I. Material Inspection Upon Arrival: 1. Verify tray specifications, thickness, and material match contract and design requirements; 2. Check surface coating for no large-area peeling, smooth welds without burrs or deformation; 3. Ensure complete supporting certificates, type test reports, and fireproof testing documentation; 4. Confirm brackets and connectors match specifications, and galvanized parts show no severe peeling or rust.
II. On-Site Installation Completion Inspection: Verify proper installation alignment, secure fastening, correct spacing, and compliance with design drawings. Ensure grounding connections are intact and cable routing follows planned pathways without sharp edges that could damage cable insulation.
I. Chemical Workshop Corrosion Environment Classification: 1. Mild corrosion: small amounts of acid-alkali vapor, slight moisture; 2. Moderate corrosion: regular chemical production with intermittent acid-alkali mist; 3. Severe corrosion: electroplating and pickling workshops, high-concentration acid-alkali liquid splash areas.
II. Scenario-Specific Selection: 1. Mild corrosion: hot-dip galvanized steel trays; 2. Moderate corrosion: 304 stainless steel trays; 3. Severe corrosion: 316 stainless steel or polymer (FRP) trays. Proper material selection ensures long-term reliability and reduces maintenance costs.
I. Utility Tunnel Wiring Environment Characteristics: Confined spaces, high humidity, dense pipeline arrangements (water supply, drainage, gas, power in same compartment), long wiring distances, and limited maintenance access.
II. Tray Selection Recommendations: 1. Standard power compartments: hot-dip galvanized tray and ladder types installed in layers; 2. Fire emergency compartments: fireproof-coated trough trays; 3. High-humidity areas: 304 stainless steel or hot-dip galvanized with additional corrosion protection.
I. Basement Environment Characteristics: Year-round high humidity, poor ventilation, prone to condensation and water accumulation. Fire protection circuits are classified as first-level priority loads, requiring both fire-resistant and moisture-proof cable tray solutions.
II. Selection Solution: Fire-specific fireproof-coated trough cable trays as primary solution; standard power circuits can be paired with hot-dip galvanized tray types. Areas with severe underground water accumulation should fully adopt hot-dip galvanized processing.
