Five working tools for the decisions that come before a drawing is released: current capacity, voltage drop, layer count, weight and cost. Every result shows the formula, so you can check it against your own sheet.
Tools are how a specification gets started. An engineer who can put a number on voltage drop in ten seconds will specify a cross-section before the first email, and the quotation that follows is already anchored to the right geometry.
Each tool below is a standalone page with its own formula, assumptions and limits. They share one rule: the result is a design starting point, never a released specification — the final number is fixed by the drawing, the test record and the installation conditions.
Current capacity from cross-section, material, ambient and mounting — with derating factors shown separately.
Open the ampacity calculatorResistance, voltage drop, percentage drop and power loss for copper or aluminum bars at DC, single-phase or three-phase.
Open the voltage drop calculatorHow many conductor layers a given current and inductance target actually needs.
Read the layer-count methodCopper weight per metre, scrap allowance and cost build-up for a laminated stack.
Read the weight and cost methodStart from the load, the envelope and the temperature rise and work back to a cross-section.
Read the sizing workflowThe ampacity and voltage-drop tools are live calculators. Layer count and weight/cost open the engineering note that carries the same formula.
Send the current profile, voltage class and installation conditions — we will size the busbar and document the calculation.
