Armour Clad Instrument Cable

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Electrobe

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Can you have 600V ACIC (Armour Clad Instrument Cable) mixed with 600V MC (Metal Clad) power cable in a cable tray? Safety wise I think this is ok, but is it ok as per NEC 725?

The intrument cable has 4-20ma instrument signals and the power cable cables are 460VAC motor feeders.

Thanks
 
Electrobe said:
Can you have 600V ACIC (Armour Clad Instrument Cable) mixed with 600V MC (Metal Clad) power cable in a cable tray? Safety wise I think this is ok, but is it ok as per NEC 725?

The intrument cable has 4-20ma instrument signals and the power cable cables are 460VAC motor feeders.

Thanks
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Have to have the same voltage rating. I wonder though where can you find 600V rated instrument cable.
 
725.55(H) permits this installation and there is no requirement as to the votlage rating of the instrument cable.
 
I don't think that your instrument cable is a Class 1 circuit, so 725.48 does not apply. The correct section for the 2008 code is 725.136(G) (my previous post had a 2005 citation) and as long as your instrument cable is MC cable this installation is permitted.
(H) Cable Trays Class 2 and Class 3 circuit conductors shall be permitted to be installed in cable trays, where the conductors of the electric light, Class 1, and non–powerlimited fire alarm circuits are separated by a solid fixed barrier of a material compatible with the cable tray or where the Class 2 or Class 3 circuits are installed in Type MC cable.
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I see that you said the instrument cable is AC and that would not be permitted by this rule.
 
don_resqcapt19 said:
725.55(H) permits this installation and there is no requirement as to the votlage rating of the instrument cable.
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Stand corrected, but I was thinking of this:

ARTICLE 392? CABLE TRAYS
​
​
(E) Multiconductor Cables Rated 600 Volts or Less.​
​
Multiconductor cables rated 600 volts or less shall be permitted​
to be installed in the same cable tray.
​
​
(F) Cables Rated over 600 Volts.​
​
Cables rated over 600
volts and those rated 600 volts or less installed in the same
cable tray shall comply with either of the following:
(1) The cables rated over 600 volts are Type MC.
(2) The cables rated over 600 volts are separated from the
cables rated 600 volts or less by a solid fixed barrier of​

a material compatible with the cable tray.
 
don_resqcapt19 said:
I don't think that your instrument cable is a Class 1 circuit, so 725.48 does not apply. The correct section for the 2008 code is 725.136(G) (my previous post had a 2005 citation) and as long as your instrument cable is MC cable this installation is permitted.

I see that you said the instrument cable is AC and that would not be permitted by this rule.
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Thanks this helps.... but it brings up another question?

Class 2&3 circuits can be installed with power cables as per 725.136(G) but class 1 circuits cannot as per 725.48(4). Is this corerect?

Thanks
 
Electrobe said:
Thanks this helps.... but it brings up another question?

Class 2&3 circuits can be installed with power cables as per 725.136(G) but class 1 circuits cannot as per 725.48(4). Is this corerect?

Thanks
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It does appear that the code is more restrictive when installing Class 1 circuit with power circuits but it does not prohibit them.
(4) In Cable Trays. Installations in cable trays shall comply with 725.48(B)(4)(1) or (B)(4)(2).
(1) Class 1 circuit conductors and power-supply conductors not functionally associated with the Class 1 circuit conductors shall be separated by a solid fixed barrier of a material compatible with the cable tray.
(2) Class 1 circuit conductors and power-supply conductors not functionally associated with the Class 1 circuit conductors shall be permitted to be installed in a cable tray without barriers where all of the conductors are installed with separate multiconductor Type AC, Type MC, Type MI, or Type TC cables and all the conductors in the cables are insulated at 600 volts.
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The Class 2 and 3 rule only requires the Class 2 or 3 cable to be MC and does not address the insulation rating.
 
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