xfmr mounting
- Thread starter Mike01
- Start date
- Status
- Location
- Massachusetts
engy said:
Not generally.
The ability to go up to the next standard size cb is granted by 240.4(B) but that section excludes doing that with circuits that supply multiple receptacles.
If all those feed is lighting then I guess you could. :smile:
Agree..Isolators??
Agree..Isolators??
I guess the question was more about the vibration isolators someone indicated that the xfmrs already have isolators any by adding isolators to isolators it can create problems in the transformer? We find it necessary due to the reduced size of electrical rooms being squeezed down every day by designers besides the fact the always want to put the electrical room on an outside wall adjacent to the stair and or elevator not to mention they do not even want to stack the closets making it harder to install I would think (more conduit / offsets / fittings / wire) the detail developed indicates a unistrut rack bolted to a equipment pad (4?) with 12? clearance between transformers and maintaining the recommend clearances and the second xfmr. mounted to vibration isolators (the original question), to help resolve the heat problem we specify 80?C rise transformers with 220? insulation depending on the situation and the ventilation in the space I agree stacking may not always be the best option due to heat.
Agree..Isolators??
I guess the question was more about the vibration isolators someone indicated that the xfmrs already have isolators any by adding isolators to isolators it can create problems in the transformer? We find it necessary due to the reduced size of electrical rooms being squeezed down every day by designers besides the fact the always want to put the electrical room on an outside wall adjacent to the stair and or elevator not to mention they do not even want to stack the closets making it harder to install I would think (more conduit / offsets / fittings / wire) the detail developed indicates a unistrut rack bolted to a equipment pad (4?) with 12? clearance between transformers and maintaining the recommend clearances and the second xfmr. mounted to vibration isolators (the original question), to help resolve the heat problem we specify 80?C rise transformers with 220? insulation depending on the situation and the ventilation in the space I agree stacking may not always be the best option due to heat.
- Location
- Massachusetts
I also agree with Don.
We have done jobs that we hung the transformers on threaded rods. The specs called for vibration isolators on each threaded rod like these
and under the transformer itself and of course the factory ones where still inside the transformer.
Sometimes that just want to make sure that the hum is not transfered to the structure.
We have done jobs that we hung the transformers on threaded rods. The specs called for vibration isolators on each threaded rod like these
and under the transformer itself and of course the factory ones where still inside the transformer.
Sometimes that just want to make sure that the hum is not transfered to the structure.
masterinbama
Senior Member
- Location
- Huntsville Alabama
would that be a "Dinah Mo Hum"?
Pierre C Belarge
Senior Member
- Location
- Westchester County, New York
engy said:
Lighting...they are 10 AWG.
Steve,
Sorry for the late answer.
The information is standard for a dry type distribution transformer.
What it boils down to not let the air circulating to the transformer not to exceed 30-40degC ambient. It the transformer below raises that ambient temperature above that avrage ambient the top transformer should be derated to reduce its load.
Dave
Sorry for the late answer.
The information is standard for a dry type distribution transformer.
What it boils down to not let the air circulating to the transformer not to exceed 30-40degC ambient. It the transformer below raises that ambient temperature above that avrage ambient the top transformer should be derated to reduce its load.
Dave
- Status