A neutral bar is a conductive metal rail designed for centralized termination of neutral conductors (N-line) in low-voltage distribution systems. As a critical component in distribution panels, switchgear, and control cabinets, it enables neutral line consolidation, branch distribution, and grounding protection—particularly essential in TN-S, TN-C-S, and TT earthing systems.
1. Core Functions
Collects N-conductors from multiple circuits (e.g., lighting, sockets) into a single node.
In TN-C-S systems, links to the main earth bar (PE bar) for combined PEN functionality.
Provides a low-impedance return path for unbalanced currents (critical for RCD/GFCI operation).
2. Key Applications
TN-S/TT Systems: Central hub for all circuit neutrals (e.g., 63A~400A rated).
Earth Bonding: Interfaces with PE bar via copper jumpers (≥10mm² cross-section).
Residential Panels: Distributes neutrals for lighting/socket circuits (e.g., DIN rail-mounted bars).
Riser Busways: Neutral connection point for vertical bus ducts in high-rises.
PLC/Drive Cabinets: Centralized neutral management (isolated bars with IP20 protection).
Harmonic Mitigation: Double-layer bars for separating linear/non-linear load neutrals.
PV Inverters: AC-side neutral busbar (often integrated with surge protection).
BESS: Neutral reference point in battery storage systems.