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In a 48V DC system you ground the positive to 0V so the live wire will be -48V.
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∙ 14y ago
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How do you wire -48v dc power and ground to earth?
always think of any supply system so : RED = MOST POSITIVE BLACK = MOST NEGATIVE in a telecom system the -48V supply is refferenced to ground and earth, so the supply wire is NEGATIVE, this means a DC supply most positive signal the RED wire, go to EARTH = ZERO, the BLACK wire is the MOST negative, so in this case it is -48V
Why is a rectifier needed for a GSM BTS?
This is bcoz we need -48V for Gsm BTS, -48 DC is used to control Fluctuation So the main function of this is 1) To convert AC to DC 2) To control overloading
What is cable size for 48V DC 30 A?
The correct size of cable depends on the length of the cable run, as well as the voltage and current. Another consideration is what voltage loss is acceptable ? Safest answer would be to use a cable sizing table or online tool: http://www.solar-wind.co.uk/cable-sizing-DC-cables.html Hope that helps. G.
Why -48v DC is used in telecom?
In earlier days of telephone networks, 48V DC was once found to be suitably high to be able to make telephone work on long telephone lines and still low enough not to cause serious danger if somebody touches the telephone wires. Telephone central offices (exchanges) so started using 48V DC. Even when newer automatic exhanges were setup, they were designed to make use of existing 48V battery sets and arrays which were available with telecom service providers. This legacy design practice has been continued and over many decades all new telecom devices have been designed to work with 48V. The positive grounded or -48V system is also from telephone history. The negative voltage on the line was better than positive to prevent electro-chemical reactions from destroying the copper cable quickly, if cables get wet Ans- It is because of cathodic protection. It reduces the sulphation on the battery terminals.
Why use -48V dc in bts?
-48 v is given to BTS because in this voltage Noise generation is minimum. Because two terminal comes out from the battery and through red color wire we ground the +ive terminal so that possibility of noise interference will get zero because noise occurs only in the +ive terminal that's why we use -ive voltage in the BTS.
How do you wire -48v dc power and ground to earth?
always think of any supply system so : RED = MOST POSITIVE BLACK = MOST NEGATIVE in a telecom system the -48V supply is refferenced to ground and earth, so the supply wire is NEGATIVE, this means a DC supply most positive signal the RED wire, go to EARTH = ZERO, the BLACK wire is the MOST negative, so in this case it is -48V
Why is a rectifier needed for a GSM BTS?
This is bcoz we need -48V for Gsm BTS, -48 DC is used to control Fluctuation So the main function of this is 1) To convert AC to DC 2) To control overloading
Why telecom power supply has 48V dc power supply?
because the termination and relays in side the telecoms penal needs for DC supply to continues the protection equipment and relay and purpose of telecoms
Can you convert ATX power supply to run off DC input 24v 48v or 120v?
Like to run on a DC powered machine? Probably the easiest and safest way would be to buy a standard power inverter.
How many volts does a bts uses?
By BTS, do you mean Base Transceiver Station? Such equipment can be found in cell phone towers. Usually a BTS runs on 48V DC.
Can you charge 48v batteries with a 36v output charger?
No.
What is cable size for 48V DC 30 A?
The correct size of cable depends on the length of the cable run, as well as the voltage and current. Another consideration is what voltage loss is acceptable ? Safest answer would be to use a cable sizing table or online tool: http://www.solar-wind.co.uk/cable-sizing-DC-cables.html Hope that helps. G.
Why won't my condenser mic work on logic pro?
condenser mics need 48V phantom power, make sure that the 48v is on, then check to see if the R is on and the I is on on your channel and see if they are wired to the master output.
Why you use 48V for sdh?
A 48V power source is used to power an SDH pump to allow for sufficient electricity to keep the motor moving at maximum efficiency. These pumps are used in a variety of agricultural and industrial applications.
Why the bts is given a power supply of -48v?
because in this voltage harmonics are not present
Is phantom power always 48v?
"Phantom Power" in use in the recording industry is ALWAYS 48V. Some types of mics use other types of power like T-power or an internal battery, but this is not "Phantom Power".
Why plus 48V not use in telecoms?
To avoid the corrosion of the copper conductors under the ground.
