Specifications

COMPLETE REVISION
PIP ELSGS01
July 2004 Design and Fabrication of High-Resistance Grounding System (600 Volts or Below)
Process Industry Practices Page 7 of 11
4.8.1.5 Wiring insulation shall be rated for 600 volts and a conductor
temperature of 90°C minimum.
4.8.1.6 A separate, properly labeled terminal strip shall be provided for
connection to remote devices.
4.8.1.7 Spare relay contacts shall be wired to terminal blocks.
4.8.1.8 Exposed wiring shall be neatly bundled, protected against contact
with sharp edges, and secured with wire ties. Adhesive-back wire
supports shall not be used to support wiring.
4.8.1.9 All wiring, except CT wiring, shall be terminated with seamless,
insulated, locking-fork type lugs, unless device terminals do not
allow their use.
4.8.1.10 CT circuit wiring shall be terminated with insulated, ring-type lugs,
unless device terminals do not allow their use.
4.8.1.11 Wiring to the resistor shall be rated for the operating temperature of
the resistor.
4.8.2 Terminal Blocks
4.8.2.1 Terminal blocks shall be front-accessible, rated for 600 volts, and
suitable for holding spade and ring-type lugs.
4.8.2.2 A maximum of two wires shall be connected at each side of each
terminal.
4.8.2.3 All purchaser-connected wiring shall be connected on one side of the
terminal block provided for external connections.
4.8.2.4 Separate terminal blocks shall be provided for terminating the
incoming neutral connection, the outgoing connection to ground, and
the connection to an external source of 120-volt AC control power if
required.
4.8.2.5 Each CT circuit shall be terminated in a properly identified shorting-
type terminal block.
4.8.2.6 A separate, suitably marked terminal strip shall be provided for all
resistor taps and to allow changing of taps from the front. An
engraved nameplate indicating various tap connections shall be
provided near this terminal strip.
4.8.3 Labeling
4.8.3.1 Each wire shall have permanent wire labels at both ends. Labels
shall be consistent with wiring diagrams. Adhesive-type wire labels
are not acceptable.
4.8.3.2 Relays, fuse blocks, terminal blocks, and other auxiliary devices
shall be labeled with nameplates.