Download Common Practice Issues for Electrical 2011 PDF

TitleCommon Practice Issues for Electrical 2011
TagsElectromagnetic Compatibility Electrical Wiring Electrical Connector Cable Electrical Conductor
File Size4.0 MB
Total Pages39
Document Text Contents
Page 20

26th May [email protected]


P r o t e c t i o n R e l ay ke e p s t r i p p i n g o n
M o t o r S t a r t i n g

M a ny r e a s o n s c a n b e att r i b u t e d to t h i s
p h e n o m e n o n :


 Mechanical system issues

 Mismatch in protection device and motor starting surge.

Page 38

26th May [email protected]

COP83 - Supervision of work on LV 3-phase installations shall be under direct
responsibility of Wireman (3-phase restriction). The Wireman shall be
required to certify completion under Form G.
COP 84 – Testing for single phase installation shall be by Wireman (single-
phase or 3-phase restriction) under Form H.
COP 85 – Testing for 3-phase installation shall be by Wireman (3-phase
restriction) under Form H.
COP86 – Other installation at higher than low voltage shall be tested by a
Electrical Services Engineer under Form H.
COP87 – Electricity SHALL NOT BE CONNECTED until Forms G & H are
submitted by the owner or building operator.
COP88 – Insulation measurements shall be carried out on LV installation
using dc voltages. Where 500Vdc is applied, the insulation resistance shall be
more than 1MΩ.
COP91 – Every completed installation shall have as-built electrical diagrams
prominently displayed. Diagrams shall be endorsed by the professional
design electrical engineer.


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