The existing installation consists of this:
200 A 120/240 V single phase residential electrical service, installed circa ~1970.
200 A Fusible disconnect located Back to Back with the electrical meter.
The load side of the disconnect feeds ~4/0 AL to a 200 A load center panel (~40' away) with a 200 A main breaker, AND also via additional lugs on the load side #2 AL through a 30' run of 1" EMT to an exterior mounted 100 A fusible disconnect switch with 100 A fuses.
The load side lugs feed three sets of conductors (all less than 25' in length) to three fusible disconnects.
Unit #1 has #8 fused according to the AC's Max of 50 A with 50 A fuses
Unit #2 has #8 fused according to the AC's Max of 25 A with 45 A fuses
Unit #3 has #10 fused according to the AC's FLA of 9.5 with 20 A fuses
A few concerns exist...
1) The length of the #2 AL conductors to the 100 A fusible disconnect.
2) Sizing of the fuses for the #2 AL.
3) Triple lugging of conductors on the load side of the 100 A fusible disconnect.
4) Is this considered a tap of a tap? Or does the second set of fuses permit this?
Obviously the AC fuses need to be properly sized.
Are there any other code concerns regarding this installation?
Thanks!!
200 A 120/240 V single phase residential electrical service, installed circa ~1970.
200 A Fusible disconnect located Back to Back with the electrical meter.
The load side of the disconnect feeds ~4/0 AL to a 200 A load center panel (~40' away) with a 200 A main breaker, AND also via additional lugs on the load side #2 AL through a 30' run of 1" EMT to an exterior mounted 100 A fusible disconnect switch with 100 A fuses.
The load side lugs feed three sets of conductors (all less than 25' in length) to three fusible disconnects.
Unit #1 has #8 fused according to the AC's Max of 50 A with 50 A fuses
Unit #2 has #8 fused according to the AC's Max of 25 A with 45 A fuses
Unit #3 has #10 fused according to the AC's FLA of 9.5 with 20 A fuses
A few concerns exist...
1) The length of the #2 AL conductors to the 100 A fusible disconnect.
2) Sizing of the fuses for the #2 AL.
3) Triple lugging of conductors on the load side of the 100 A fusible disconnect.
4) Is this considered a tap of a tap? Or does the second set of fuses permit this?
Obviously the AC fuses need to be properly sized.
Are there any other code concerns regarding this installation?
Thanks!!