bank.
When choosing or calculating the cable size needed for your thruster installation, do not
forget to take into account the thermal rating of the conductor insulation which are directly
related to the ampacity (current carrying capacity) of the cable. Always try to use cables with
the highest thermal insulation rating available or at least 85° - 90°C.
For large diameter cables it may be easier to use two smaller cables instead (in order to allow
for a greater flexibility of movement). For example: 2 x 50 mm² instead of 95 mm². Cables at
thruster unit should be free to move, without kinking when VIP goes up and down.
4.3 POWER FUSE:
Sizing of fuses for overcurrent protection are a function of the cable sizes in the circuit, not
the amperage drawn by the appliance (thruster motor) in the circuit. It is thus not the
electrical thruster motor that is protected by the fuse, but the power cables supplying the
thruster motor.
Fuse
Fuse
Holder
VIP 150, 12V VIP 150, 24V
Max Power Fuse Size 315 A 200 A
Regular Fuse Rating 600 A 300 A
Max Power Part Number
for fuse.
OPTI 3121 OPTI 3112
Max Power Part Number
for fuse holder.
OPTI 3091 OPTI 3119
VIP 150, 12V VIP 150, 24V
Cable Lengths
From battery to thruster (+) & back (-)
mm² AWG mm² AWG
5 m (2 x 2.5m) 95 mm² 3/0 50 mm² 1
10 m (2 x 5.0m) 120 mm² 4/0 70 mm² 2/0
15 m (2 x 7.5m) 185 mm² 350MCM 95 mm² 3/0
20 m (2 x 10m) 240 mm² 500MCM 120 mm² 4/0
The Max Power fuse has been application selected for it’s
time and current characteristics, consequently a much
lower rated fuse than traditionally rated may be fitted. Max
Power recommends the following fuses and fuse holders as
supplied by Max Power: