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what is the difference between cable routing and scheduling?
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Answer Posted / victorvgp
In general cable routing doc. shows inf. about how cables
are routed in cable trays, trenches and duct banks.
Whereas, cable schedule shows inf. about the specification
of cables along with the inf. listed at the end.
cable routing - cable routing cross section layout (or)
cable routing layout
In cable routing cross section layout, cross section of a
particular [DBE(Electrical Duct Bank)/CTE(Electrical Cable
Trench)] is showned, which shows the actual dimensions of
DBE/CTE and how the cables are arranged as per the type
(LV/MV), requirement and sequence.
Cable shedule is of two types one is Internal Cable
Schedule and External Cable Schedule.
INTERNAL:
In this doc. inf. of cables run inside the
substations such as Transformer to Busbar, Busbar to Switch
board like that.,
EXTERNAL:
In this doc. inf. of cables run outside the
substation such as from Switch board to LDB, Switch board
to Equipment/LCS like that.,
The following inf. are available in cable schedule:
1. Cable id no.
2. From which equipment/SB
3. To which equipment/SB
4. Substation No.
5. Unit no.
6. Cable type(cu/xlpe/swa)
7. Cable voltage[.6/1]or[3.6/6(7.2)]
8. Remarks(inf. about work nature of cable) etc.,
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We have drive feeding an output contactor for a 5000 hp motor @ 5kV application. The motor FLA is 629amps x 1.25% service factor = 786.25 amps The cable that we current have in place between the drive and the output contactor is 350kcmil- MV-105 (parallel cables). Per the NEC table 310.60 (C) (69). This show the cable ampacity is at 615 amps per cable for a rating of 1230 amps. We have derated the cable for the cable tray and the multiple cables application and our calculations show that after the correction factor factor we are at 922amps. 1230 amps x .75% correction factor factor = 922.5 amps. The customer is driving us to then use another safety factor of .25% off of the already derated cable. Can you please provide a longhand calculation for your solution on this application?
