Transformer

[hhsting]

I have two 75 kva transformers both floor mounted one existing and one new. Attached is what the diagram of how they are located. One in front of the other. Would the transformer require working space or maintenance space? Is this code compliant?

 

[infinity]

I don't see the existing one will have any access. I would hang the new one above the existing one.

 

[hhsting]

I don't see the existing one will have any access. I would hang the new one above the existing one.

Is access required by code? I dont see where?

 

[ActionDave]

I would hope they are meant to be installed back to back, not in front of each other.

 

[hhsting]

I would hope they are meant to be installed back to back, not in front of each other.

I dont see where code doesnt allow front to front install for transformers?

 

[Johnhall30]

Code says that any equipment requiring maintenence requires the working space.

 

[roger]

Does the bold outline indicate suspended?

 

[zbang]

Start with Article 110 part II.

 

[augie47]

I think you can make a case it would violate:
110.26 Spaces About Electrical Equipment. Access and working space shall be provided and maintained about all electrical equipment to permit ready and safe operation and maintenance of such equipment.
& it's certainly a poor plan especially where it would make sense to stack them as infinity suggests.

 

[roger]

I think we need to see the notes accompanying the symbols, why is one transformer drawn different than the other?

 

[Rock86]

I agree it is a poor design if it is intended for both transformers to be mounted like it described. I found this in an article and understand the debate with the posters question...
"An informal interpretation obtained from the National Fire Protection Association (NFPA), the authors of the National Electrical Code (NEC), states that whether a transformer is likely to require examination, adjustment, servicing, or maintenance while energized is based on whether an employer will permit an employee or contractor to work on the transformer while it is energized.
The informal interpretation further states that permission to waive working space requirements for transformers must be obtained from the Authority Having Jurisdiction (AHJ). Many AHJs will not base a safe installation on an employer’s electrical safety program, which could change over time. Therefore, most AHJs will require working space for transformers.
Because of the ambiguity of the NFPA’s informal interpretation and the overriding need to ensure the safety of electrical workers, providing transformers with the standard working space dimensions is recommended to ensure a fully compliant installation. If an installation cannot provide the required working space, AHJ approval to waive the working space requirements must be obtained before the installation is undertaken."
source: NEC Essentials for Architects

 

[infinity]

The question isn't whether or not it requires working space it's does it require accessibility after installation.

 

[lordofthisworld]

I have two 75 kva transformers both floor mounted one existing and one new. Attached is what the diagram of how they are located. One in front of the other. Would the transformer require working space or maintenance space? Is this code compliant?

Stack them, put the new one over the existing.