Two Approval Tracks, One Product

A Shabbat-compatible product runs two approval tracks in parallel. The familiar one — electrical safety, electromagnetic compatibility, and any water or food-contact standards — is outlined in product safety testing requirements. The second track is halachic, and it runs through a halachic-technological certification body.

In the United States the best-known name in this space is Star-K, which certifies Sabbath Mode behavior on appliances from major manufacturers. In Israel the Zomet Institute has the longest track record in Shabbat-specific engineering, alongside bodies such as the Institute for Science and Halacha, and it works with manufacturers internationally. In practice the two tracks are more alike than founders expect: both have written requirements, a design review, hands-on testing, and a certificate. Anyone who has worked through a regulatory process will feel at home.

This article is educational engineering background only. Projects House is an engineering firm, not a certification body, a rabbinic authority, or a regulatory consultancy. Halachic determinations belong to a qualified rabbinic authority, and current requirements must be confirmed directly with the certifying organization.

What the Certifier Actually Examines

Design review

The organization receives the architecture: electrical schematics, water-flow or mechanical-motion diagrams, and a written description of software behavior in every operating state. The review descends into details an ordinary engineer would never think to raise — what happens to a circuit when a mechanical handle is pulled, whether any sensor "sees" the user's action, and which currents change as a result of it.

Software review

In any product with a controller, Shabbat mode must be defined and unambiguous: which tasks run, which are disabled, and what guarantees the mode cannot change by accident. Critically, the firmware version that was tested is the version that is approved — a point that will occupy you again during series production, and one that makes a disciplined update pipeline essential. See OTA firmware updates for how to build an update channel that does not invalidate your approval.

Physical testing

Representatives operate the product, measure currents and temperatures, and verify that every Shabbat usage path is genuinely clean — including edge cases such as a power outage and its restoration, a partially completed cycle, and simultaneous user actions.

Certificate and conditions

Approval is granted to a product in a specific configuration, sometimes with conditions attached: an instruction label, a sealed or locked Shabbat mode, or a mandatory permanent indicator. Any design change requires updating the certifier. Approval is not a one-time transaction but an ongoing relationship, which means version control and engineering documentation have to be built for continuous re-approval from the start.

Where It Fits in the Schedule

The common mistake is arriving at the certifier with a finished product. The correct process is interleaved:

  • Define halachic requirements during the requirements phase, alongside the functional specification.
  • Hold an interim architecture review before the design freezes — this is where the expensive mistakes get caught cheaply.
  • Book final testing against an advanced prototype rather than a production unit.

Handled that way, halachic guidance starts with system-level diagrams, continues through prototypes, and the final review confirms a product designed correctly from the ground up — with no wasted correction cycles. Handled the other way, a firmware architecture that assumed sensor-driven behavior may have to be rebuilt, which is the single most expensive rework in this category.

What the Certifier Will Look For in Your Architecture

Three patterns account for most findings.

  • Sensors acting as triggers. A thermostat, door switch, or occupancy sensor that causes an action in response to the user. The fix is usually to move to a pre-set schedule with sampling at fixed instants — the approach described in Sabbath mode on appliances.
  • Feedback that responds to the user. Beeps, changing displays, and status LEDs that react to a press. In Shabbat mode these are suppressed rather than merely dimmed.
  • Inputs that stay live. Infrared, Bluetooth, and Wi-Fi receivers that still accept commands while the product is nominally locked. The lock must be enforced in firmware.

Where a permitted user-initiated outcome is genuinely required, the design leans on delayed and indirect action, covered in grama mechanisms. Scheduling architecture, which nearly every such product depends on, is covered in Shabbat timers and time controllers.

Certification and the US Market

For a US-market appliance or fixture, halachic certification is a commercial gate rather than a legal one — nothing in federal or state law requires it, but community retailers, institutional buyers, and observant consumers rely on it. That has two practical consequences. First, budget the certification effort as a marketing-critical path item with a real lead time, not a formality. Second, coordinate it with your safety and radio approvals so the two tracks finish near each other; a product that clears one and stalls on the other still cannot ship.

The Most Important Advice

Treat the halachic body exactly as you would a standards authority: a professional organization with consistent requirements, worth engaging early, with every agreement documented in writing. A team that manages both tracks properly finishes them almost in parallel and reaches the market with a product nobody stops at the door. More engineering guidance for this market is collected on the kosher product development hub, and building-scale applications in synagogue automation.

Plan Approval Into Your Development

Projects House designs Shabbat-compatible products with the halachic review folded into the schedule from the requirements stage — architecture, electronics, firmware, prototypes, and the documentation the certifier will ask for. Describe your product through our contact form and we will map the two approval tracks with you.