Main Switch Board (MSB) / Sub-Main Switchboard (SMSB)

Standard Compliance to

MEW Regulations R1
IEC 439 / BS 5486	Panel Construction
BS 159	Busbars Connections
IEC 947 – 2	Circuit Breakers
BS 88/ IEC	Fuses
BS 142/IEC	Protective Relays
BS 3938/IEC 185	Current Transformers
IEC 51/BS 89	Metering and other relevant standards

1. Distribution System : 3Ph & N System 415/240V, 50HZ

2. Fault Level Rating : 15KA / 15KA / 35KA / 50KA

3. Busbars : Electrolytic Tinned copper with 99.9% purity.

Color-marked for Phase Identification

Capacity	RYB & N upto 630A (800A & above available on request)
	E: 50% of phase busbar
Supports	Moulded DMC fiber-glass Insulating supports with high resistance & Reduced flammability
	Working Temp – 160˚C
	Working Voltage – 660V

4. Enclosure:

Construction	Box / Cubicle, Non Cellular, Totally Enclosed, Front Accessible.
Material	Steel Sheet
Treatment	Electro Galvanized / Zinc Coated.
Gauge	1.5mm / 2.0mm
Painting	Powder Coating matt Polyster, RAL 7032
IP Protection	IP 52 Indoor Installation
	IP 54 Outdoor Installations

5. Assembly:

Materials used are capable of withstanding the mechanical, electrical, and thermal
stresses as well as the effect of humidity which are likely encountered in normal
service.