Each duct heater must be provided with a thermal cut-out and a temperature control switch what ever is the rating, but not individual flow switch. However it is required that an interlock be used on the Air Handling Unit (AHU)to trip the heater circuit in case the fan stopped.
This is something serious,however I presumed the reason why you need to adjust it because it is tripping inadvertently as wbd suggest. My "guesstimate" is this breaker was originally set at Iins=8*Irated, so, if you don't find anything abnormal then you may raise up to Iins=11*Irated BUT mind...
The issue is about fire class and additionally, as you mentioned, between hazardous and non-hazardous area. The requirement is "penetration MUST be sealed according to the intergrity of the boundary no matter ladder or solid tray is used".Generallry cable trays are terminated 100-300mm from the...
We have exactly the same problem in our acquired vessel in China and its 15 days before delivery (June 2006) until our company decided to send electrical surveyor. Our site Manager and YARD says its too late to make changes, however we stick to the requirement. Vessel was delivered a month and a...
Hello all;
In our new building project a plate type heat exchanger (sat.steam and water media)is installed for Cargo Tank Washing system.Due to space limitation, "Cross flow" is difficult to achive so YARD propose "Parallel flow".Does anybody tell me how much efficiency will be lost following...
You're worried about harmonics? on the operational point of view,as long as the cables and motors are not overheating then it COULD be acceptable,but of course there's limitation, however running this along or in bunch with signal cable is not acceptable. All our VFD cables vis-a-vis signal...
I presume that your generator is driven by an internal combustion engine and the situation was not like this from the very beginning. To begin with a cheapest solution have a mechanic check the GOVERNOR paying attention to the adjustment of speed setting and "speed droop" while observing the...
"Dead front delayed action circuit breaking receptacle" is one of those explosion-proof PLUG and SOCKET literally without anything on the front (except the removable weather protection cover on the bottom), once you inserted the male plug you must twist it to be connected. The mechanical...
Thanks DanDel, in addition to your advice, I received info from the Maker that they acknowledged MICROLOGIC 5.0P has inherent problem regarding EMC. Trip unit built after week 50 of 2005 is verified to have full or reliable electro Magnetic compatibility by adding capacitor. We will conduct full...
The most common and difficult to removed is grease/oil contamination,so I presume this is one of the reason why you asked for cleaning solvent without CTC.In our fleet, we're using LECTRA CLEAN (20 L/can) for cleaning motors which are heavily contaminated by over greasing of open type ball...
When a motor is installed, either old or new, common practice is to measure the insulation resistance before switching on the power to ensure the condition of the winding. Skogsgurra is correct that it is wrong connected to double Y.
We're building 8 vessels and using MASTERPACT NW ACB with STR58U trip system for our generators. After the delivery of vessel no.2, the Maker of ACB informed us to install MICROLOGIC 5.0P because STR58U is out of production,which we agreed,however we have this nuiance tripping "AP" indication...
Generally three phase motor that single phased will not start, what you will hear is a humming sound followed by tripping of overload relays. Sustained single phasing without protection system tripping will result to overheating and burning.
