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зануление n stresses
gen.	neutral wire earthing (Alexander Demidov); bootleg ground (zhvir)
astronaut.	grounding; grounding of the neutral wire
automat.	neutral grounding; nulling; neutral earthing (Alexander Demidov)
cables	grounded neutral; protective multiple earthing (ssn)
el.	connection to the neutral wire; neutralizing
el., Makarov.	earthing of the neutral wire
electr.eng.	neutralling (ГОСТ 12.1.030-81 Steblyanskiy)
Gruzovik, electric.	neutralizing
O&G, casp.	equi-potential earthing (Yeldar Azanbayev)
telecom.	neutral connection (oleg.vigodsky)

зануление: 4 phrases in 3 subjects

Astronautics	1
Electrical engineering	2
Oil / petroleum	1