Answer: The method and requirements for laying metal hoses are as follows:
   (1) The diameter of the metal hose used for the wire protection pipe between electrical equipment and appliances shall not exceed 1.2m.

   (2) Metal hoses should be laid in dry places that are not susceptible to mechanical damage.

   (3) Metal hoses must not be buried directly in the ground or in concrete.

   (4) Metal hoses should not be untwisted or loose.

   (5) There should be no joints in the middle of the metal hose.

   (6) When connecting metal hoses to equipment and appliances, special joints should be used.

   (7) The metal hose connection should be sealed and reliable.

   (8) The radius of curvature of the metal hose installation shall not be less than 6 times the outer diameter of the hose.

   (9) The distance between the same fixed point of metal hose installation should not exceed 1m. The distance between the pipe card and the terminal and the midpoint of the elbow should be 300mm.

  (10) The joint of the liquid-proof metal hose should be well sealed.

  (11) When using metal hoses in special places such as moisture, liquid-proof metal hoses with non-metallic sheaths and matching connecting devices shall be used, and the jacket shall be flame-retarded.

  (12) Metal hoses shall be reliably grounded and shall not be used as a grounding conductor for electrical equipment.