Sanddancer Posted June 6, 2019 Author Report Share Posted June 6, 2019 On 04/06/2019 at 09:08, Alan de Enfield said: I wonder if its a fat-boat or a thin-boat and is it 'in' London ? Way your mouth out lol Link to comment Share on other sites More sharing options...
Sanddancer Posted June 15, 2019 Author Report Share Posted June 15, 2019 On 02/06/2019 at 12:16, Alan de Enfield said: Whatever size is suitable for the current output of the charger - we cannot answer directly as we don't know if you have a 4 amp charger or a 120 amp charger. A properly crafted question will result in informative answers. Link to comment Share on other sites More sharing options...
Alan de Enfield Posted June 15, 2019 Report Share Posted June 15, 2019 (edited) 11 minutes ago, Sanddancer said: OK - and the distance from the charger to the batteries s ? (quote either the simple distance, or allow for 2x the distance as the leccy has to go in a circuit) 'Normally' something like 3 to 4% volt drop is considered acceptable. If your batteries are 3mts away from the charger, then you will need to use 10mm squared (not 10mm diameter) cable. This will give you a volt drop of 0.46 volts and a 3.83% volt drop. For comparison using 4mm squared cable would give a volt drop of 1.16 volts and a 9.7% volt drop. Edited June 15, 2019 by Alan de Enfield Link to comment Share on other sites More sharing options...
Sanddancer Posted June 15, 2019 Author Report Share Posted June 15, 2019 54 minutes ago, Sanddancer said: On 02/06/2019 at 12:16, Alan de Enfield said: Whatever size is suitable for the current output of the charger - we cannot answer directly as we don't know if you have a 4 amp charger or a 120 amp charger. A properly crafted question will result in informative answers. It's about 4 feet Link to comment Share on other sites More sharing options...
Alan de Enfield Posted June 15, 2019 Report Share Posted June 15, 2019 (edited) 6 minutes ago, Sanddancer said: It's about 4 feet Ok taking it as 2 metres (to allow for routing and a bit of slack) you need 8mm squared (not 8mm diameter) That gives you 0.36 volt drop (or 3%) This one would be ideal. https://www.12voltplanet.co.uk/63-amp-single-core-thin-wall-auto-cable.html Edited June 15, 2019 by Alan de Enfield Link to comment Share on other sites More sharing options...
Murflynn Posted June 15, 2019 Report Share Posted June 15, 2019 pedant alert - '4mm squared' is actually 16 square mm. If you want to be unambiguous it would be helpful to get the 'dimensions' right, in this case I assume you mean 4sq.mm. as you imply - many vendors are lazy and describe 4sq.mm. cable as 4mm. Link to comment Share on other sites More sharing options...
Murflynn Posted June 15, 2019 Report Share Posted June 15, 2019 on the subject of confusing arithmetic, it really bugs me when advertisers claim something is '2 times more' when they mean 'twice as much'......... 2 times more means 3 times as much; if they want to claim it is twice as much they should say '1 time more', or more easily understood : 100% more. 1 Link to comment Share on other sites More sharing options...
Alan de Enfield Posted June 15, 2019 Report Share Posted June 15, 2019 (edited) 1 hour ago, Murflynn said: pedant alert - '4mm squared' is actually 16 square mm. If you want to be unambiguous it would be helpful to get the 'dimensions' right, in this case I assume you mean 4sq.mm. as you imply - many vendors are lazy and describe 4sq.mm. cable as 4mm. You are of course correct. As I spent 9 years designing cables for one of the UKs major cable makers I should have known better. (goes out into the yard, head down and quietly kicking small stones around) Edit to add - my excuse being I could not find the superscript button - and the 'squared' comes after the mm's in the notation anyway. Done it in word and copied / pasted 4mm2 Or - is the correct notation 42mm Edited June 15, 2019 by Alan de Enfield Link to comment Share on other sites More sharing options...
Murflynn Posted June 15, 2019 Report Share Posted June 15, 2019 34 minutes ago, Alan de Enfield said: You are of course correct. As I spent 9 years designing cables for one of the UKs major cable makers I should have known better. (goes out into the yard, head down and quietly kicking small stones around) Edit to add - my excuse being I could not find the superscript button - and the 'squared' comes after the mm's in the notation anyway. Done it in word and copied / pasted 4mm2 Or - is the correct notation 42mm yes, I can see where you're coming from. in dimensional analysis we would only use the notation: 4mm2 but in longhand and spoken it has to be 4 sq.mm. I am always bamboozled when someone says their living room is '16metres squared' - that makes it a ballroom. The worst offenders when using dimensions (that in their case they don't understand in the slightest) is journalists and documentary film makers when they refer to, for example, 'the wind farm that can supply 5,000 houses with electricity per year', or 'the power station that generates 5 megawatts per day'. Link to comment Share on other sites More sharing options...
David Mack Posted June 15, 2019 Report Share Posted June 15, 2019 4 minutes ago, Murflynn said: 'the wind farm that can supply 5,000 houses with electricity per year', or 'the power station that generates 5 megawatts per day'. What's that in amps per hour please? Link to comment Share on other sites More sharing options...
Murflynn Posted June 15, 2019 Report Share Posted June 15, 2019 24 minutes ago, David Mack said: What's that in amps per hour please? b****x !! Link to comment Share on other sites More sharing options...
Tony Brooks Posted June 15, 2019 Report Share Posted June 15, 2019 But it is not 4 sq mm full stop. It is not 4 sq mm overall cross sectional area. It is 4 sq mm CONDUCTOR cross sectional area. As Alan said the idiot manufacturers/suppliers insist in calling it 4mm cable Link to comment Share on other sites More sharing options...
Alan de Enfield Posted June 15, 2019 Report Share Posted June 15, 2019 Before the OP gets hung-up on 4mm cable he actually needs 8mm2 for his cable length and current. (I gave a link to the correct cable) Link to comment Share on other sites More sharing options...
TheBiscuits Posted June 15, 2019 Report Share Posted June 15, 2019 1 hour ago, Alan de Enfield said: Before the OP gets hung-up on 4mm cable he actually needs 8mm2 for his cable length and current. (I gave a link to the correct cable) Seems an unnecessarily harsh punishment for asking a reasonable question! 1 Link to comment Share on other sites More sharing options...
Murflynn Posted June 16, 2019 Report Share Posted June 16, 2019 10 hours ago, TheBiscuits said: Seems an unnecessarily harsh punishment for asking a reasonable question! that's what happens if you are stingy about cable sizes. Link to comment Share on other sites More sharing options...
Sea Dog Posted June 16, 2019 Report Share Posted June 16, 2019 18 hours ago, Murflynn said: yes, I can see where you're coming from. in dimensional analysis we would only use the notation: 4mm2 but in longhand and spoken it has to be 4 sq.mm. Well, to be fair, when spoken that size cable is normally referred to as "4 Mil". Link to comment Share on other sites More sharing options...
Murflynn Posted June 16, 2019 Report Share Posted June 16, 2019 (edited) 30 minutes ago, Sea Dog said: Well, to be fair, when spoken that size cable is normally referred to as "4 Mil". we know that, but therein lies the problem. ............. '4 mil' might mean summat to an electrician buying his stuff at the local wholesale outlet, but for the layman it is far better to use the correct description to avoid any misunderstandings. the guy at the counter isn't going to think any the less of you if you do, and even if he does who gives a XXXX ? if you are buying off ebay you may only see the shorthand version, which leaves some doubt, and it is likely that the vendor hasn't got a clue what he is selling. If you buy from a professional outlet like this, there is absolutely no doubt what you are getting: https://www.tlc-direct.co.uk/Main_Index/Cable_Index/index.html?ad_position=1t1&source=adwords&ad_id=109759653317&placement=&kw=electrical cable supplier&network=g&matchtype=b&ad_type=&product_id=&product_partition_id=&version=finalurl_v3&gclid=EAIaIQobChMIiZTi1OHt4gIVaLHtCh120AXpEAAYASAAEgIDH_D_BwE Edited June 16, 2019 by Murflynn Link to comment Share on other sites More sharing options...
Murflynn Posted June 16, 2019 Report Share Posted June 16, 2019 (edited) to go off-topic for a moment, isn't it absolutely daft that the conventions for describing the sizes of plumbing pipes is so inconsistent? There are websites that exist just to guide you how to specify pipe sizes, and in some cases, for example PVC waste pipe, even those websites don't help much when you go to screwfix or whatever to identify what you need. Edited June 16, 2019 by Murflynn Link to comment Share on other sites More sharing options...
Alan de Enfield Posted June 16, 2019 Report Share Posted June 16, 2019 (edited) 2 minutes ago, Murflynn said: conventions for describing the sizes of plumbing pies is so inconsistent? O' I don't know. A 4" Beef & Onion tends to be 4" Beef & Onion irrespective of you being a Plumber or an Electrician Edited June 16, 2019 by Alan de Enfield 3 Link to comment Share on other sites More sharing options...
Murflynn Posted June 16, 2019 Report Share Posted June 16, 2019 thankyou - sorted. Link to comment Share on other sites More sharing options...
Jen-in-Wellies Posted June 16, 2019 Report Share Posted June 16, 2019 44 minutes ago, Murflynn said: but therein lies the problem. ............. '4 mil' might mean summat to an electrician buying his stuff at the local wholesale outlet, but for the layman it is far better to use the correct description to avoid any misunderstandings It is even worse than that. To an American, 4mili might mean 0.004"! Most Americans firmly believe that if they go metric, then the terrorists have won. Link to comment Share on other sites More sharing options...
Tony Brooks Posted June 16, 2019 Report Share Posted June 16, 2019 and arn't "mils" something to do with parts of a radian? Link to comment Share on other sites More sharing options...
Murflynn Posted June 16, 2019 Report Share Posted June 16, 2019 I was watching a documentary about Mary Schweitzer from Montana who says she found organic tissue in a T Rex fossil 68million years old. The Creationists loved it - they reckon she has proved that the world was created 7000 years ago because everyone knows that organic tissue cannot exist for much more than a few thousand years. Link to comment Share on other sites More sharing options...
Alan de Enfield Posted June 16, 2019 Report Share Posted June 16, 2019 3 minutes ago, Murflynn said: I was watching a documentary about Mary Schweitzer from Montana who says she found organic tissue in a T Rex fossil 68million years old. The Creationists loved it - they reckon she has proved that the world was created 7000 years ago because everyone knows that organic tissue cannot exist for much more than a few thousand years. I wonder how the OP is getting on with wiring his dinosaur battery charger ? Link to comment Share on other sites More sharing options...
Murflynn Posted June 16, 2019 Report Share Posted June 16, 2019 he'll be extinct by now. 1 Link to comment Share on other sites More sharing options...
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