Product detail
Sub-Main Distribution Boards for floor-level, zone, and riser power distribution — MCCB incomers with MCB/MCCB outgoing ways, energy metering, and surge protection for commercial buildings, hospitals, and industrial facilities.
Nairobi Power Engineers designs and manufactures the assembly around site duty, prospective fault level, installation access, service continuity, cable entry and maintainability. The supply can be configured with ABB, Schneider Electric or CHINT equipment according to duty, lead time and lifecycle support.
✓MCCB incomer sections rated 100A to 1600A with adjustable trip settings
✓MCB and MCCB outgoing ways for sub-circuit and final distribution
✓Energy metering compartments with CT-operated multifunction meters
✓Surge protection devices (SPD Type 1+2) for downstream equipment protection
✓Load schedule verification and phase balancing
✓Cable sizing and voltage drop calculations
✓Diversity factor application and demand analysis
✓IP rating selection for installation environment
OEM selection basis
SMDB layouts are documented with floor/riser load schedules, feeder coordination, metering points, spare-way allowances and cable-entry details.
Technical detail library
Sub-main rows only: MCCB incomers, MCB/MCCB outgoing ways, distribution blocks, metering, SPD and riser panels. Open the cards for ratings, source basis, build options and direct contact links.
Engineering Calculator
Enter parameters for real-time IEC/KPLC-standard sizing. Results update dynamically.
Sizing 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.
Our Sub-Main Distribution Boards (SMDB) solutions are custom-engineered and assembled locally at our Baricho Road workshop in Nairobi. A standard build includes high-quality modular enclosures, premium copper busbars (rated for local environmental conditions), type-tested circuit breakers or control elements from trusted global partners (ABB, Schneider Electric and CHINT), and comprehensive routine test certifications before delivery.
All assemblies comply with KEBS and EPRA regulations. You should confirm the required operational voltage (typically 415V three-phase or 240V single-phase in Kenya), rated current, prospective fault levels (e.g., 35kA or 50kA as per KPLC system requirements), form of separation (up to Form 4b), IP rating (IP31 indoor / IP54 for dust-heavy sites), and cable entry orientation (top or bottom entry).
NPE starts with the single-line diagram, load schedule and operating sequence, then selects the circuit protection path, device families, enclosure format, controls and testing requirements.
Send the single-line diagram, load schedule, incoming supply details, fault level if known, preferred OEM brand, cable entry direction, installation environment and delivery location.
Yes. NPE can quote ABB, Schneider Electric, CHINT or a mixed-OEM architecture according to rating, availability, monitoring requirement, lifecycle support and budget.
Yes. Metering, alarms, Modbus, Ethernet, BMS contacts, SCADA points and commissioning checks can be included where the selected product family supports them.
Product enquiry
Use the calculators for a first-pass engineering check, then send us the SLD and load schedule for a project-ready selection.
Electrical service you can count on
When sub-main distribution boards 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.
Sub-Main Distribution Board costs vary significantly depending on several key factors. Here is what you need to know to make informed decisions and avoid unexpected expenses.
The price of a Sub-Main Distribution Board package depends on the load schedule, fault level, enclosure form and IP rating, plus the OEM equipment you specify. Site conditions and delivery timelines also move the number.
Our engineers issue itemised quotations covering equipment, assembly, factory testing and delivery — no hidden fees. You know exactly what to expect before any work begins.
Scheduled inspection, thermographic surveys and torque checks catch small issues early, helping you avoid major repairs. Planned maintenance extends system life and protects uptime.
Whether it is a scheduled upgrade or an urgent call, our Nairobi workshop at Baricho Road responds quickly and gets the job done right — minimising downtime and keeping you safe.
If you are ever unsure or feel unsafe around an energised assembly, do not take chances — call a licensed engineer. Safety always comes first. Feel free to contact us or give us a call.
+254 0737-944-014