Rot
7.3.4. Smoldering - combustion without light emission, usually recognizable by the appearance of smoke
Source: "Rules for the Installation of Electrical Equipment (PUE). Sixth Edition" (approved by the Main Technical Administration, State Energy Inspectorate of the Ministry of Energy of the USSR on October 5, 1979) (revision dated June 20, 2003)
Smoldering combustion: process of burning combustible material in the absence of visually observable flame
Source: "GOST R 54081-2010 (IEC 60721-2-8:1994). National Standard of the Russian Federation. Effects of natural external conditions on technical products. Fire"
(approved and introduced into effect by Order of Rosstandart dated November 30, 2010 No. 736-st)