afternoon chaps
estimating for a job for a communal area and 3 flats (3stories)
only been emailed the drawings by the contractor so far so no site visit yet
-assume there is a 3ph supply
was thinking to have 1x single phase DB local to the income- to cover the communal lighting and small power.
Then also local to the income to have 3x 100amp switched isolators (flats are to have 1x electric towel rail, 3x panel heaters+ immersion)
......local to the main income and then have my sub main SWA's go off to the flats
I am basing my estimate on 1x 100amp switched isolator+ 25mm SWA + consumer unit inside flat.
for voltdrops calcs- do I just need to calc for the swa meterage between the isolator and the flat c/u
1.9 X 100amp X 25meters /1000 = 4.75volts -which is within 3% and 5%
-leading nicely to my 2nd question!!- what does a sub-main have to be within 3 or 5% as it will of course be doing lighting and power with flat.
cheers for any advise.
estimating for a job for a communal area and 3 flats (3stories)
only been emailed the drawings by the contractor so far so no site visit yet
-assume there is a 3ph supply
was thinking to have 1x single phase DB local to the income- to cover the communal lighting and small power.
Then also local to the income to have 3x 100amp switched isolators (flats are to have 1x electric towel rail, 3x panel heaters+ immersion)
......local to the main income and then have my sub main SWA's go off to the flats
I am basing my estimate on 1x 100amp switched isolator+ 25mm SWA + consumer unit inside flat.
for voltdrops calcs- do I just need to calc for the swa meterage between the isolator and the flat c/u
1.9 X 100amp X 25meters /1000 = 4.75volts -which is within 3% and 5%
-leading nicely to my 2nd question!!- what does a sub-main have to be within 3 or 5% as it will of course be doing lighting and power with flat.
cheers for any advise.