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Safety Information

Definitions of Safety Warning Levels

The documentation uses the following levels of safety warnings (there are two Warning formats):


You might find this information helpful in a particular situation, or you might overlook this important information if it was not highlighted in a Note.


You need to observe the specified guidelines to prevent minor injury or discomfort to you or severe damage to the device.

Laser Warning:

This symbol alerts you to the risk of personal injury from a laser.


This symbol means danger. You are in a situation that could cause bodily injury. Before you work on any equipment, be aware of the hazards involved with electrical circuitry and be familiar with standard practices for preventing accidents.

  • Do not perform any actions that create a potential hazard to people or make the equipment unsafe.

  • Never install or manipulate wiring during electrical storms.

  • Operate the device only when it is properly grounded.

  • Follow the instructions in this guide to properly ground the device to earth.

  • Replace fuses only with fuses of the same type and rating.

Installation Instructions Warning


Read the detailed installation instructions before you connect the device to a power source.

General Safety Guidelines and Warnings

The following guidelines help ensure your safety and protect the device from damage. The list of guidelines might not address all potentially hazardous situations in your working environment, so always be alert and exercise good judgment.

  • Perform only the procedures explicitly described in the hardware documentation for this device. Make sure that only authorized service personnel perform system services.

  • Keep the area around the device clear and free from dust before, during, and after installation.

  • Keep tools away from areas where people could trip over them while walking.

  • Do not wear loose clothing or jewelry, such as rings, bracelets, or chains, which could become caught in the device.

  • Wear safety glasses if you are working under any conditions that could be hazardous to your eyes.

  • Never attempt to lift an object that is too heavy for one person to handle.

  • Never install electrical jacks in wet locations unless the jacks are specifically designed for wet environments.

  • Operate the device only when it is properly grounded and follow instructions in our detailed installation instructions for properly grounding the device to earth.

  • Do not open or remove chassis covers or sheet‐metal parts unless instructions are provided in the hardware documentation for this device. Such an action could cause severe electrical shock.

  • Do not push or force any objects through any opening in the chassis frame. Such an action could result in electrical shock or fire.

  • Avoid spilling liquid onto the chassis or onto any device component. Such an action could cause electrical shock or damage the device.

  • Avoid touching uninsulated electrical wires or terminals that have not been disconnected from their power source. Such an action could cause electrical shock.

  • Some parts of the chassis, including power supply surfaces, power supply unit handles, line card handles, and fan tray handles might become hot. The following label provides the warning of the hot surfaces on the chassis:

  • Always ensure that all modules, power supplies, and cover panels are fully inserted and that the installation screws are fully tightened.

  • Single/two‐hole system grounding is preferred for AC and DC. AC can also use the grounding pin in the power cord, and DC can use the PSU lug or the power cord ground if present.

  • Users should not attempt to make electrical ground connections by themselves but should contact the appropriate inspection authority or an electrician, as appropriate.

  • Users should ensure for their own protection that the electrical ground connections of the power utility, telephone lines, and internal metallic water pipe system, if present, are connected. This precaution may be particularly important in rural areas.

  • Before removing or installing components in our device, connect an electrostatic discharge (ESD) grounding strap to an ESD point and wrap and fasten the other end of the strap around your bare wrist. Failure to use an ESD grounding strap could result in damage to the device.

  • Install the device in compliance with the following local, national, and international electrical codes:

    • United States—National Fire Protection Association (NFPA 70) United States National Electrical Code.

    • Other countries—International Electromechanical Commission (IEC) 60364, Part 1 through Part 7.

    • Canada—Canadian Electrical Code, Part 1, CSA C22.1.

  • Evaluated to the TN power system.

  • Suitable for installation in Information Technology Rooms in accordance with Article 645 of the National Electrical Code and NFPA 75.

  • Locate the emergency power‐off switch for the room in which you are working so that if an electrical accident occurs, you can quickly turn off the power.

  • Make sure that grounding surfaces are cleaned and brought to bright finish before grounding connections are made.

  • Do not work alone if potentially hazardous conditions exist anywhere in your workspace.

  • Never assume that power is disconnected from circuit. Always check the circuit before starting to work.

  • Carefully look for possible hazards in your work area, such as moist floors, ungrounded power extension cords, and missing safety grounds.

  • Operate the device within marked electrical ratings and product usage instructions.

  • To ensure that the device and peripheral equipment function safely and correctly, use the cables and connectors specified for the attached peripheral equipment, and make certain they are in good condition.

  • Never install equipment that appears to be damaged.

  • Before working on equipment that is connected to power lines, remove jewelry, including rings, necklaces, and watches. Metal objects heat up when connected to power and ground and can cause serious burns or can be welded to the terminals.

  • AC‐powered devices are shipped with a three‐wire electrical cord with a grounding‐type plug that fits only a grounding‐type power outlet. Do not circumvent this safety feature. Equipment grounding must comply with local and national electrical codes.

  • You must provide an external certified circuit breaker (2‐pole circuit breaker or 4‐pole circuit breaker based on your device) rated minimum 13 A/16 A/20 A in the building installation.

  • The power cord serves as the main disconnecting device for the AC‐powered device. The socket outlet must be near the AC‐powered device and be easily accessible.

  • Before working on the device or near power supplies, unplug all the power cords from the device. All connections must be removed completely to remove power from the unit.

Prevention of Electrostatic Discharge Damage

Device components that are shipped in antistatic bags are sensitive to damage from static electricity. Some components can be impaired by voltages as low as 30 V. You can easily generate potentially damaging static voltages whenever you handle plastic or foam packing material or if you move components across plastic or carpets. Observe the following guidelines to minimize the potential for electrostatic discharge (ESD) damage, which can cause intermittent or complete component failures:

  • Always use an ESD wrist strap when you are handling components that are subject to ESD damage, and make sure that it is in direct contact with your skin.

  • If a grounding strap is not available, hold the component in its antistatic bag (see Figure 1) in one hand and touch the exposed, bare metal of the device with the other hand immediately before inserting the component into the device.


    For safety, periodically check the resistance value of the ESD grounding strap. The measurement must be in the range 1 through 10 Mohms.

  • When handling any component that is subject to ESD damage and that is removed from the device, make sure the equipment end of your ESD wrist strap is attached to the ESD point on the chassis.

  • If no grounding strap is available, touch the exposed, bare metal of the device to ground yourself before handling the component.

  • Avoid contact between the component that is subject to ESD damage and your clothing. ESD voltages emitted from clothing can damage components.

  • When removing or installing a component that is subject to ESD damage, always place it component-side up on an antistatic surface, in an antistatic card rack, or in an antistatic bag (see Figure 1). If you are returning a component, place it in an antistatic bag before packing it.

    Figure 1: Placing a Component into an Antistatic Bag Placing a Component into an Antistatic Bag

    ANSI/TIA/EIA-568 cables such as Category 5e and Category 6 can get electrostatically charged. To dissipate this charge, always ground the cables to a suitable and safe earth ground before connecting them to the system.

Site Electrical Wiring Guidelines

Table 1 describes the factors you must consider while planning the electrical wiring at your site.


You must provide a properly grounded and shielded environment and use electrical surge-suppression devices.

Table 1: Site Electrical Wiring Guidelines
Site Wiring Factor Guidelines

Signaling limitations

If your site experiences any of the following problems, consult experts in electrical surge suppression and shielding:

  • Improperly installed wires cause radio frequency interference (RFI).

  • Damage from lightning strikes occurs when wires exceed recommended distances or pass between buildings.

  • Electromagnetic pulses (EMPs) caused by lightning damage unshielded conductors and electronic devices.

Radio frequency interference

To reduce or eliminate RFI from your site wiring, do the following:

  • Use a twisted-pair cable with a good distribution of grounding conductors.

  • If you must exceed the recommended distances, use a high-quality twisted-pair cable with one ground conductor for each data signal when applicable.

Electromagnetic compatibility

If your site is susceptible to problems with electromagnetic compatibility (EMC), particularly from lightning or radio transmitters, seek expert advice.

Some of the problems caused by strong sources of electromagnetic interference (EMI) are:

  • Destruction of the signal drivers and receivers in the device.

  • Electrical hazards as a result of power surges conducted over the lines into the equipment.

Midplane Energy Hazard Warning


High levels of electrical energy are distributed across the midplane. Be careful not to contact the midplane connectors, or any component connected to the midplane, with any metallic object while servicing components.

AC Power Electrical Safety Guidelines

The following electrical safety guidelines apply to AC-powered devices:



For devices that have more than one power supply connection, you must ensure that all power connections are fully disconnected so that power to the device is completely removed to prevent electric shock. To disconnect power, unplug all power cords (one for each power supply).

DC Power Electrical Safety Guidelines

  • A DC-powered device is equipped with a DC terminal block that is rated for the power requirements of a maximally configured device.

  • For permanently connected equipment, a readily accessible disconnect device shall be incorporated external to the equipment.

  • For pluggable equipment, the socket-outlet shall be installed near the equipment and shall be easily accessible.

  • Be sure to connect the ground wire or conduit to a solid central office earth ground.

  • A closed loop ring is recommended for terminating the ground conductor at the ground stud.

  • Run two wires from the circuit breaker box to a source of 48 VDC.

  • A DC-powered device that is equipped with a DC terminal block is intended only for installation in a restricted-access location. In the United States, a restricted-access area is one in accordance with Articles 110-16, 110-17, and 110-18 of the National Electrical Code ANSI/NFPA 70.


    Primary over current protection is provided by the building circuit breaker. This breaker must protect against excess currents, short circuits, and earth grounding faults in accordance with NEC ANSI/NFPA 70.

  • Ensure that the polarity of the DC input wiring is correct. Under certain conditions, connections with reversed polarity might trip the primary circuit breaker or damage the equipment.

  • The marked input voltage of –48 VDC for a DC-powered device is the nominal voltage associated with the battery circuit, and any higher voltages are only to be associated with float voltages for the charging function.

  • Because the device is a positive ground system, you must connect the positive lead to the terminal labeled RTN, the negative lead to the terminal labeled –48 VDC, and the earth ground to the device grounding points.

DC Power Electrical Safety Warnings

When working with DC-powered equipment, observe the following warnings:

DC Power Copper Conductors Warning


Use copper conductors only.

DC Power Disconnection Warning


Before performing any procedures on power supplies, ensure that power is removed from the DC circuit. To ensure that all power is off, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the off position, and tape the switch handle of the circuit breaker in the off position and follow LOTO (Lock Out Tag Out) process.

DC Power Wiring Terminations Warning


When stranded wiring is required, use approved wiring terminations, such as closed-loop or spade-type with upturned lugs. These terminations must be the appropriate size for the wires and must clamp both the insulation and conductor.

DC Power Wiring Sequence Warning


Wire the DC power supply using the appropriate lugs. When connecting power, the proper wiring sequence is ground to ground, +RTN to +RTN, then –48 V to –48 V. When disconnecting power, the proper wiring sequence is –48 V to –48 V, +RTN to +RTN, then ground to ground. Note that the ground wire must always be connected first and disconnected last.

Multiple Power Supplies Disconnection Warning


The network device has more than one power supply connection. All connections must be removed completely to remove power from the unit completely.

Power Grounding Requirements and Warning

An insulated grounding conductor that is identical in size to the grounded and ungrounded branch circuit or DC supply conductors but is identifiable by green and yellow stripes is installed as part of the branch circuit or DC power source that supplies power to the device. The grounding conductor is a separately derived system at the supply transformer or motor generator set or DC power source.


When you install the device, the ground connection must always be made first and disconnected last.

TN Power Warning


The device is designed to work with a TN power system.

Action to Take After an Electrical Accident

If an electrical accident results in an injury, take the following actions in this order:

  1. Use caution. Be aware of potentially hazardous conditions that could cause further injury.

  2. Disconnect power from the device.

  3. If possible, send another person to get medical aid. Otherwise, assess the condition of the victim, then call for help.

Qualified Personnel Warning


Only trained and qualified personnel should install or replace the device.

Warning Statement for Norway and Sweden


The equipment must be connected to an earthed mains socket‐outlet.

Chassis and Component Lifting Guidelines

Before moving the device to a site, ensure that the site meets the power, environmental, and clearance requirements.

Before lifting or moving the device, disconnect all external cables and wires.

As when lifting any heavy object, ensure that most of the weight is borne by your legs rather than your back. Keep your knees bent and your back relatively straight. Do not twist your body as you lift. Balance the load evenly and be sure that your footing is firm.

Use the following lifting guidelines to lift devices and components:

  • Up to 39.7 lb (18 kg) : One person.

  • 39.7 lb (18 kg) to 70.5 lb (32 kg) : Two or more people.

  • 70.5 lb (32 kg) to 121.2 lb (55 kg) : Three or more people.

  • Above 121.2 lb (55 kg) : Material handling systems (such as levers, slings, lifts and so on) must be used. When this is not practical, specially trained persons or systems must be used (riggers or movers).

Restricted Access Warning


This unit is intended for installation in restricted access areas. A restricted access area is an area to which access can be gained only by service personnel through the use of a special tool, lock and key, or other means of security, and which is controlled by the authority responsible for the location.

Ramp Warning


When installing the device, do not use a ramp inclined at more than 10 degrees.

Rack‐Mounting and Cabinet‐Mounting Warnings

Ensure that the rack or cabinet in which the device is installed is evenly and securely supported. Uneven mechanical loading could lead to a hazardous condition. To prevent bodily injury when mounting or servicing the device in a rack, take the following precautions to ensure that the system remains stable.

The following instructions help maintain your safety:

  • The device must be installed in a rack that is secured to the building structure.

  • The device should be mounted at the bottom of the rack if it is the only unit in the rack.

  • When mounting the device on a partially filled rack, load the rack from the bottom to the top with the heaviest component at the bottom of the rack.

  • If the rack is provided with stabilizing means, install the stabilizers before mounting or servicing the device in the rack.

Grounded Equipment Warning


This device must be properly grounded at all times.

Radiation from Open Port Apertures Warning


Because invisible radiation might be emitted from the aperture of the port when no fiber cable is connected, avoid exposure to radiation and do not stare into open apertures.

Unterminated optical connectors can emit invisible laser radiation. The lens in the human eye focuses all the laser power on the retina, so focusing the eye directly on laser source—even a low‐power laser—could permanently damage the eye.

General Laser Safety Guidelines

When working around ports that support optical transceivers, observe the following safety guidelines to prevent eye injury:

  • Do not look into unterminated ports or at fibers that connect to unknown sources.

  • Do not examine unterminated optical ports with optical instruments.

  • Avoid direct exposure to the beam.

Laser and LED Safety Guidelines and Warnings

Juniper Networks devices are equipped with laser transmitters, which are considered a Class 1 or Class 1M Laser Products by the U.S. Food and Drug Administration and are evaluated as a Class 1 Laser Product per EN 60825-1 and EN 60825-2 requirements.

Observe the following guidelines and warnings:

Class 1M Laser Product Warning


Class 1M laser product.

Class 1M Laser Radiation Warning


Class 1M laser radiation when open. Do not view directly with optical instruments.

Class 1 Laser Product Warning


Class 1 laser product.

Class 1 LED Product Warning


Class 1 LED product.

Laser Beam Warning


Do not stare into the laser beam or view it directly with optical instruments.

Unterminated Fiber-Optic Cable Warning


Invisible laser radiation might be emitted from the unterminated connector of a fiber-optic cable. To avoid injury to your eye, do not view the fiber optics with a magnifying optical device, such as a loupe, within 100 mm.

Maintenance and Operational Safety Guidelines and Warnings

While performing the maintenance activities for devices, observe the following guidelines and warnings:

Battery Handling Warning


Replacing a battery incorrectly might result in an explosion. Replace a battery only with the same or equivalent type recommended by the manufacturer. Dispose of used batteries according to the manufacturer's instructions.

Jewelry Removal Warning


Before working on equipment that is connected to power lines, remove jewelry, including rings, necklaces, and watches. Metal objects heat up when connected to power and ground and can cause serious burns or can be welded to the terminals.

Lightning Activity Warning


Do not work on the system or connect or disconnect cables during periods of lightning activity.

Operating Temperature Warning


To prevent the device from overheating, do not operate it in an area that exceeds the maximum recommended ambient temperature. To prevent airflow restriction, allow at least 6 in. (15.2 cm) of clearance around the ventilation openings.

Product Disposal Warning


Disposal of this device must be handled according to all national laws and regulations.

Fire Safety Requirements

In the event of a fire emergency, the safety of people is the primary concern. You should establish procedures for protecting people in the event of a fire emergency, provide safety training, and properly provision fire-control equipment and fire extinguishers.

In addition, you should establish procedures to protect your equipment in the event of a fire emergency. Juniper Networks products should be installed in an environment suitable for electronic equipment. We recommend that fire suppression equipment be available in the event of a fire in the vicinity of the equipment and that all local fire, safety, and electrical codes and ordinances be observed when you install and operate your equipment.

Fire Suppression

In the event of an electrical hazard or an electrical fire, you should first turn power off to the equipment at the source. Then use a Type C fire extinguisher, which uses noncorrosive fire retardants, to extinguish the fire.

Fire Suppression Equipment

Type C fire extinguishers, which use noncorrosive fire retardants such as carbon dioxide and Halotron™, are most effective for suppressing electrical fires. Type C fire extinguishers displace oxygen from the point of combustion to eliminate the fire. For extinguishing fire on or around equipment that draws air from the environment for cooling, you should use this type of inert oxygen displacement extinguisher instead of an extinguisher that leaves residues on equipment.

Do not use multipurpose Type ABC chemical fire extinguishers (dry chemical fire extinguishers). The primary ingredient in these fire extinguishers is monoammonium phosphate, which is very sticky and difficult to clean. In addition, in the presence of minute amounts of moisture, monoammonium phosphate can become highly corrosive and corrodes most metals.

Any equipment in a room in which a chemical fire extinguisher has been discharged is subject to premature failure and unreliable operation. The equipment is considered to be irreparably damaged.


To keep warranties effective, do not use a dry chemical fire extinguisher to control a fire at or near a Juniper Networks device. If a dry chemical fire extinguisher is used, the unit is no longer eligible for coverage under a service agreement.

We recommend that you dispose of any irreparably damaged equipment in an environmentally responsible manner.