Voltage Drop Branch of radial circuit

[ianphilip007]

hi guys

Need some help in calculating voltage drop on a branched radial circuit. (13A design load 2.5mm cable)( cu to junction box 8m 2.5mm)

for a standard loop in loop out radial it would be IbxDxmV/m/1000

this circuit has 2 branches from the junction box

one/ 10m long ( 1 double socket)

2nd 27m long ( 3 double sockets)

can any one help re Volt drop

 

[telectrix]

easy. calculate the VD at the junction using the sum of the Ib 's of each branch. then calculate each branch and add on to get the 3 values.

 

[Pete999]

Need more info, anticipated load, OCPD type, installation method etc etc

 

[ianphilip007]

thanks tel. so if each branch has a design load of 13Amps then the volt drop at the Junction box would be , 13+13x8x18/1000 = 3.74v

branch 1) 13x10x18/1000 = 2.34
branch 2) 13x27x18/1000 =6.318

to note desgin load total circuit 13A

is my thinking correct ??

 

[telectrix]

not quite. if your OCPD is 16A, then that's your max. Ib for the circuit. likewise if it's 20A then your Ib is 20A (max.).