I am about to instal a new lighting circuit in an extension with vaulted ceilings. I have calculated the length to be about 100m, and have worked the voltage drop with 1.5mm cable to be 12.18 using the calculation of: 29(from table 6e2) x 4.2(design current) x 100(length) all divided by 1000. Is...
macloon
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aus
cable
circuit
circuits
lighting
table
voltagevoltagedrop
volts
in a gas power plant There are 2 main transformers ( st1 , st2 ) taking from the grid 380 kv and step down to 13.8 kv ,and then feeding the main bus which it is divided into 2 buses ( A Feed by st1 , B Feed by st2 ) between them bus tie
st1 = 380 kv/13.8 kv
st2= st1
Bus A feeding gas...
live11
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aus
avoid
calculate
compressor
gas
how to
roman
starting
times
voltagevoltagedrop
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Hi guys,
Recently installed a 12kW electric shower for a customer.
Customer has called me back because the lights dim quite noticeably every time he uses it.
Took some readings at the CU Main switch. Shower off = 248V, shower on = 236V, a voltage drop of around 12V (although still in...
puranah69
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aus
dimming
lighting
lights
shower
using
voltagevoltagedrop
volts
Hi All wonder if anyone can help just wondering how sorting out voltage drop works in practice the regs say that this can be worked out using the Zs or using diagrams. Any idea how this is done in practice?:6:
Hi
Could someone kindly put me in the right direction for voltage drop in cables.
I have the formula from OSG (mV/A/m) x lbxL divide 1000 but cant get my brain to kick in and piece everything together.
There is very little in 7671 unless im looking in the wrong part.
Do I require tables for the...
Hi
Just a quick one does anyone know were you can get those voltage drop kits ( like the one used on diy SOS about size of a consumer unit) and if so how much they are?
Also what's it roughly save the coustomer per year??
We've got a site where we're installing a 50kWp (3 phase) system on a barn and then feeding the main buildings 250m away.
I've just gone through the BRB, and allowing for both the operating temperature and load factor, I got results of 95mm2 Cu and 120mm2 Al - this seems a bit on the large...
The calculations for Voltage drop as described in the IEE Regulations book is shown below:
The actual voltage drop is given by:
mV x Ib x l
1000
=
7.3 x 37.4 x 24.5
1000
= 6.7 V (well below the maximum of 11.5V)
This voltage drop, whilst not causing the kiln to work unsafely...
eli
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across
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please
resistance
supply
voltagevoltagedrop
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I need to feed a new board 50m away.
Iv been doing clacs 16mm drops 7.2v over this distance. Is voltage drop to point of origin?
Does this mean im going to end up using 25mm?
Sorry if am being stupid,been there for hours and had info overload today :S
Hes got 2 water supplys in his house(not...
mattmoo1974
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aus
going
main
socket
sub main
supply
voltagevoltagedrop
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i have been asked to pv quote for a barn which is 100 meters away, there is a 16mm cable running down to the barn,
my question is according to the sma software the voltage drop is 3.74v the power loss is 63 Watts
is this ok, i know the dti says you should try and keep the voltage drop below...
Pre empting my 2382 and trying to calculate lb so as I can calculate voltage drop.
Circuit I have used for this is an upstairs lighting circuit, 1mm2 t&e 4 light points and length of approx 19m.
Cable installed to ref method C.
Getting myself a bit confused but this is what I think I...
Penance
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apply
aus
cable
calculating
diversity
round
voltagevoltagedrop
volts
Hi
I have been asked to provide power to a building at the foot of the customer's 30 metre garden (32A ring and 6A lighting circuits).
When I calculate the required cable size in terms of voltage drop, 6mm SWA is just over limits.
I am using 6.4 mV/A/m 36A Demand and 30 metre run...
Colonel Hathi
Thread
aus
cable
circuit
lighting
voltagevoltagedrop
volts
Morning,
Just a quick question?
In the OSG (2008) (page 44), it says that you can have 106 metres of 2.5 T&E with a 32A type B cb. Any ideas how they are working this out?
My understanding of vd on a ring is mvam x half of length x half of ib / 1000
So 18 x 53 x 16 / 1000 = 15.2 v??
I assume...
CRAIGNEWHAM
Thread
aus
chris
equation
london
ring
voltagevoltagedrop
volts
6.9 v for lighting
11.5 for a socket.
So my question is to calculate the size of a supply cable to a building that had lighting power heating for example. What figure would i use for voltage drop.
Is there a wxtra safe rule of thumb method ppl use?
I am adding a new Air handler panel to a building and its load is 5421KVA. How do I go about getting the the start up current when the phase voltage is 240V?
On obtaining the Start up current, now how do I calculate the voltage drop when the cable that I am thinking about using is the 35mm sq...
Anita
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across
cable
calculating
conductor
copper
insulated
phase
pvc
using
voltagevoltagedrop
volts
Hi, i am confused about how voltage drop is worked out and need an answer for the following please;
Work out cable size and cpc size you need when you have:
Cable length = 50 metres
Ib = 32Amps
to get a voltage drop that complies with regs i.e. below 5%(11.5 Volts).
It's wired in singles and...
ta-electrical
Thread
aus
cable
formula
guide
help
help please
please
value
values
voltagevoltagedrop
volts
Iv been calculation voltage drop. Could some see if what im doing is correct.
So from looking in the regs i have found that your aloud 6.9v voltage drop for lights and 11.5v for sockets etc. S i take it that i need to go buy the 6.9 v as i have lights???
Im intending on feeding a new board...
If you have a 50A 3 phase MCB, that's 50 per phase - when calculating voltage drop using the tables do you calculate using 50A or 150A?
ie 10mm cable carrying 50A 3 phase over 30m
VD=3.8x50x30 / 1000 = 5.7V
or
VD=3.8x150x30 / 1000 = 17.1V
I think it has to be the first but am a bit mixed...
VOLTAGE DROP CALCULATION FORMAT
hi my friends,
is anybody have voltage drop calculation format?
AND THERE BEEN SOME CHANGING OF OPINIONS AND ADVICES AS FOLLOW
1ST REPLY
Shabu there's a few ways of calculating volt drop, the vast majority provide you with an "average" assuming the load is...
hi guys
trying to get the right table in the BS7671 book and the On site guide, regarding wroking out my CCC and VD....
I worked out my design for my shed, its going in twin and earth flat, in round conduit. Looking in the BS7671 it looks to me that is a Method B.
There isnt a method b...
danny124
Thread
aus
cable
circuit
current
issue
method
voltagevoltagedrop
volts
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