Power & Control cables - Hazardous area

[power2020]

Dear Folks,
I have come across some problems in present project?
I have following queries.

1)Is there any code that details about the placing of cables in Zone2 hazardous area?

2) What's the usual method of cabling in Zone2 area,
Can we go for cable tray?. if it is cable tray (to use on zone 2 area)
do we need to use fire proof cables?
or,
will normal XLPE (Cu/XLPE/LSF/SWA/LSF)serve the purpose?.
off course, it is clear that we should use duct bank at road crossings, parking areas etc. However, i am just looking at your opinions for cabling at zone 2 area.

3) Can we use Cable trench with removable top covers for series of pump house motors (11kv Fuel oil pump motors -3nos in a row)?
Or we should use only cable ducts / with pipe sleeves at entry of motor from undergournd as it is zone 2 area.

i greatly appreciate your suggestions..

 

[willip]

Tray is fine in any Zone.
No need for fire-retarding cable.
A good guide for cabling is BSEN5308

 

[power2020]

Hi Guys,
Can we use removable GI checker plates /covers on the top, or pre-cast concrete covers? (in these zone 2 areas.
which one is better, concret covers or GI/steel covers..
Thansk willip, I will see BSEN5308.

 

[sslobodan]

The more important thing is that your cables should be fire proof. You cant use regular cables in there, and the laying of cables are requested to be in metallic pipes buy most countries in Europe. generally you cant use Cable trench with removable top covers idea is to remove leaking of oil in it although those power proof cables are oil proof too but short circuit can ignite oil. Depending on a level of fire danger you can use regular metal rack with cover, that are higher than oil tanks in room (if we are talking about building installation ) But in areas with flammable gases you need to use pipes(tubes) that are fire resistant for some time . Also all crosses trough walls in fire sections must be made trough pipes that are sealed with fireproof material. In general Fe-Zn pipe that you use for extra grounding should be enough for this purpose.

 

[ePOWEReng]

In a Class 1, Zone 2 area you need to make sure that the electrical equipment doesn't produce a ignitable spark under normal operating conditions -- that is the main guide line. There are other NFPA guidelines that depend on your industry and the source of the hazard. Zone 2 means that there is not ignitable concentrations under normal operating conditions.