Panel and MCC wiring
IS 8130:2013 Class 5 flexible wire and screened control cable for LT panels, MCCs, and switchgear manufacturing. Supply to L&T, Honeywell, and GEC Alstom-class builds.
Governing standards
Domestic supply
| Application | Cable | Specification | Note |
|---|---|---|---|
| Main busbar tap-offs | Single Core Flexible WireIS 694:2010 | Class 5, 10–240 mm² | Class 5 for tight busbar chamber routing |
| PLC / relay logic — control wiring | Control CableIS 694:2010 | Unscreened, 0.5–2.5 mm², 2–24 cores | High core density for wireway routing |
| VFD & inverter control feeds | Screened Control CableIS 694:2010 | Al foil + tinned drain wire | EMI shielding for analogue and sensor loops |
| Inter-panel bridges & tray runs | Multicore Flexible CableIS 694:2010 | PVC insulated & sheathed, 2–4 core | Rugged jacket between MCC sections |
| Auxiliary circuits — panel lighting, fans | FR Single Core WireIS 694:2010 | FR grade | Low-smoke option: FR-LSH single core on request |
YY Control Cable (VDE 0250 / IEC 60227-7) for unscreened control multicore on European and GCC schedules. H07V-K (IEC 60227-3) for Class 5 single-core panel wiring to international harmonised specifications.
View export & international standards →Reference clients
Related sectors
Panel & switchgear wiring — common questions.
Engineering questions raised by panel builders, OEM machine integrators, and FAT QA teams.
Why must Class 5 flexible conductor be used in panels — why not Class 2 stranded?
Class 5 per IS 8130:2013 / IEC 60228 uses many fine strands so the bundle flexes elastically. Each strand distributes bending stress without work-hardening. Class 2 (stranded for fixed installation) has thicker strands that cannot bend elastically.
Inside a panel, every conductor is bent multiple times during installation, commissioning, and maintenance reconfiguration. Class 2 strands progressively work-harden until they fracture at termination points — the failure presents as intermittent contact or terminal overheating, not as an obvious broken wire. Class 5 is the engineering requirement, not preference.
When must screened control cable be used for VFD / PLC analogue I/O?
Specify screened multicore control (aluminium foil + tinned drain wire) for any analogue or low-level signal circuit running near VFDs, inverters, or high-current feeders. The drain wire enables single-point screen earthing per the EMC plan, draining EMI to ground rather than coupling it into the signal.
Unscreened Class 5 multicore is acceptable for digital I/O on isolated tray runs. PLC analogue (4–20 mA, 0–10 V), RTD, thermocouple, and Modbus signal wiring on noisy electrical systems should always be screened — the cost differential is trivial compared to commissioning rework when measurement noise is discovered late.
What conductor cross-section range does National Cables stock for panel-grade Class 5?
0.5 to 240 mm² across the full Class 5 flexible range, with stocked sizes covering:
- 0.5 – 2.5 mm² — PLC, relay, and contactor coil control
- 4 – 25 mm² — Branch feeders and small motor circuits
- 35 – 95 mm² — Main busbar tap-offs and outgoing feeders
- 120 – 240 mm² — Inter-panel bridges and main incomer cables
FR or FR-LSH grade per IS 694:2010 — match the grade to the enclosure fire strategy.
What standards documentation does National Cables provide for FAT (Factory Acceptance Test)?
For FAT documentation, the standards mapping is:
- Conductor class — verify against IS 8130:2013 / IEC 60228 tables for resistance and strand construction
- Insulation — verify against IS 694:2010 for thickness, dielectric strength, and mechanical properties
- Current ratings — apply IS 3961 (Part 2):2017 de-rating tables for the actual installation method and grouping
National Cables issues batch traceability, lot test certificates, BIS licence reference (CM/L-8800140116), and compliance letters for FAT binder submission.
Which export-standard cables suit international panel projects?
For international panel and OEM machine wiring, the harmonised equivalents to domestic IS 694:2010 Class 5 are:
- H07V-K (IEC 60227-3) — single-core panel wire, 450/750 V
- YY Control Cable (EN 50525-2-11 / VDE 0250-405) — unscreened multicore for European and GCC panel schedules
- H05VV-F / H07VV-F (IEC 60227-5) — flexible cords for portable equipment connections
All produced on the BIS-certified line — enabling seamless cross-border panel and OEM machine specification.
Specify National Cables for your panel build.
IS 8130:2013 conductor evidence, BIS compliance packs, and project pricing — 24-hour response.