Compliance and Safety Manual RRU3249 Issue 01 Date 2014-9-1 HUAWEI TECHNOLOGIES CO., LTD.
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1 Safety 1 Safety About This Chapter 1.1 Health and Safety 1.2 Equipment Safety 1.3 Electromagnetic Field Exposure 1.1 Health and Safety 1.1.1 Overview 1.1.2 Electrical Safety 1.1.3 Inflammable Environment 1.1.4 Radiation 1.1.5 Working at Heights 1.1.6 Mechanical Safety 1.1.7 Bundling Signal Cables 1.1.1 Overview Introduction This section describes the safety precautions you must take before installing or maintaining Huawei equipment.
1 Safety Only trained and qualified personnel are allowed to install, operate, and maintain Huawei equipment. To assure continued compliance, any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment. Local Safety Regulations When operating Huawei equipment, you must follow the local laws and regulations. The safety instructions in this document are only supplements to the local laws and regulations.
1 Safety To minimize the risk of fire, use only No. 26 AWG or larger telecommunication line cord. Human Safety Do not operate the device or cables during lightning strikes. To avoid electric shock, do not connect safety extra-low voltage (SELV) circuits to telecommunication network voltage (TNV) circuits. Move or lift the chassis by holding its lower edge. Do not hold the handles on certain modules such as power supply, fans, and boards because they cannot support the weight of the device.
1 Safety Non-standard and improper high voltage operations may result in fire and electric shock. Therefore, you must abide by the local rules and regulations when bridging and wiring AC cables. Only qualified personnel are allowed to perform high voltage and AC operations. Before powering on a device, ground the device. Otherwise, personal injury or device damage may be caused by high leakage current.
1 Safety Do not install or remove power cables when the device is on. Transient contact between the core of the power cable and the conductor may generate electric arcs or sparks, which may cause fire or hurt human eyes. Before installing or removing the power cable, turn off the power switch. Before connecting a power cable, check that the label on the power cable is correct. If the device is connected with the DC power supply, use 1.5 mm2 或 14AWG minimum power supply cord.
1 Safety When handling optical fibers, do not stand close to or look at the optical fiber outlet directly with unprotected eyes. General Laser Information Laser transceivers or transmitters are used in optical transmission systems and associated test tools. The wavelength of the laser is between 780 nm and 1600 nm. The laser transmitted through optical fibers has very high power density and is invisible to human eyes. A beam of light causes damage to the retina.
1 Safety Before cutting or splicing a fiber, ensure that the fiber is disconnected from the optical source. After disconnecting the fiber, use protecting caps to protect all the optical connectors. 1.1.5 Working at Heights Avoid object falling when you work at heights. When working at heights, fulfill the following requirements: Only trained personnel can work at heights. Prevent the devices and tools that you carry from falling down.
1 Safety Figure 1-1 Hoisting heavy objects Using Ladders Checking a Ladder Before using a ladder, check whether the ladder is damaged. Only the ladder in good condition can be used. Before using a ladder, you should know the maximum weight capacity of the ladder. Avoid overweighing the ladder. Placing a Ladder The recommended gradient of ladders is 75 degrees. You can measure the gradient of the ladder with an angle square or your arms.
1 Safety Do not climb higher than the fourth rung of the ladder (counted from up to down). If you want to climb up a roof, ensure that the ladder top is at least one meter higher than the roof. 1.1.6 Mechanical Safety Drilling Holes Do not drill the cabinet at will. Drilling holes without complying with the requirements affects the electromagnetic shielding performance of the cabinet and damages the cables inside the cabinet.
1 Safety Do not bundle signal cables with high current cables or high voltage cables. Maintain a minimum space of 150 mm between adjacent ties. 1.2 Equipment Safety 1.2.1 Electricity Safety 1.2.2 Electrostatic Discharge 1.2.3 Installing and Removing a Board 1.2.4 Laying Cables 1.2.1 Electricity Safety Thunderstorm During thunderstorms, the electromagnetic field generated in the thunderstorm area may damage the electronic parts.
1 Safety 1.2.2 Electrostatic Discharge The static electricity generated by human bodies may damage the electrostatic-sensitive components on boards, for example, the large-scale integrated (LSI) circuits. Human body movement, friction between human bodies and clothes, friction between shoes and floors, or handling of plastic articles causes static electromagnetic fields on human bodies. These static electromagnetic fields cannot be eliminated until the static is discharged.
1 Safety To prevent electrostatic-sensitive devices from being damaged by the ESD, do not touch the circuits, components, connectors, or connection slots on boards. 1.2.4 Laying Cables When the temperature is very low, violent strike or vibration may damage the cable sheathing. To ensure safety, comply with the following requirements: Cables can be laid or installed only when the temperature is higher than 0 .
1 Safety If areas with excessive RF radiation are accessible to the operation and maintenance (O&M) personnel, ensure that they know the source of radiation and can power off or shut down the transmitters before entering high radiation areas. In addition, such areas must be confined within a distance of 10 m from the antennas. Each exclusion zone should be defined by a physical barrier and by a recognizable sign warning the public or O&M personnel.
1 Safety A rough estimation of the expected exposure in power flux density on a given point can be made with the following equation: S = (P(W) x Gnumeric)/(4 x r²(m) x π) Where, P = Maximum output power at antenna port of the BTS in W Gnumeric = Numeric gain (see below) r = Distance between the antenna and the point of exposure in meters For the calculation of the Gnumeric, Gnumeric = 10GdB/10 GdB = Gantenna(dB) – Bcable(dB) – Bvertical-attenutation(dB) – Bhorizontal-attenuation(dB) B = attenuation in dB
