Er bod y mwyafrif o danau mewn anheddau'n deillio o offer domestig, fe'u hachosir yn bennaf gan ymddygiadau anniogel megis rhywbeth yn tarfu ar berson sy'n coginio neu osod gwrthrychu'n rhy agos at y gwres.  Lleiafrif bach yn unig a achosir gan offer trydanol anniogel eu hunain. Mae'r Gwasanaethau Tân ac Achub yng Nghymru felly'n canolbwyntio llawer o'u gweithgarwch atal ar godi ymwybyddiaeth o risgiau tân a newid ymddygiad pobl.  Mae hyn wedi cyfrannu'n sylweddol at y gostyngiad mewn tanau damweiniol mewn cartrefi dros y 15 mlynedd ddiwethaf.
Although most dwelling fires originate in domestic appliances, they are largely caused by unsafe behaviours such as distraction while cooking or placing objects too close to heat.  Only a small and declining minority are caused by unsafe electrical appliances themselves.   The Fire and Rescue Services in Wales therefore focus much of their prevention activity on raising awareness of fire risks and changing people’s behaviours.  This has contributed significantly to the overall decline in accidental dwelling fires over the last 15 years.