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I may have asked this question before but I forgot what was said and the problem has reered it's ugly head again.
I was doing some RFC testing the other day. Did my cross connecting but when I was doing the calcs I kept getting the wrong figure. It seemed I was not pressing = before dividing by...
hi all small formula issue can anyone help got the basics can add, multiply, ect copy columns, but need a multiple column (sum) entry.
a item £ sorted
b total £ sum of h-P (sorted) H-P x a = B all good
1-200 some headings but overall
so I need
H1 - H200 column H x A But for the...
Formula 1 votes against Halo in 2017 - http://www.skysports.com/f1/news/12433/10515016/formula-1-votes-against-halo-in-2017
Not as cool as the auroscreen or whatever the other option was. But that failed FIA tests apparently.
Hi I was give this calculation to do! First have I done it right? And is this the same as calculating parallel circuits?
In a 230V DB 7 different circuit give out an installation resistance test of 200, 200, 150,100,50, 25 and 2.
I came up with
RT = 1/200 + 1/200 +...
I have a question (still learning, passed 17th edition and part P, but I'm not yet registered).
If you use formula from On-Site Guide p.140 what the design current you put in the formula, to calculate max length of cable for 11.5V.
If 32amp then the maximum length of ring final...
In a bit of a pickle ,got niceic audit imminent ,and i have some exccesive readings from a 110v transformer backed up by 60898 type c 16amps mcb acording to BS7671 pg 61 41.6 max is 0.34 .can change to a type B to get max 0.69. these reading s are from another tester ,who...
HI, all let say....
i have connected load 20,000W = 20kW...
I calculate ampere from this formula p=vi(1.732)(0.8)
by the help of this formula i got my breaker size......
but i confuse that how would i get my generator size.......?
plz help me about that....
Just running through the "Photovoltaics in buildings guide - 2nd edition", as you do, and can't get my head around the string cable requirements.
p 16, 2.1.5 says:
"For a system of N parallel connected strings, with each formed of M series of connected modules, string cables are to...
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...
hi im struggling with volt drop , the circuit is 6mm 2core swa , run under ground , 220M long ,supplying a transformer charging batterys for a gate system rated at 5A.
Can anyone help me and give me the formula for the calculation? Thanks:confused:
Can anybody remember the formula for working out ring main cable sizes (Cable Capacities). I know we use 32amp MCB with 2 x 2.5mm² but its been so long I cant remember the formula that proves 2.5mm² is capable of carrying a ring main load.
Thank you in advance
Sorry if this has been...
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