How can the tape of this tie open? I cut it with scissors
The general practice is to use flat steel in the bridge through the long ground. Reason: According to the requirements of the specification, the bridge is not less than two points and the ground connection reliable connection, in order to ensure the reliability of grounding, the conventional practice is to lay a long flat steel in the bridge. This requirement is regardless of the ordinary bridge or fire distribution with the fire bridge, are required to do. Supplementary reference: For example, "Code for construction and acceptance of grounding installations for electrical installations" GB-2006 Section 3.4.6: Laying of copper wires along the cable tray, galvanized flat steel and the use of metal structures along the bridge, such as When installing the metal components for the bracket as the grounding line, the cable bridge shall be grounded in accordance with the following provisions: 1 When the total length of the cable bridge is not more than 30m, it shall not be less than 2 connected with the grounding trunk. When the total length is more than 30m, Every 20m ~ 30m increase with the grounding point of the connection point; 3 cable bridge starting and end ends should be connected with the grounding network.
absolutely okay. PVC wire tube open erection of the general life of 15 to 20 years, buried in the cement slurry life can reach more than 50 years, as long as the joints on the wall, the construction does not break the PVC pipe surface water will not enter the pipe, Moreover, the insulation of the electric insulation and the bathroom is not large, as long as not more than 6KW, with the sun card 2.5 flat copper wire current is enough, when laying the ground if the same time to do more secure water treatment, you said there will be What hidden trouble?
In the short distance there is no impact, if long, of course, will be the impact of the main electromagnetic impact, in 30 meters generally no impact ~ ~ long no ~ ~!
