Auxiliary equipment may only draw its energy from the feed line for the spring brake actuators under the condition that its operation, even in the event of damage to the energy source, cannot cause the energy reserve for the spring brake actuators to fall below a level from which one release of the spring brake actuators is possible.
Abiseade võib võtta energiat vedruakude ajamite toiteahelast tingimusel, et selle töötamine ka energiaallika rikke puhul ei saa põhjustada vedruakude ajamite energiavaru langust alla taset, mille puhul on võimalik ühekordne vedruakude ajamite vabanemine.