These motors can be used in Zone 1 and Zone 2 areas as per IS:5572 and IS:15142. Flame proof motors are offered suitable for Gas Gr.I, IIA and IIB only. BBL flame proof motors are certified and approved for use in Zone 21 & Zone 22 ( Presence of combustible and ignitable dust) as per IS : 15142. Motors are also offered in multi speed and non standard outputs / voltages / frequencies.

Salient features of TEFC Standard Motors :

Type of constructions :
❖ Standard Motors are designed for foot mounting (B3). These are also suitable for B6, B7, B8, V5and V6 mounting without any change.
❖ Motors can be supplied in flange mounting (B5). These motors will also be suitable for V1 and V3 mounting without any change.
❖ The flame proof motors manufactured by BBL are suitable for Temperature Class T1 to T4 as per IS 6381.

Main Characteristics :
❖ Sturdy housing which prevents an internal explosion from spreading to the outside and resists the explosion pressure
❖ Robust bearing shields and caps bolted to the frame in such a manner that the gaps remain unaffected in the event of an internal explosion
❖ Screen on air intake with a mesh size not exceeding 8 mm
❖ External earth terminals
❖ Protective earth conductor terminal in the terminal box
❖ "Ex 'd'" mark on the motor
❖ CIMFR certificate No., PESO and DGFASLI certificate No. and ISI Licence mark on the name plate
❖ Special varnishing and painting treatment to resist highly corrosive atmosphere

Enclosure Design :
❖ The frame, end shields, terminal boxes and bearing covers of all motors are made of grey cast iron. The motors are so designed that the frame temperature will remain below the ignition temperature of the gas-air mixture

Insulation :
❖ All motors of standard design are provided with Class F insulation with temperature rise limited to Class`B'

Cooling :
All motors have bi-directional cast iron or fabricated fans

Terminal Box:
❖ Flame Proof Motors have terminal box on the top as standard. Side terminal box can be offered on request for frame sizes 132M and above

Cable Entries :
Motors for Coal mining application (Gas Group I ) are provided with cable entries with compound filling sealing boxes suitable for paper insulated lead covered double wired armoured (PILCDWA) PVC cables. Cable entries with flameproof cable glands can also be provided to suit PVC armoured cables. (For application in hazardous area Gas groups IIA and IIB only). Motors in all frame sizes can be supplied with termination suitable for plug and socket arrangement, against enquiry A cable sealing box is mandatory for all motors for use for Gas Group I (Coal Mines) and Gas Group II A & II B(Oil Mines)