Circuit calculator
A self-assessment tool for Israel's national electricity company, turning a manual, expert-only decision into an accessible tool professionals can evaluate in minutes.
The electricity Revolution
The decision behind every building
In 2025 Israel’s electricity market deregulated. IEC, the historically monopolistic national distributor, needed to modernise fast. One bottleneck stood out: every new connection request was a manual consultation with an in-house expert, just to answer one single question: Does this building require a transformer room?
How we got the brief
IEC handed over a brief spanning three kinds of constraints:
- Commercial scope according to electric connection process.
- Technical limits of IEC’s infrastructures & services.
- Legal regulation governing transformer room requirements.
Competitive & precedent research
Looked at how other utilities and regulated calculators handle a similar decision - where they simplify, and where they hide complexity a professional actually needs.
Interviews with electricians & engineers
The people who currently make this call by hand. Their mental model - how they read a load, what they check first, what they'd never trust a tool to skip - set the boundaries for the flow.
Flow & journey mapping
Mapped the manual consultation process end to end, then mapped every scenario the calculator would need to cover, from a single residential connection to a layered mixed-use case.
Does this building require
a transformer room?
The answer is regulated - It depends on building category, connection size, and total kVA load - and it determines whether a developer needs to allocate tens of square meters of internal space, route specialist infrastructure, and add months to the project timeline.
Get it wrong and a building is rejected on submission. Get it right and you save the developer a six-figure surprise. Multiply by the rate at which Israel builds, and a single static decision becomes a national throughput problem.
Design System
The IEC 2026 design system was extended alongside the product. Every token added here earned its place by carrying a real component in the calculator - orange because the stepper needed a color that wasn't red; indigo-50 because the sticky surface needed a calm neutral that wasn't grey - and the resulting set fed back into IEC's website-wide system.
Google Sans
