LV Power Cables
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Cable sized correctly for the circuit
Nairobi Power Engineers supplies LV power, control, armoured and flexible cables, sized to IEC for the design current, the installation conditions and the acceptable voltage drop.
The correct conductor size depends on more than the current: the ambient temperature, the installation method and any harmonics reduce the cable’s capacity, so the conductor must be sized on its installed condition — not just the breaker rating.
Use the calculator on this page to see the recommended copper cable size for a load, with ambient and installation derating applied the right way round.
24/7 Emergency Support
Electrical service you can count on
When cable equipment fails, you need fast, reliable help from experienced engineers. We offer around-the-clock emergency support across Nairobi and East Africa — keeping your plant safe and powered, day or night. Whether it is an urgent breakdown or a scheduled repair, our team is ready to respond whenever you need us.
Cost and Estimates
What drives the cost
What affects the cost?
Conductor size and material (copper or aluminium), armour and insulation type, and the run length. Derating for ambient, grouping and installation method changes the size needed.
Get a detailed estimate
We quote the cable to the circuit — size, type and length — with the sizing calculation behind it.
Sized on installed condition
Ambient temperature, installation method and harmonics reduce the cable’s capacity, so the conductor is sized above the current accordingly.
Voltage drop checked
On long runs the voltage drop is checked and the conductor upsized where needed, not just the current capacity.
Product Family
Select the range for the job
Engineering Calculator
Instant Technical Sizing
Enter parameters for real-time IEC/KPLC-standard sizing. Results update dynamically.
Results
Design Current
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Recommended Breaker
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Recommended Type
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Copper Cable Size
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* For reference only. NPE engineering verifies configurations prior to build.
Frequently asked questions
How is cable size chosen?
From the design current, then increased so the cable’s derated capacity still carries it, and checked for voltage drop on long runs. The calculator on this page shows the size.
Copper or aluminium?
Copper for most LV circuits and smaller sizes; aluminium can be economical on large feeders where the size increase is acceptable.
Does derating change the cable or the breaker?
The cable. Derating reduces the cable’s capacity so the conductor grows; the breaker is sized on the load, not the derating.
When do I need armoured cable?
For buried runs and where mechanical protection is needed; SWA armoured cable is the usual choice.
When in doubt, put safety first
If you are ever unsure or feel unsafe, do not take chances — call a licensed engineer. Safety always comes first. Contact us for verification, specification and installation support.
+254 0737-944-014Speak to our experts