Scott H Campbell
Member
Where is it stated in the NEC that vibration pads are required for the mounting of transformers?
Transformer Pads
- Thread starter Scott H Campbell
- Start date
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Scott H Campbell
Member
Why do we install them? A building code maybe?
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
I have installed them in lab buildings, when the lab planner gave strict vibration limits, and when the structural engineer said they were needed in order to meet the vibration limits. But I don't believe this is a code issue (not even a building code).
- Location
- Logan, Utah
I agree with Charlie and Roger, not a code requirement.
I think it is more of a customer convenience thing. The isolation pads can help limit the noise from a transformer.
Chris
I think it is more of a customer convenience thing. The isolation pads can help limit the noise from a transformer.
Chris
renosteinke
Senior Member
- Location
- NE Arkansas
The use of such pads, as well as the use of 'flex' for connecting the conduit, is a trade practice and nothing more. It is documented in NECA workmanship standards.
That said, many transformers already have vibration isolation pads built into them; typically there are some bolts inside that need to be loosened as part of the installation. In that instance, you could argue that manufacturer instructions required you to loosen them- even though the NEC itself has no requirement for isolating the transformer.
That said, many transformers already have vibration isolation pads built into them; typically there are some bolts inside that need to be loosened as part of the installation. In that instance, you could argue that manufacturer instructions required you to loosen them- even though the NEC itself has no requirement for isolating the transformer.
- Location
- Massachusetts
I agree with the others and will add that contract specifications often require isolator pads for transformers.
We did an office building where all transformers where required to be trapeze mounted with each threaded rod having vibration isolators and another set of isolators between the transformer feet and the uni-strut rack.
We did an office building where all transformers where required to be trapeze mounted with each threaded rod having vibration isolators and another set of isolators between the transformer feet and the uni-strut rack.
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