I. Extension structure
The height of the microphone and receiver from the ground is 145±10cm.
Emergency telephone has weather-proof facilities.
Tunnel emergency telephone extension adopts metal box with steel plate thickness of more than 1.5mm, and adopts hot zinc spraying technology for antirust treatment, with zinc spraying thickness of 0.04 ~ 0.06 mm. After putty and water milling, orange car paint is sprayed twice, and baking varnish is carried out, with the color ensuring that it will not fade in nature for five years.
The emergency telephone extension door lock has anti-theft and rainproof functions.
The emergency telephone column is cuboid.
The call key is installed on the upper part of the call box.
There are two types of extension units: post type and wall-mounted type: the emergency telephone in the tunnel is wall-mounted type, and the post type is used outside the tunnel.
The extension door lock has anti-theft and rainproof functions
On the upper part of the telephone shell, there are directional reflective signs indicating emergency calls in the directions of car arrival and delivery. The patterns and colors of the signs meet the requirements of GB5768-1999, and there are instructions or patterns on the shell to make it easy for users to understand.
The emergency telephone extension and the upper part of the telephone shell are marked with the number of the destination telephone
The emergency telephone call post has a strong casing and firm installation to prevent theft or damage.
The telephone adopts split type, which comprises a microphone, a receiver, electronic components, buttons and a storage battery, which are respectively and firmly installed on the upper part of the calling box, and cables are connected through the end seats at the bottom. It should be convenient for transportation, installation and safety.
II. The extension working environment
The telephone column can work normally in the outdoor temperature environment of-40℃ ~+55℃
The emergency telephone console can work normally in the temperature environment of+5℃ ~+35℃
Humidity: 95 %( 35℃)
Waterproof performance: IP65
Emergency telephone has lightning protection equipment, which is used to put high voltage from any accident wave, especially lightning into the ground