Nortel Meridian 1 Planning And Installation Manual page 64

Page 44 of 590 Chapter 3 — System and site requirements
553-3021-209 Standard 1.00
Transformers without pluggable power cords
If the transformer does not have a pluggable cord, hardwire the transformer
to an electrical panel. Route all wires (including grounds) through a single
conduit.
Some electrical codes permit the use of conduit as the only ground conductor
between pieces of equipment.
Run a separate insulated ground conductor through the conduit to bond
chassis grounds together. Such a conductor maintains the safety ground
connection in the event that the conduit becomes corroded or disconnected.
Run all ground lines through the same conduit as the phase conductors that
serve the equipment. Figure 7 on page 45 shows the Isolation transformer
connections.
July 1999