Juniper J2300 Getting Started Manual page 280

J2300, J4300, and J6300 Services Router Getting Started Guide
CAUTION: 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 together. This precaution
may be particularly important in rural areas.
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Compliance Statements for EMC Requirements