11/02/2021
PROPOSAL FOR THE INSTALLATION OF AN AUTOMATIC CHANGEOVER SWITCH
We are pleased to introduce to you one of our product which can be of a very good use to you.
WHO WE ARE
Davstel Global services limited, an indigenous electrical and electronic engineering company with RC 1294172 specialized in electrical and electronics designs, automation, production and service provider. We are passionate about bringing engineering to your doorsteps, proffering solutions to all your engineering challenges, designing, building and installation of power control panels and equipment, bringing indigenous power supply engineering products and services to an international standard, eradicating joblessness by empowering our youths and the unemployed to be entrepreneurs and self-reliant through trainings, home automation , enhancing the security system of the country from the grassroots through the design of security alarms like intruder alarms and burglar alarms and digital image counters all at affordable prices.
WHAT WE HAVE FOR YOU
We want to introduce to you our automatic change over switch.
HOW DOES IT WORK?
An automatic changeover switch is a device that switches automatically from supply authority to generator and vice versa, Optionally, It can accommodate both supply authority and the generator at the standby at the same time, but the supply authority will be the one supplied to the load. If eventually there is power interruption, it will switch automatically to the generator that is on standby, when power is been restored, it will automatically switch back to supply authority.
Option 2, when there is power interruption and the generator is been put in operation, and power is restored by supply authority, the device will switch back to supply authority sound an alarm them switch off the generator.
If the generator is the key starting type generator, as soon as the supply authority is been interrupted, the device will switch on the generator.
WHAT IF I AM NOT AT HOME AND THERE IS POWER INTERRUPTION AND DON’T NEED THE GENERATOR TO WORK?
Provision has been made for situations where people don’t want the generator to come on when there is power interruption.
Option 1;
We can reconfigure the device from putting off the generator. Meaning that as soon as there is power supply, the generator will be on standby, but the alarm from the device will sound to notify that there is power restoration.
Option 2;
A switch will be incorporated in the system to manually control the switching of the generator when there is power outage. The switch can be turned off at the close of business every day.
AVAILABLE AMPERAGES
We have the device available at the following amperages
20 A.
35 A.
65 A.
100 A.
LOAD CALCULATION FOR CHANGEOVER SELECTION
The table below will assist in calculating the total load for selecting the size of the changeover switch that is required. The calculations had been made to their extreme cases.
ITEM
WATTAGE
CURRENT (A)
Television
128
0.6
Laptop
19
0.1
Ceiling fan
60
0.2
Ox fan
128
0.6
Standing fan
30
0.1
Pumping machine 2h.p
1500
6.5
Air conditioner 2hp
1500
6.5
Air conditioner 1.5h.p
1000
4.3
Air conditioner 1h.p
745
3.2
Home theater
110
0.5
Washing machine
450
2.0
go TV
1.5
Pressing iron
1000
4.3
Electric cooker
1000
4.3
Amplifier
3000
13.0
Mixer
3500
15.0
Deep freezer
3.0
Fridge
1.5
100 watts bulb
100
0.4
60 watts bulb
60
0.3
The table above will serve as a guard in calculating the total current consumption in a home or an organization.
The total load current must not be more than the rated current of the changeover switch. For example in a home where fan, one air conditioner and four 100w bulbs is being used, the total load current will be
Fan 0.2
Air conditioner 4.5
4 100watts bulb 4X0.5 2.0
Total 6.7
The total load current is 6.7amps. So, a 10amps changeover switch will be suitable..
OUR PRODUCTS
Our automatic changeover is at affordable prices and come with a one year warranty when there is no physical damage to the device. Should the device create any technical problem within its warranty period, it will be replaced with a new one.
The prices are;
20 A = N15, 000.
35 A = N40, 000.
65 A = N70, 000.
100 A = N110, 000.
OUR OTHER PRODUCTS
Water level indicator with alarm and automatic switch
Image sensing switches.
Digital image counters.
Dark and light activated switches.
Inverters.
Battery chargers.
Welding machines, and general home automations.
OUR SERVICES INCLUDE
Industrial and domestic electrical wiring.
Installation of electrical machines and equipment.
Installation and commissioning of electrical panels.
CONTACT US
Davstel global services limited, 5, Olanrewaju Avenue, Ishasi road. Akute, Ogun state.
Contact lines: 08063105942, 08063623275.
E-mail us at [email protected]. Or visit us at www.davstelglobal.com
