The voltage drop is taken in to account for the planned 1A max load.@pc1966 Are you purposefully not taking volt drop into account? If so, may I ask please what your reasoning is behind this?
Discuss What type and size of cable for a long underground run in the UK Electrical Forum area at ElectriciansForums.net
The voltage drop is taken in to account for the planned 1A max load.@pc1966 Are you purposefully not taking volt drop into account? If so, may I ask please what your reasoning is behind this?
I see. Thanks for that.The voltage drop is taken in to account for the planned 1A max load.
It is certainly something to discuss with the customer to see if they do expect anything else to be added, or if it really is only that.Having said that, if going to the trouble and expense of digging trenches and installing ducting, it might be more sensible to design for a higher design current to allow for other equipment to be used.
Yes, it is indeed very odd.it would seem a little odd to provide the network connections but no power?
CSA \ Volts | 230 | 400 | 480 | 630 | 800 | £/m | For 600m |
2.5 | 1 | 3.0 | 4.4 | 7.5 | 12.1 | £0.95 | £570.00 |
4 | 1.6 | 4.8 | 7.0 | 12.0 | 19.4 | £1.25 | £750.00 |
6 | 2.4 | 7.3 | 10.5 | 18.0 | 29.0 | £1.80 | £1,080.00 |
10 | 4 | 12.1 | 17.4 | 30.0 | 48.4 | £2.42 | £1,452.00 |
16 | 6.4 | 19.4 | 27.9 | 48.0 | 77.4 | £3.73 | £2,238.00 |
25 | 10 | 30.2 | 43.6 | 75.0 | 121.0 | £5.75 | £3,450.00 |
CSA \ Volts | 230 | 400 | 460 | 630 | 800 | £/m | For 600m |
2.5 | 1 | 3.0 | 4.0 | 7.5 | 12.1 | £0.95 | £570.00 |
4 | 1.6 | 4.8 | 6.4 | 12.0 | 19.4 | £1.25 | £750.00 |
6 | 2.4 | 7.3 | 9.6 | 18.0 | 29.0 | £1.80 | £1,080.00 |
10 | 4 | 12.1 | 16.0 | 30.0 | 48.4 | £2.42 | £1,452.00 |
16 | 6.4 | 19.4 | 25.6 | 48.0 | 77.4 | £3.73 | £2,238.00 |
25 | 10 | 30.2 | 40.0 | 75.0 | 121.0 | £5.75 | £3,450.00 |
It is a very good suggestion. In fact, many IT systems would be planned to include a UPS and usually they will 'condition' the normal input range to come out at a since stable 230V.If all you need to power is some fixed equipment in a cabinet, rather than worrying about a 5% or whatever voltage drop, can you perhaps not just install a power conditioner / voltage stablizer?
These seem to exist from quite small loads e.g. 3A to 10A or 20A at quite reasonable costs £100 to £300. A typical input range might be 140-260V, with a 230V output +/- 6%. You might even find one that operates from 100V or less up to 260V or more, a bit like many AC adapters that work off both 110V and 230V.
Here would be a reasonable case for a departure from BS7671 as it has no safety implications (high cable drop not related to exceeding the CCC) provided the design of RCD/OCPD is such that disconnection under fault conditions is still met.Obviously this is not going to be some BS7671-compliant supply, but perhaps you treat the whole cabinet & very long supply cable as a fixed load from wherever it is supplied from?
But feel free to tell me this is a daft idea!
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