24 x 400w metal halides advice

[solo2771]

why fp 200?

 

[sparks1234]

why fp 200?

Some use T & E which I am not really in favour of up there but there is no reason why not. FP does clip down and sits nicely. Either way it is a lot easier than SWA

 

[Darkwood]

16A is the maximum you can have on a lighting circuit under the 17th

What if each light is fused down through a connection unit?

 

[pennywise]

Hi tuff all the way.

 

[Darkwood]

Checked the SQ-D mcb tech' section, if you have a 16A (D) then the max is 4 * 400w metal halides.
All the mcb brands usually sing a similar tune, making this a type (c) or (b), increasing the no' of lamps or decreasing the mcb rating will all make you prone to nuisance tripping on start up.Note using to type (d) will limit your allowable ELI dramatically so take this into account when running long runs.

 

[solo2771]

Checked the SQ-D mcb tech' section, if you have a 16A (D) then the max is 4 * 400w metal halides.
All the mcb brands usually sing a similar tune, making this a type (c) or (b), increasing the no' of lamps or decreasing the mcb rating will all make you prone to nuisance tripping on start up.Note using to type (d) will limit your allowable ELI dramatically so take this into account when running long runs.

so 8 x 250 W on a 20 should be about the max, Still don't fancy all that conduit work

 

[Darkwood]

so 8 x 250 W on a 20 should be about the max, Still don't fancy all that conduit work

It doesnt calculate like that its what the mcb's inrush can withstand with multiple inductives loads and this doesn't calculate uniformly thats why you need to pick your method then refer to the tech on your brand of mcb.
Ive followed so many sparkies who think 1.8 factor applies when working out mcb rating and type on inductive loads and this is not the case, then they scratch their heads when the get a call about mcb's tripping when lights switched on.
College dont touch on this subject and i believe they should. Well they didnt in my days.

 

[sparks1234]

I have always put mine on C type breakers and never had a problem