Inverter wiring ?

[Bob_Ranft]

Just been reading the article on the inverter tests / installation in the March issue of YM. Pages 70 to 74. On page 71 advice given to wiring higher output models suggests using 50mm square cable with a max cable length of 1.5 metres with properly crimped lugs etc. And if you have to mount the inverter further away use 70mm square cable - or two 35mm square cables in parallel for both positive and negative.

I've always been advised that using two cables in parallel is very definitely an electrical no no for any form of electrical installation.

Can the more electrically minded please advise on this - the wiring suggestion appears to be very wrong to me.

Thanks

 

[andy01842]

House wiring has used "ring mains" for a very long time, which is basicaly 2 wirers in parallel.

 

[nedmin]

If the 2 ends are jointed properly no probs. In heavy industry it is common practice otherwise you get cables too heavy and inflexible to deal with.

 

[DaveS]

No reason not to use parallel cables if you need to to get sufficient cross section. Obviously the normal rules apply: properly terminated, etc. etc.

 

[Gypsy]

An important factor when using parallel cables in heavy current situations such as this (other than good termination) is that they should be the same diameter/rating and the same length. There is resistance in all wire and under heavy loads small differences can make a difference and one cable ends up carrying more current than the other with the potential of exceeding its rating.
Ray

 

[Bob_Ranft]

Re: Inverter wiring ?(Re: Gypsy)

Thanks to all for your advice. Obviously parallel cables can be used if done correctly. What prompted me to question this was something in the back of my mind concerning one cable burning out due to incorrect installation as mentioned by Ray.

Thanks again.

Bob