NEC 517.30.C.3,Emergency system wiring

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Valeite

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In the Middle East we see a mixture of codes in use, but mainly NEC/NFPA and UK (BSI).

Per NEC 517.30.C.3, the emergency system wiring for a HCF shall be mechanically protected.

I understand that typically this constitutes metal conduit but could include concrete-encased schedule 40 PVC piping.

As I'm from the UK my first thought for the MV installation is armoured cable (ie XLPE/SWA) on tray.....

Question.: could the armouring be classed as mechanical protection or should the distribution cabling be installed within a conduit system to meet NEC?

thanks!!

:)
 
I don't know if SWA could be classed as "Mechanical Protection" but I certainly would prefer Rigid Metal Conduit versus Served Wire Armor for protection from a falling object.It might get crushed but it would have a better chance of survival over a spiral wound wire armor IMO.

Derating the cable and adding tray covers may be what you are looking for.

dick
 
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NEC 517.30(C)(3)(1) indicates that the raceways must be non-flexible, type MI cable, or Schedule 80 PVC conduit. Flexible raceways only allowed in prefabricated medical headwalls, office furnishings, fished into existing walls/ceilings, or final flexible connection to equipment.
 
Shoe said:
NEC 517.30(C)(3)(1) indicates that the raceways must be non-flexible, type MI cable, or Schedule 80 PVC conduit. Flexible raceways only allowed in prefabricated medical headwalls, office furnishings, fished into existing walls/ceilings, or final flexible connection to equipment.
Click to expand...

Not sure if you picked up on the emphasis of my original question.. the armoured cable is on traywork (ie a non-flexible "raceway"... sufficient to meet NEC?​
 
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