IEC 61439 Type-Tested Panel Manufacturer in Vadodara, India

IEC 61439 is the standard that low-voltage switchgear and controlgear assemblies are built and verified to. It replaced IEC 60439, and with it the old labels TTA and PTTA. Under the current standard there are two distinct things, and the difference is the single most misunderstood point in LT panel procurement: design verification, which proves a system's construction by test, calculation or comparison, and routine verification, which is done on every assembly before it leaves the works.

Wisdom Techno Solutions builds to IEC 61439-1 and -2 at our works in Vadodara, Gujarat, inside licensed systems whose design verification is held by the system owner — Rittal, C&S and Siemens. We build within each system's verified configuration and routine-verify every assembly ourselves.

• Built inside design-verified licensed systems — Rittal Ri4Power, C&S CX, Siemens SIEPAN
• IEC 61439-1 and IEC 61439-2 / IS-IEC 61439 Part 1 and Part 2
• Busbar systems to 6300 A, copper or aluminium, Form 1 to Form 4B separation
• Routine verification on every assembly, in-house, before dispatch
• Customer, consultant and third-party witnessed FAT supported
• Dispatch documentation: FAT report, IR and dielectric results, approved GA and SLD, BOM with makes as supplied

Whether the assembly is a PCC, an MCC, a PMCC or a distribution board, the specifications below cover our standard build.

The table below covers the standard build. Every assembly is engineered against the project single line diagram, load list and fault level, so the applicable ratings are confirmed against your specification before manufacturing begins.

This is the table to read before writing an IEC 61439 clause into a tender. The two verifications answer different questions, are done by different parties, and produce different documents. Asking a manufacturer for the wrong one is the most common reason an IEC 61439 clause cannot be satisfied.

“Type-tested” is a term from the superseded IEC 60439. It is still in everyday use, and most enquiries that say type-tested mean design-verified. Under IEC 61439 the correct request is for evidence that the assembly is built within a design-verified system configuration, plus the routine verification records for your particular board.

The practical consequence is worth stating honestly. A manufacturer who builds inside a licensed system inherits that system's design verification only for configurations the licence actually covers — the busbar arrangement, the device makes, the compartment layout. Depart from the verified configuration and the verification no longer applies to what was built. Design verification covers the configuration it was established for, and when it is not that configuration it does not carry over. That is why the enquiry should name the standard with its part and year, and why we confirm the applicable ratings against your specification before manufacturing begins rather than after.

It is also why a FAT report, however thorough, is not a substitute for design verification. A FAT proves that this board works. Design verification proves that this construction withstands a fault. Two different questions, two different documents — and a tender that asks for one while meaning the other will get an answer nobody is happy with.

Send these and every offer you receive will be comparable:

• Single line diagram
• Load list with connected and demand loads
• Transformer rating and impedance
• System fault level
• Required form of separation and IP rating
• Indoor or outdoor installation, single front or double front
• Busbar material, enclosure material and paint shade
• Metering and communication requirements
• Spare feeder and future expansion provision
• Applicable standard, with part and year

Where the load list is not ready we can build an offer from the transformer rating and an outline feeder schedule, and refine it once the list exists.

• Writing "as per IEC 61439" with no part and no year. Part 1 is the general rules and Part 2 covers power switchgear assemblies. The verification evidence a manufacturer submits has to be traceable to a specific standard and configuration.
• Asking the panel builder for a design verification certificate in its own name. Under the standard that belongs to the system owner. What the panel builder can supply is evidence of building within a verified system, plus routine verification for your board.
• Treating a FAT report as design verification. A FAT proves this assembly functions. It says nothing about whether the construction withstands a short circuit.
• Accepting a verified rating without the configuration it belongs to. A rating is verified for a specific busbar arrangement and device set, not for the manufacturer in general.
• Omitting the fault level from the enquiry. Without it no vendor can size the assembly correctly, and the offers stop being comparable.
• Writing "as per IEC 61439" with no part and no year. The verification evidence a manufacturer submits has to be traceable to a specific standard and configuration.

Wisdom Techno Solutions is a licensed partner for three design-verified switchgear platforms: Rittal Ri4Power (Rittal Solutions Partner since 2021 — the Ri4Power system carries Intertek ASTA design verification to IEC 61439-1 and -2 Edition 3, with copper and aluminium busbar systems up to 6300 A), C&S CX (Licensed Partner since 2023, up to Form 4B Type II) and Siemens SIEPAN Elite/8PU (IEC 61439 Solutions Partner since 2024). We build to each system's verified configuration and routine-verify every assembly in-house at our Vadodara, Gujarat facility, for industrial, EPC and infrastructure projects across India.

Under IEC 61439 the design verification belongs to the system owner and the routine verification to the assembly manufacturer. We hold the manufacturing licence, we build inside the licensed system's verified configuration, and every assembly is routine-verified before dispatch. The dispatch documentation includes the FAT report, insulation resistance and dielectric withstand results as applicable, approved GA and SLD drawings, bill of materials with makes as supplied, protection settings as applied, and the punch-point list with documented closure. Customer, consultant and third-party witnessed FAT are all supported.

Engineering guides from our team on the calculations and design decisions behind an IEC 61439 panel:

• IEC 61439 design verification vs routine verification, explained for buyers
• Top 5 reasons IEC 61439 type-tested panels are worth the investment
• Icu vs Ics vs Icw — selecting the correct short-circuit rating
• Form 1 to Form 4B — which panel separation you actually need
• Internal arc fault in LT panels and IEC TR 61641 testing
• Electrical panel FAT and routine test checklist
• How to calculate busbar size for LT panels
• How to prepare an LT panel technical specification and RFQ

If this is not the right fit for your layout, these are the alternatives we build to the same standard:

• PCC panels — power distribution from the transformer incomer to the plant's outgoing feeders
• MCC panels — centralised motor control and protection, sized to the motor schedule
• PMCC panels — PCC distribution and MCC motor control combined in one assembly
• IMCC panels — intelligent motor control with communication-enabled motor protection relays
• IPCC panels — intelligent power control with metering and protection on a communication bus
• HT / MV panels — 11 kV VCB switchgear on the incoming side of the transformer

Email your single line diagram, load list and system fault level and our engineers will come back with a technical offer. Not sure what to send? See what a panel manufacturer needs in order to quote accurately.