A client has asked us to provide cable sizing calculations including voltage drop, short circuit rating, source impedance, circuit impedance and fault current of a ring main we have installed to ensure that our 2.5mm ring is suitable for the application.
Cable size 2.5mm
System voltage 254v...
bazastan
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calculations
electricians' talk
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main
ring
ring main
My ex-Next-Door-Neighbour has asked me about changing a shower at his new house.
Now I can't do it, (I'm not a scheme member) as it's not a like for like, he wants an uprated one.
But I told him previously he would be looking at replacing the 6mmsq Twin+cpc with 10mmsq if he wanted to uprate...
hi guys i did my 17th edition in 2008 and ive not done much in the trade since then ide be most gratfull if someone would please check my calculations
1 cooker hob rated at 5.7 kw
1 oven rated at 4.8 kw
so total is 10.5 kw / by 230v gives me 45 amps
after doing the diversity calculation...
I have been asked to calculate the size of HV transformer needed for a resort of 66 small 1 bed flats, they will be 2nd homes in the sun.
Each room has a maximum load of 50Amps
66 rooms X 50 Amps = 3,300 Amps
Not everyone will use every electrical appliance all the time, so we can reduce...
santidreamer
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aus
calculations
calibri
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lights
mains
seems
thank
water
Hi All
Is there a calculation for working out an unknown resistance on a 3 Phase Motor ?
The rating plate has 15kW / 29 amps . Trying to remember from my collage days but it has been a while.
Regards
Tailspin
:confused:
TailSpin
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3 phase
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canada
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wind
Hi
Was wandering if someone could help, I'm a first year level 2 student and we have just started calculations and I'm stuck on a couple:
1. Calculate the thickness of an aluminium busbar 60mm by 12m long which has a resistance of .000946 ohms (given that aluminum has a resistivity of 2.84...
hello,
this is going to be one of those qestions when i hear the answer it will come back to me, but at the moment its not!
when you mesure the end the end resistance of a ring main there is a calculation to work out the length of the circuit can someone enlighten me with this formular...
Afternoon all.
Re-doing my calculations for a hot tub supply after client upgraded the specs.
Details are: Hot tub rated at 16A. Supplier advises to use Type C breaker to handle inrush when pump starts. 26m from CU to Hot tub via rotary isolator switch.
I was proposing to use a 20A Type C...
Ive changed a CU for my assessment and rewired the upstairs lights due to no cpc,
will the assessor want to see calculations for cable size and voltage drop for rewiring the lights?
and will he want max demand/diversity calculations for the CU
and on the inspections, what happens if a box...
liam b
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assessment
aus
calculations
change
electricians' talk
lights
Hi All,
Ok here goes - R1+R2 calculations.
Using 2.5 T/E cable the calculation to find R2 is divide by 1.67 (or something similar).
Is there a calculation for using 1.5 T/e (1.0mm cpc). 4mm T/E, 6mm T/E etc etc ???????????????:confused:
Hi everyone, Ive got to install a sub main for a large bugalow. The supply is in the garage and the 2 nd mains board is approx 40 meters away. I was going to use 16mm t + e, 1 meter in trunking then the rest will be in the loft clipped high up away from the insualtion. ( so no RCD) It will be...
Hi All,
I would be very gratefull if anyone can clarify the correct method to calculate correct rating of RCDs, as I have read numerous threads which seem to differ.
I have just completed my Level 2 C&G 2330 and understand the cable calcs, but haven't asked my tutor this question yet. Here's...
Hi guys,
does anybody have a quick or easier way of working lout volt drop or cable calculations??
Basically, a way of working out if cable size and length is suitable for design?
I am always looking in OSG and BS7671, so wondered if any easier way.
Thanks guys and speak soon.
Sav
:)
Sav
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aus
cable
cable calculationscalculations
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Hi,
does anybody have a quick or easier way to work out volt drop and cable selection calclations ??
I always refer to the BS7671 and OSG, but wondered if anyone had an easier way to work these out.
Cheers guys and speak soon
Sav
:)
Sav
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aus
cable
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center
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electricians' talk
volt
volt drop
voltage
volts
Hi, im struggling on some formulas at the mo, wondered if any one could help?
vp/vs=np/ns=is/ip
vp=230v
vs=12v
np=800
ns=?
ns=npvs=800x12=42
vp 230
how do i find the Is and Ip?
Thanks for ur help
Say you wanted to power a shed office, or somethign similar, and lets say it's up the end a garden.
Would you split at the meter to an isolator switch or a breaker then swa all the way up to a new CU.
Then for earth would you have to use an earth spike instead of the earth down the armoured...
adam.h
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aus
building
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circuit
earth
electricians' talk
out
power
power to
spike
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