Fuse box wiring
#1
Member
Thread Starter
Join Date: Feb 2011
Location: USA
Posts: 5
Upvotes: 0
Received 0 Upvotes
on
0 Posts
Fuse box wiring
Is this correct? The hot goes to the post on the fuse receptacle, the neutral and ground together go on the other part?
[IMG][/IMG]
[IMG][/IMG]
#3
Except....the inspector probably won't allow you to land the neutral and ground conductors under the same screw on the neutral bar as your drawing suggests. I believe rule-of-thumb is one neutral per hole, no more than two ground wires per hole and never ground and neutrals in the same hole. Correct me if I am wrong. Years ago it was pretty common to see neutral and ground wires landed together, but times and codes change.
#5
As far as I know, fuse boxes of that type are no longer manufactured. Although circuit breakers are closer to being foolproof than fuses ever were, fuses are, and always have been, the ultimate circuit protection.
#6
Except....the inspector probably won't allow you to land the neutral and ground conductors under the same screw on the neutral bar as your drawing suggests. I believe rule-of-thumb is one neutral per hole, no more than two ground wires per hole and never ground and neutrals in the same hole. Correct me if I am wrong. Years ago it was pretty common to see neutral and ground wires landed together, but times and codes change.
I can't see the pic.
#9
Member
Join Date: Mar 2006
Location: Wet side of Washington state.
Posts: 16,321
Received 38 Upvotes
on
30 Posts
Georgetown PowerPlant Museum in Seattle. Look closely and you will see it was once a 120 volt only panel but the bus bar at the bottom has been cut to allow feeding it with 240/120. Note also that there are fuses on the "neutral" bus.
Built in 1906 for The Seattle Electric Company the plant has the last operable large scale vertical steam turbine generators in the world.
Built in 1906 for The Seattle Electric Company the plant has the last operable large scale vertical steam turbine generators in the world.
#10
Georgetown PowerPlant Museum in Seattle. Look closely and you will see it was once a 120 volt only panel but the bus bar at the bottom has been cut to allow feeding it with 240/120. Note also that there are fuses on the "neutral" bus.
Built in 1906 for The Seattle Electric Company the plant has the last operable large scale vertical steam turbine generators in the world.
Built in 1906 for The Seattle Electric Company the plant has the last operable large scale vertical steam turbine generators in the world.
I see. I would've left it 120. I'm guessing this is only 30 circuts with the fused neutrals, then.
Why did they stop using vertical turbines? It seems they would be more efficient?
#11
Member
Join Date: Mar 2006
Location: Wet side of Washington state.
Posts: 16,321
Received 38 Upvotes
on
30 Posts
I'm probably in trouble for going way off topic...
The vertical turbines spin at 720 RPM synchronous speed. For any kind of efficiency a turbine has to spin at high speeds. Modern direct-coupled turbo-generators spin at 3600 RPM. General Electric only made the vertical turbo-generators for a short time, maybe ten years or so. They were HUGE for their output and the rotors of both the turbine and generator had to ride on a cushion of oil. That cushion took a lot of pressure to raise the rotors, upwards of 600 psi on the 3,000 kWh unit in this picture.
The grey painted area is the steam turbine with the generator above and the governor mechanism at top. If I remember correctly the governor is about 35 feet above the floor level. Melanie is about 5'2'' so that gives you some perspective of the size of this machine, and remember that it is only 3,000 kilowatts!
The vertical turbines spin at 720 RPM synchronous speed. For any kind of efficiency a turbine has to spin at high speeds. Modern direct-coupled turbo-generators spin at 3600 RPM. General Electric only made the vertical turbo-generators for a short time, maybe ten years or so. They were HUGE for their output and the rotors of both the turbine and generator had to ride on a cushion of oil. That cushion took a lot of pressure to raise the rotors, upwards of 600 psi on the 3,000 kWh unit in this picture.
The grey painted area is the steam turbine with the generator above and the governor mechanism at top. If I remember correctly the governor is about 35 feet above the floor level. Melanie is about 5'2'' so that gives you some perspective of the size of this machine, and remember that it is only 3,000 kilowatts!
#12
I'm probably in trouble for going way off topic...
The vertical turbines spin at 720 RPM synchronous speed. For any kind of efficiency a turbine has to spin at high speeds. Modern direct-coupled turbo-generators spin at 3600 RPM. General Electric only made the vertical turbo-generators for a short time, maybe ten years or so. They were HUGE for their output and the rotors of both the turbine and generator had to ride on a cushion of oil. That cushion took a lot of pressure to raise the rotors, upwards of 600 psi on the 3,000 kWh unit in this picture
The grey painted area is the steam turbine with the generator above and the governor mechanism at top. If I remember correctly the governor is about 35 feet above the floor level. Melanie is about 5'2'' so that gives you some perspective of the size of this machine, and remember that it is only 3,000 kilowatts!
The grey painted area is the steam turbine with the generator above and the governor mechanism at top. If I remember correctly the governor is about 35 feet above the floor level. Melanie is about 5'2'' so that gives you some perspective of the size of this machine, and remember that it is only 3,000 kilowatts!