Sec. 227.4. Modification of approved devices

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(a) Permission to use an approved device is effective only for those types which are of the same design and construction as the type approved. If the manufacturer of an approved device changes its materials, construction, or design in a manner that may affect its operation, accuracy or safety, the sponsoring utility or the utility intending to use the modified device shall notify the commission staff, specifying the changes.
(b) The commission will evaluate the effects of the modification and determine whether the device remains acceptable, and if so, whether the existing approval is adequate or should be amended, and will so notify the utility.

                    
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