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10amp and 13 amp what is the difference?

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keithh
keithh e2 Member 1023111 forum postskeithh vcard Wallis and Futuna33 Constructive Critique Points
27 Jun 2013 - 12:24 PM

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27 Jun 2013 - 12:24 PM

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Lucian
Lucian  4561 forum posts
27 Jun 2013 - 1:01 PM

So if my sockets in the wall are 13amp and the fuses in my lights are 13 amp is it ok to use a 10 amp extension lead?

thewilliam
27 Jun 2013 - 4:49 PM


Quote: So if my sockets in the wall are 13amp and the fuses in my lights are 13 amp is it ok to use a 10 amp extension lead?

A chain is as strong as its weakest link and this weakest link has to be strong enough to support the load.

Look at the rating plate on your lights and add up the current ratings for all the lamps that you intend to use. You can calculate current by dividing wattage by 230 if no figure for amperage or current. Add up the current rating for all the lights that you intend to plug into the wall socket and use an extension cable with an equal or higher rating.

If you work out the total to more than 13 Amps, you'll need to use fewer lighting units.

Niknut
Niknut e2 Member 4629 forum postsNiknut vcard United Kingdom63 Constructive Critique Points
27 Jun 2013 - 4:56 PM

The formula is simple..........Amps X Volts = Watts !!

So 13a X 240v = 3000 w (rounded off) (so 3KW !!)

Use an extension lead with 10a fuse......10a X 240v = 2400w (2.4Kw)......add up all the Wattage values of your equipment
& don't exceed 2400w.........easy peasy !!!!!.Smile

Hope that helps........

thewilliam
27 Jun 2013 - 6:27 PM


Quote: The formula is simple..........Amps X Volts = Watts !!

So 13a X 240v = 3000 w (rounded off) (so 3KW !!)

Use an extension lead with 10a fuse......10a X 240v = 2400w (2.4Kw)......add up all the Wattage values of your equipment
& don't exceed 2400w.........easy peasy !!!!!.Smile

Hope that helps........

Your calculations are correct but here in the UK, we've had a 230 Volt supply for some decades now.

Martin54
Martin54 e2 Member 8498 forum postsMartin54 vcard United Kingdom
27 Jun 2013 - 7:10 PM


Quote: Your calculations are correct but here in the UK, we've had a 230 Volt supply for some decades now

Nominally 230V but.... UK/EU Mains Voltage Harmonisation

Niknut
Niknut e2 Member 4629 forum postsNiknut vcard United Kingdom63 Constructive Critique Points
27 Jun 2013 - 7:31 PM

Just run my Voltmeter across the mains in my house....& it's showing a steady 239volts......that's close enough for me, I'm
not gonna worry over 0.5% loss from 240 !!!!

Last Modified By Niknut at 27 Jun 2013 - 7:33 PM
Lucian
Lucian  4561 forum posts
27 Jun 2013 - 7:46 PM

I have 4 elinchrom dlite heads that I think are 200w each. so that should mean I have enough power? I think. My studio is opening a week on Saturday and I have 3 bookings for that day so I need to ensure I will be ok.

Niknut
Niknut e2 Member 4629 forum postsNiknut vcard United Kingdom63 Constructive Critique Points
27 Jun 2013 - 8:10 PM

200w equates to less than 1amp.....so 4 of 'em totals 800w....even a 5a fuse will cover it, so 10a is plenty !!

Good luck with your venture !!!!!

thewilliam
27 Jun 2013 - 8:26 PM


Quote: Just run my Voltmeter across the mains in my house....& it's showing a steady 239volts......that's close enough for me, I'm
not gonna worry over 0.5% loss from 240 !!!!

The EU standard is 230 plus or minus 10%. Our 240V and the German 220V lie within the tolerance. As supply transformers are upgraded or repaired, more areas will have their supply nearer 230V

thewilliam
27 Jun 2013 - 8:28 PM


Quote: I have 4 elinchrom dlite heads that I think are 200w each. so that should mean I have enough power? I think. My studio is opening a week on Saturday and I have 3 bookings for that day so I need to ensure I will be ok.

Your primary concern should now be the safety of trailing cables. You could gaffer-tape them to the floor so they don't present a trip hazard. And you do have Public Liability insurance?

Last Modified By thewilliam at 27 Jun 2013 - 8:29 PM
keithh
keithh e2 Member 1023111 forum postskeithh vcard Wallis and Futuna33 Constructive Critique Points
27 Jun 2013 - 8:51 PM

My Hoover is 1000watts, do I heed to convert to a three phase supply before I switch it on?


And before anyone thinks I'm being facetious, we have a thread on the safety aspect of plugging something in that has half the power of my kettle.

William has a more salient point when you consider four d lights on lightweight stands in a broom cupboard.

Lucian
Lucian  4561 forum posts
27 Jun 2013 - 10:33 PM

A broom Cupboard LOL. My studio background is 7ft wide with room for lights at the side and is 4 meters long so not to bad a space. The reason I am needing an extension lead is because the wiring in my studio is about 47 years old because it has never been re-wired since the property was built. It only has 1 double socket in each room including the studio room because it was built at a time where people did not need to run many electrical appliances at the same time.

Paul Morgan
Paul Morgan e2 Member 1315487 forum postsPaul Morgan vcard England6 Constructive Critique Points
27 Jun 2013 - 11:18 PM

Add the stands and lighting and what is left, not a lot.

Lucian
Lucian  4561 forum posts
28 Jun 2013 - 10:08 AM


Quote: Add the stands and lighting and what is left, not a lot.

So ok another couple of meters either way would be good but I am not charging for the sittings so people don't part with any money expecting a huge studio. There is photogrphers going to peoples homes to do shoots in small spaces so I am confident I will get good shots in this space. I have a 5ftx7ft lastolite hilite with lights that go inside. + a mottled grey muslin background that can be attached to the top of the highlight for mid key photography. I have 2 main lights with white shoot through brollys and I also have a 4.5 tog duvet at the floor as I don't like the lastolite train.

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