About: http://webisa.webdatacommons.org/13022941

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Manufacturing standard for transformers is usually either +/- 5% or +/- 10% as far as turns and other things go so its probably the tolerance of the PT there as well.
http://www.w3.org/ns/prov#wasQuotedFrom	ultimate-guitar.com