Juniper Networks J4350 - Manual (Page 262)

J4350 and J6350 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.
242 Compliance Statements for EMC Requirements