Moisture-Proof Wiring Tips for ZCEBOX Plastic Distribution Box Junction Boxes in Metro Tunnel Sections

1. 1.Dual Reinforcement Design for Moisture and Water Resistance

• Model Adaptation: Prioritize ZCEBOX metro-specific moisture-proof models (protection grade IP68, supporting 24-hour immersion in 1m deep water without leakage), with box body made of moisture-resistant and flame-retardant ABS + glass fiber material (flame retardant grade UL94 V-0, no halogen emission), temperature resistance range -25℃~85℃, adapting to extreme temperature and humidity in tunnels;

• Sealing Protection: Adopt "labyrinth seal + fluororubber double sealing ring" structure for box joints; install metro-specific waterproof cable glands (IP68 grade, suitable for 1.5-6mm² cables) at wiring holes; apply moisture-resistant sealant on threads after tightening; design diversion grooves + drainage holes (with silicone waterproof plugs, sealed normally, quick drainage when water accumulates) at the bottom of the box to avoid condensed water accumulation;

• Insulation Upgrade: Use metro-specific moisture-resistant and flame-retardant cables (insulation layer with XLPE + polyolefin double-layer structure, moisture resistance grade ≥4); power wires (fan, lighting power supply) have a diameter ≥2.5mm²; signal wires (smoke detectors, temperature sensors) adopt double-shielded moisture-resistant cables, with shielding layer grounding resistance ≤1Ω to prevent signal attenuation caused by moisture.

2. 2.Vibration Resistance, Dust Prevention + Compliance Optimization

• Vibration-Resistant Fixation: Fix the box through ZCEBOX metro-specific vibration-proof mounting bases (with built-in natural rubber buffer pads, thickness 12mm, buffer frequency 10-500Hz), reserve a 6mm buffer gap with the tunnel wall to absorb train operation vibration; tighten terminals to 1.5-2.0N·m torque and install dual locking of anti-loose washers + cotter pins; fix wires with metro-specific vibration-proof cable ties (tensile strength ≥180N) every 30cm, with bending radius ≥12 times the wire diameter;

• Dust Prevention and Maintenance: The box adopts a fully sealed structure, with a hidden purge port (adapting to φ6mm air pipe) reserved; purge internal dust with dry compressed air (pressure ≤0.3MPa) every quarter; select corrosion-resistant nickel-plated terminals (contact resistance ≤6mΩ) to resist corrosive gas erosion in tunnels;

• Compliance Enhancement: The box passes smoke and toxicity level testing (complying with GB/T 18244) with no toxic gas emission; physically separate strong electricity (380V power supply) and weak electricity (12V signals) with metal partition plates (spacing ≥8cm), meeting metro EMC requirements (EN 50121-3-2) to avoid interfering with train control systems.

E-mail: sales@zcebox.com