Current through Register Vol. 54, No. 45, November 9, 2024
Section 39.131 - Current transformers secondary circuits(a) Secondary circuits of current transformers including constant current and instrument transformers, except those supplying relays only, or those having their primary circuits always disconnected before the secondary circuits are worked on, shall be provided with means of short circuiting them which may be readily connected while the primary is energized and which are so arranged as to permit the removal of any instrument or other device from such circuits without opening the circuits.(b) If primaries are above 7,500 volts, secondary circuits, unless otherwise adequately protected from injury or contact of persons, shall be permanently grounded conduit. This section cited in 34 Pa. Code § 39.201 (relating to storage batteries, transformers and lightning arresters).