GB 50217-2018 第7.0.5条
| **** | The selection of flame-retardant cables shall comply with the following provisions:<br>1. For cables laid in bundles, selection shall be based on the volume of non-metallic materials and the flame-retardant category (Class A, B, C, D);<br>2. For cables laid in bundles within the hotel, the flame-retardant performance shall not be lower than Class C, and for important circuits (such as fire protection and emergency), it shall not be lower than Class B. |