LT panel contractor and consultant —PCC, MCC and APFC panels built to IEC 61439

Scope

Scope of work

Panels are designed from the single-line diagram — incomer and outgoing ratings, fault level, the form of internal separation the client's safety standard calls for, metering and protection relays, and the interlocks between incomers and bus couplers. Motor control centres carry the starters, drives and control logic the process needs; APFC panels are sized from the measured or calculated reactive demand, with detuned reactors where harmonics warrant them. We prepare the panel specification and drawings, require assembly verification to the applicable IEC 61439 part, and install the panels and terminate the cabling. Approved component makes do not replace verification of the assembly.

How it is delivered — and what you receive

Panels are inspected at the factory before dispatch and tested on site — insulation resistance, functional checks of every breaker, relay and interlock, and secondary injection of the protection relays. The APFC panel is commissioned against a live power-factor reading so the steps actually correct the load present. The client receives the general-arrangement drawings, the schematic, the relay settings and the test reports, which is also the record the CEIG inspection looks at.

Sources and standards

• IS 732 (2019) — IS 732 — Code of Practice for Electrical Wiring Installations. Bureau of Indian Standards. Publisher. Low-voltage wiring installations — cable selection, protection, installation methods.
• IS 3043 (2018) — IS 3043 — Code of Practice for Earthing. Bureau of Indian Standards. Publisher. Earthing system design, electrodes, resistance values and testing.
• IEC 61439 — IEC 61439 — Low-voltage switchgear and controlgear assemblies. International Electrotechnical Commission. Publisher. Design verification and type-testing of LT panels — PCC, MCC, distribution boards.
• CEA (Measures relating to Safety and Electric Supply) Regulations (2023 (superseding the 2010 regulations)) — Central Electricity Authority (Measures relating to Safety and Electric Supply) Regulations. Central Electricity Authority. Publisher. Safety requirements for electrical installations, inspection of HT installations before energisation, periodic inspection, earthing and protection.
• NBC 2016 Part 8 (2016) — National Building Code of India 2016, Part 8 — Building Services. Bureau of Indian Standards. Publisher. Lighting, ventilation, air-conditioning, electrical installations, lifts and escalators — the building-services framework.

Standards are cited to support the technical statements on this page. Where a standard has been revised, the edition shown is the one verified at the time of review; the edition in force for a project is the one the authority applies.

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