S
smiffey
Good evening all,
OK so here goes-
I was asked to quote for a new dis board on a factory today with The Main feed being100amps going to a small 3 phase board in another building so-
-Main incomer 100a 3 phase
-50 meters of wire to a second board
-Second board with a 100a rccd acting as the main switch.
I automaticly thought 25mm 4 core swa clipped direct nice easy job as it would be under the volt drop and max rateing of the cable.
Then the customer tells me he has already bought the new board, main disconnector, and 50 meters of 16mm sy 4 core and im to use that?
Could someone give me a bit of a hand with the cable cals as i think the 16mm is to small due to my working out?
Design current 100amps
Supply voltage 415volts
Fuse rateing 101amps
Cable length 50 meters
ca 1.02 page 267 table 4b1
cg 1.00 page 262 table 4a2 refrence method c
cc 1.00
volt drop 7.37v (1.77%) pf 1.0
so the actual cable rateing is 124amps
where as on a 16mm
volt drop 23.40v (5.64%) so over the max 5%
and the actual cable rateing is 73amps!
hope i can sort it out as i have to give him an answer tomorrow.
cheers in advance Ashley
OK so here goes-
I was asked to quote for a new dis board on a factory today with The Main feed being100amps going to a small 3 phase board in another building so-
-Main incomer 100a 3 phase
-50 meters of wire to a second board
-Second board with a 100a rccd acting as the main switch.
I automaticly thought 25mm 4 core swa clipped direct nice easy job as it would be under the volt drop and max rateing of the cable.
Then the customer tells me he has already bought the new board, main disconnector, and 50 meters of 16mm sy 4 core and im to use that?
Could someone give me a bit of a hand with the cable cals as i think the 16mm is to small due to my working out?
Design current 100amps
Supply voltage 415volts
Fuse rateing 101amps
Cable length 50 meters
ca 1.02 page 267 table 4b1
cg 1.00 page 262 table 4a2 refrence method c
cc 1.00
volt drop 7.37v (1.77%) pf 1.0
so the actual cable rateing is 124amps
where as on a 16mm
volt drop 23.40v (5.64%) so over the max 5%
and the actual cable rateing is 73amps!
hope i can sort it out as i have to give him an answer tomorrow.
cheers in advance Ashley