Pramac P Series, Operator'S Manual

Page: 23 / 48

7 Operation
23
7.7 Use of extension cables
A loss of power takes place when connecting electrical equipment or a tool to the
generator with an extension cable
— the longer the cable, the greater the loss of
power. This means that less voltage is conveyed to the electrical equipment and
the input current is increased or the performance is reduced. A larger extension
cable diameter reduces the loss of voltage.
NOTE : Operation of electrical equipment under low voltage may lead to
overheating.
The table serves as a guideline for selecting the correct cable size.
Only tough, rubber-sheated flexible cables in accordance to regulation IEC 60245-
4 or equivalent can be used.
WARNING
Damaged cables may cause electric shock, which can lead to serious injury or
death. NEVER use worn, bare or frayed cables. Replace damaged cables
immediately.
Never exceed the cable's rated power.
Contact the cable manufacturer if you have questions about using the cable.
Select the cable size from the table Minimum cross-section of extension cables or
calculate the minimum cross-section using the graph Minimum cross-section of
extension cables . The X-axis of the graph stands for the values A x m (ampere x
meter). The Y-axis stands for the cross-section in mm². Multiply the steady state
(operating) current for the load in ampere (A) with the desired length of the
extension cable in meters (m). Now look for your result on the X-axis. Go along the
graph until you have found the point for your field of application. Now read the
recommended minimum cable length on the Y-axis.
Example
For example, if there is a triple-phase application with 400 V of steady state
(operating) current available for the load at 15 A and the desired extension cable
length is 100 m, then:
15 A x 100 m = 1500 A x m.
1500 A x m = 2.5 mm².