Issue:
What standards of testing are used for Sound levels in SQ D Transformers?
Product Line:
LV Transformers
Environment:
Applies to Low Voltage Transformers by SquareD/Schneider Electric
Cause:
Transformer noise level during operation
Resolution:
SquareD/Schneider Electric tests Low Voltage Dry Type Transformers per NEMA ST-20 Section 4.2.10 (1992).
Following are some paraphrased excerpts from that standard:
- Ambient Noise must be 5 decibels below testing value (Preferred 10 decibels) Correction factor used for 5 to 10 dB below
- No acoustically reflecting surface, other than the floor, within 10 feet
- Equipment must be in accordance with ANSI S1.4, 1983
- Average sound is the arithmetic mean of the sound readings (Minus correction factor)
- Five major sound producing surfaces
- ~ 1 foot from each surface @ 1/2 height (less than 8 feet tall)
For a complete print of the NEMA ST20 Standard, you must purchase the standard from NEMA as it is copyrighted material.
What standards of testing are used for Sound levels in SQ D Transformers?
Product Line:
LV Transformers
Environment:
Applies to Low Voltage Transformers by SquareD/Schneider Electric
Cause:
Transformer noise level during operation
Resolution:
SquareD/Schneider Electric tests Low Voltage Dry Type Transformers per NEMA ST-20 Section 4.2.10 (1992).
Following are some paraphrased excerpts from that standard:
- Ambient Noise must be 5 decibels below testing value (Preferred 10 decibels) Correction factor used for 5 to 10 dB below
- No acoustically reflecting surface, other than the floor, within 10 feet
- Equipment must be in accordance with ANSI S1.4, 1983
- Average sound is the arithmetic mean of the sound readings (Minus correction factor)
- Five major sound producing surfaces
- ~ 1 foot from each surface @ 1/2 height (less than 8 feet tall)
For a complete print of the NEMA ST20 Standard, you must purchase the standard from NEMA as it is copyrighted material.
Released for: Schneider Electric Canada
Need help?
Product Selector
Quickly and easily find the right products and accessories for your applications.
Get a Quote
Start your sales inquiry online and en expert will connect with you.
Where to buy?
Easily find the nearest Schneider Electric distributor in your location.
Help Center
Find support resources for all your needs, in one place.
