Page 303 - Offshore Electrical Engineering Manual

290 CHAPTER 2 Electrical System Earthing

(A) HV -SWITCHBOARD
PE
STRUCTURE
PE
MODULE
MAIN
EARTH BAR

M MIN 10 MM 2
~
PE MIN 10 MM 2
MODULE
MAIN STRUCTURE
EARTH BAR HV-MOTORS
PE
(B) LV SWITCHBOARD
PE
MODULE STRUCTURE
MAIN NOTE 1 10-70 MM 2
EARTH BAR M
~
PE
10-70 MM 2 NOTE 2
TRANSFORMER STRUCTURE
MOTORS
PE
NOTE 1
NOTE 2 10-70 MM 2
STRUCTURE
MISCELLANEOUS EQUIPMENT
PE
MODULE NOTE 8 NOTE 9
MAIN NOTE 1
EARTH BAR LIGHTING & SMALLPOWER
DISTRIBUTION PANEL LIGHT FIXTURES
NOTE 1
NOTE 2
PE WELDING OUTLET
STRUCTURE
(C) FIELD MODULE SWITCHBOARD
PE
PE STRUCTURE
MODULE
MAIN
EARTH BAR

PE
FIGURE 5.2.1
(A) Typical earthing for high-voltage (HV) switchboard. (B) Typical earthing for low-
voltage (LV) switchboard. Note 1, earthed conductor may be in supply cable; Note
2, bonding conductors minimum 10 mm copper; Note 8, bonding via fixing bolts or
2
2
10 mm conductor. (C) Typical earthing: field. PE, protective earth.