Oil-Immersed Transformer vs. Dry-Type Transformer: Fire Resistance Rating

1. Oil-Immersed Transformer

Insulation Medium: Transformer oil (flammable liquid)

Fire Resistance Rating: No fire resistance rating; flammable/combustible equipment

Fire Protection Requirements:

* Must have an oil containment basin, oil drainage pit, and fire sand.

* Must maintain fire separation distance.

* Strictly prohibited from direct use in underground or densely populated indoor areas.

* Summary: Not fireproof; poses a risk of combustion.

2. Dry-Type Epoxy Cast Transformer

* Insulation Medium: Epoxy resin (flame-retardant, self-extinguishing)

* Fire Resistance Rating: Class F or Class H (heat-resistant)

* Combustion Performance: GB Standard: Flame-retardant, self-extinguishing, non-combustible, no open flame spread

* Internationally Recognized Markings:

* UL Certification: Class F1 / E2

* IEC Standard: Fire-safe type

* Summary: Truly fireproof, explosion-proof, and flame-retardant; suitable for indoor, underground, and densely populated areas. **Super Simple Memory (for direct communication with foreign trade/customers)**

Oil-immersed: Not fireproof, flammable; for outdoor use only.

Dry type: flame-retardant, self-extinguishing, fireproof and explosion-proof, for indoor/densely populated areas.