one of many to follow Im sure but ......

[i=p/u]

X 20 for d

 

[malcolmsanford]

No lofty a type d would be 20 times so it would be 40*20 = 800 and then 230/800 = 0.2875 and table 41.3 is 0.29

 

[lofty84]

In the event of an earth fault on the HV side of a substation the LV instillation may be affected by

a)V
b)U
c)I
d)Isqt

im trying to use the contents page in the brb page 3 to find something to go on but cant ...

 

[lofty84]

found substations in the index and under reg 442.2 it says either Uf U1 or U2 so it must me U. what does U represent again please ..

 

[malcolmsanford]

It is no good us giving you the answers really but a guide have a look and read of section 442 of the BRB

 

[malcolmsanford]

Symbols page 36 but well done for finding 442.2

 

[SimpleSimon]

found substations in the index and under reg 442.2 it says either Uf U1 or U2 so it must me U. what does U represent again please ..

If you are who i think you are....i found you

Sent from my GT-I9100 using Tapatalk

 

[lofty84]

nice one mal

 

[lofty84]

u have mate

 

[lofty84]

u = voltage between lines.

Hard to get to grips with but this red book is good

 

[malcolmsanford]

u = voltage between lines.

Hard to get to grips with but this red book is good

Keep at it son taken me nigh on 40 yrs and it is still a mystery

 

[lofty84]

A 70 degrees C thermoplasic insulated and sheathed cable to BS6004 is installed in an ambient temperature of 25 C for part of the run and then enters an area of 40 degrees C. the effect on the cable will be to....

Im trying to find the answer to this by useing the regs but what do I look up in the book

 

[SimpleSimon]

Didnt take long but glad to see you on here. Glad to see your asking questions still. Just remember your power triangles thats the key to alot of it.

Sent from my GT-I9100 using Tapatalk

 

[SimpleSimon]

A 70 degrees C thermoplasic insulated and sheathed cable to BS6004 is installed in an ambient temperature of 25 C for part of the run and then enters an area of 40 degrees C. the effect on the cable will be to....

Im trying to find the answer to this by useing the regs but what do I look up in the book

Pg. 325 table 4b1
Sent from my GT-I9100 using Tapatalk

 

[lofty84]

lol im full of em mate, annoying im sure but needs must and all that..