HP Networking Safety and Compliance manual Grounding, Earth leakage current

•Pluggable PDUs must be disconnected from the product and unplugged from the AC electrical outlet before servicing or replacing the product.

•Do not overload the output of PDUs. The total connected load should not exceed rated input power.

•To reduce the risk of electric shock due to high leakage currents, ensure that there is a reliable grounded (earthed) connection before connecting power distribution products to AC power.

If a large number of products will be connected to a single PDU, it may be necessary to conduct an evaluation of the installation to verify the total amount of leakage current. The total combined leakage current should not exceed 5 percent of the input current for the PDU and associated load.

Grounding

Depending on the product model, your product will be classified either as a safety Class I or safety Class II-compliant device. Class I devices require a connection to earth ground (3-terminal plug); Class II devices incorporate a 2-terminal plug.

•Class I: There must be an uninterruptible safety earth ground from the main power source to the product's power cord or supplied power cord set. Whenever it is likely that the protection has been impaired, disconnect the power cord until the ground has been restored.

•Class II: Safety Class II-compliant devices include supplemental insulation to protect against electric shock, and do not require a connection to earth ground.

For LAN connections:

•If your LAN covers an area served by more than one power distribution system, be sure their safety grounds are securely interconnected.

•LAN cables may occasionally be subject to hazardous transient voltages (such as lightning or disturbances in the electrical utilities power grid). Handle exposed metal components of the network with caution.

•This product and all interconnected equipment must be installed indoors within the same building, including all associated LAN connections as described by Environment A of the IEEE 802.3af standard.

Earth leakage current

To reduce the risk of electric shock due to high leakage currents, ensure that there is a reliable grounded (earthed) connection before connecting power distribution products to AC power. Observe the following limits when connecting the product to AC power distribution devices:

•For UPS products and PDUs that have attached AC power cords or are directly wired to the building power, the total combined leakage current should not exceed 5 percent of the rated input current for the device.

•For UPS products and PDUs that have detachable AC power cords, the total combined leakage current should not exceed 3.5mA.

Electrostatic discharge (ESD)

When handling any electronic component or assembly (such as a PCI card or memory DIMM), you must observe the following antistatic precautions to prevent damage. An ESD kit (HP P/N A3024-80004) is available (or supplied with memory additions). This kit contains one wrist strap, one conductive sheet, and one antistatic foam pad.

•Always disconnect power from the server and wear a grounded wrist strap when working around the server.

•Always wear a grounded wrist strap when handling printed circuit boards.

10 Safety precautions