Otcepi su najčešće grananja na el. vodovima, kablovima (en. branch joints ili T-joints), a u ovom slučaju se radi o izvodima (otcepima, grananju) na namotajima sekundara transformatora, slično kao što je na slici:


"UNIVERZITET U BEOGRADU - ELEKTROTEHNIČKI FAKULTET
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Transformator može biti regulacioni (sa otcepima) pa se tako može podešavati napon.
...
Slika br.13.2.1 Principijelna električna šema pogona diodne lokomotive
Kontrola vučne sile se reguliše nedisipativno i to preko graduatora biranjem otcepa i kao posledica takve konstrukcije javlja se diskontinualna regulacija vučne sile."
( http://vozila.etf.bg.ac.yu/evuc.pdf )


"IEEE - Voltage flicker calculations for single-phase AC railroad electrification systems
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...where:. Z, is Total impedance of the utility system at. Bus. B. and the transmission line impedance from Bus. B to the traction power transformer tapping ..."
( http://ieeexplore.ieee.org/Xplore/login.jsp?url=/iel5/8566/2... )


"The J & P Transformer Book (By Martin J. Heathcote, David Peter Franklin)
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The simplest arrangement is that in which the power transformer tappings are terminated just below oil level and there changed manually by means of bolted ..."
( http://books.google.com/books?id=qjR6kTmZvmQC&pg=PA205&lpg=P... )


Institut za standardizaciju Srbije
TABLE FOR LIST OF TECHNICAL TERMS USED IN TRANSLATED STANDARD
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tapping - grananje (EN 60998, 3.3)
coils with tappings - navoji sa (regulacionim) izvodima (EN 60519-3, Clause 3.5. p. 11)