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  • Users: qqitek
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  1. qqitek

    Area Classification API 505 vs IEC 60079

    Hello Folks, my customer is building plant and entire electrical area classification is per API 505 rev 2013 (with all later additions/ammendments) methodology. Now one of big packages comes made per IEC 60079. As far as i know, there are small differences despite desire for harmonization of...
  2. qqitek

    Motor terminal box fault withstand capability. 13.2kV motors.

    Dear Folks, I got confused by API 546 cl. 3.1.2 requirement on motor terminal box (MTB) with rupture discs, which states: "The terminal box for the main power lead terminations shall be capable of withstanding the pressure build-up resulting from a three phase fault of the specified MVA...
  3. qqitek

    IEC 60364-5-52 Multilayer cable routing reduction factor sizing

    Hello Folks! I have question regarding IEC 60364-5-52 regarding approved methodes of cable routing via ladders/trays and derating factors. Q1) Table B.52.17 item 1. Can we use the worst reduction factor (0,38) for multilayer cable routing? It is very often that cables are laid on several layers...
  4. qqitek

    lightning protection of hazardous areas

    thread248-100920 Hi Mates! I would like to know your opinion on lightning protection on areas where zone 1 and 2 are classified. I met design that all parts of LPS are outside hazardous zones. It is reasonable. However the att D5.1 of IEC 62395-3 says that 1m separation is needed, but if it is...
  5. qqitek

    LV cable waterproofing

    Hello Folks, In one of our project for power plant there is customer requirment stating: "Cables shall be rated IPX7 water-resistant (temporary submerged IEC 60529)". It is strange requirement, because IEC60529 is about enclosures, not cables. I made review among cables vendors and it occured...
  6. qqitek

    HV disconnectors orientation towards OHL or power supply.

    Hi Fellows, I have question regarding 132kV vertical break disconnecting switch. Is there any rule (IEC, ANSI, NEC, BS whatever) determining orientation of disconnector in relation to the incoming supply? That means - jaw end shall be connected towards the incoming supply, while travelling...

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