I.S and Non-I.S Cable Separation

Just don't lay any I.S blue cable close to any orange cable. The colors may bleed over.

(humor)

Thanks for reply....As explained, overally keeping separation is followed, but only very short area in tray fitting due to different direction of each cable have mixed case unavoidably...and I try to find kind of justification.

Without knowing where your plant is located, or what code requirements are in effect, it's hard to say.

If the "blue" cable is in fact a twisted pair, or if the "blue" cable is properly shielded and earthed, then there is no problem. The reason for the spacing and / metal barrier is to prevent electro-magnetic induction in the IS cable.

Sometimes, practical and cost considerations override standard practice on an evaluated risk basis. Is your plant running, or is this a new installation ?

Dear Mr.Hiton,

Thanks for your clear explanation..

Based on this, I also found the description through IEC which shows "No segregation is required if metal sheaths or screens are used for the intrinsically safe or non-intrinsic safe circuit.", and I reallized that some of customer do not need separation even whole run of cables due to such reason.

British Standard 5345 and its ISO equivalent.