The document discusses cable penetration through substation walls at KGP. It addresses cables in cable trays, cables from trays to multi-cable transit devices, and cables penetrating substation walls. Recommendations are provided to verify cable tray fill meets standards, support is sufficient, and consideration is given to future cable additions. Stress on cables entering transit devices should be prevented, and proper installation of multi-cable transit systems is required according to specifications and standards.

1. CABLE PENETRATIONCABLE PENETRATION
THROUGH SUBSTATIONTHROUGH SUBSTATION
WALLS AT KGPWALLS AT KGP
Presented by:Presented by:
Abdullah Al-DushaishiAbdullah Al-Dushaishi
Electrical Quality EngineerElectrical Quality Engineer
KPIS/KGPIUKPIS/KGPIU
July 2007July 2007

2. OUTLINEOUTLINE
 Cables in Cable TraysCables in Cable Trays
 Cables from Cable Trays to Multi-CableCables from Cable Trays to Multi-Cable
Transit (MCT)Transit (MCT)
 Cables Penetrating Substation WallsCables Penetrating Substation Walls

3. Cables in Cable TraysCables in Cable Trays
 Does the number of cables or total cross-sectional area
permitted in a single cable tray meet the requirements of
NEC?
 Are supports sufficient to meet the load requirement of the
cables?
 Is consideration given to the loads associated with future
cable additions?
PID Recommendations I

4. Cables in Cable TraysCables in Cable Trays
Q: Does the number of cables or total cross-sectional area
permitted in a single cable tray meet the requirements of
NEC?
Ref.: NEC ARTICLE 392 Cable Trays
392 . 9 (A) (2)

5. Ref.: NEC ARTICLE 392 Cable Trays
392 . 9 (A) (2)

6. Cables in Cable TraysCables in Cable Trays
Q: Are supports sufficient to meet the load requirement of
the cables?
Q: Is consideration given to the loads associated with future
cable additions?
Ref.: NEMA VE 2; Para. 4.2.1

7. Cables in Cable TraysCables in Cable Trays
Cable Tray Fill Area Calculation Case study

8. Cables in Cable TraysCables in Cable Trays
Cable Tray Support Design Calculation
81.67 kg/m

9. Cables in Cable TraysCables in Cable Trays
CableCable
Tray #Tray #
Cable SizeCable Size
No. ofNo. of
CablesCables
Area ofArea of
CablesCables
(mm2)(mm2)
Total AreaTotal Area
(mm2)(mm2)
CableCable
TrayTray
Fill %Fill %
CablesCables
WeightWeight
kg/mkg/m
CableCable
TrayTray
Load %Load %
233-415233-415
3C-35+1C-3C-35+1C-
1616
6262 43825.3243825.32
74259.5774259.57 412.55%412.55%
239.183239.183
66
292.87%292.87%
19C-2.519C-2.5 6262 30434.2530434.25
233-32233-32
3C-35+1C-3C-35+1C-
1616
3232 22619.5222619.52
38327.5238327.52 212.93%212.93%
123.449123.449
66
151.16%151.16%
19C-2.519C-2.5 3232 15708.0015708.00

10. PID Recommendations IPID Recommendations I
 Contractor shall provide cable tray fill percentage schedule
for PID review
 Contractor shall verify cable tray load calculation
 Contractor shall prove considering future needs

11. Cables from Cable TraysCables from Cable Trays
to Multi-Cable Transitto Multi-Cable Transit
(MCT)(MCT)
 Is sufficient protection provided to cables?
 Is stress prevented where cables enter MCT?
 Are cables supported in intervals not exceeding
NEC limits?
PID Recommendations II

12. Cables from Cable TraysCables from Cable Trays
to Multi-Cable Transitto Multi-Cable Transit
(MCT)(MCT)
Q: Is sufficient protection provided to cables?

13. Cables from Cable TraysCables from Cable Trays
to Multi-Cable Transitto Multi-Cable Transit
(MCT)(MCT)

14. Cables from Cable TraysCables from Cable Trays
to Multi-Cable Transitto Multi-Cable Transit
(MCT)(MCT)
Q: Is stress prevented where cables enter MCT?
Ref.: NEC ARTICLE 392 Cable Trays
392 . 6 C

15. Cables from Cable TraysCables from Cable Trays
to Multi-Cable Transitto Multi-Cable Transit
(MCT)(MCT)
Q: Are cables supported at intervals not exceeding
NEC limits?
Ref.: NEC ARTICLE 320 Armored Cable: Type AC
320 . 30 C

16. PID Recommendations IIPID Recommendations II
 Contractor shall make sample installation for protection the cable
from the tray sharp edge.
This sample shall be accepted by PID and the PROPONANT.
 Contractor shall prevent stress for the cable everywhere
 Contractor shall verify that cables supported in intervals not
exceeding NEC limits
Contractor shall avoid supporting the cable by the structure
 Contractor shall use T-fittings to solve all problems wherever he
can

17. Cables PenetratingCables Penetrating
Substation WallsSubstation Walls
Are the cables entering the right MCT as mentioned in
cable schedule?
 Is the CONTRACTOR able to use MCT professionally in
this stage?
PID Recommendations III

18. Cables PenetratingCables Penetrating
Substation WallsSubstation Walls
Q: Are the cables entering the right MCT as
mentioned in cable schedule?

19. Cables PenetratingCables Penetrating
Substation WallsSubstation Walls
Q: Is the CONTRACTOR able to use MCT system
professionally at this stage?!

20. Cables PenetratingCables Penetrating
Substation WallsSubstation Walls
Hawke Transit System Catalogue

22. PID Recommendations IIIPID Recommendations III
 Contractor shall make sample installation of MCT

23. Thank You