求翻译：本工程所有消防设备的供电和控制线路均采用非延燃材料作绝缘或护套的导线，等级为阻燃B级耐火型（ZBN），采用暗管配线，并采取防火措施(如穿钢管并在墙体内敷设，且保护层的厚度不小于3cm)。是什么意思？

Power supply and control lines of all fire-fighting equipment of the project are non-retardant materials for insulation or sheath of the wire, grade flame retardant b grade refractory type (zbn), underground pipe wiring, and fire protection measures (such as wearing The steel pipe laid in the wall,

This works all the fire power to the device and control lines are used for non-fuel materials as insulation or jacket, at the level of the wires as a flame retardant B class fire (ZBN), a closed wire, and to take fire prevention measures, such as through tubes and laid on the wall, and the protectio

This project all fire fighting equipment power supply and the control line use must extend burn the material to make the insulation or the protective covering wire, the rank for are flame-resistant B level fireproof (ZBN), uses the underground pipe to match the line, and takes the fire precautions (

All fire-fighting equipment of the project extension of power supply and control lines are made of non-combustible materials for insulation or sheath, wires, flame retardant b-class grade (ZBN), using dark tube wiring, and fire prevention measures (such as wearing laying pipe and inside the walls, a