Answer / r k nair

Normal Cable Gland is also called Single Compression Cable
Gland. As the name suggests, while you tighten the gland,
the grip or compression is effected only at one p[lace
(i.e.) at the cable armour only. There is scope for
moisture and corrosive vapour to enter the gland and thus
into the cable.

Whereas in Double-Compression Glnad, the compression
happens both at the cable armour as well as at the inner
sheath. This is sort of two sealings. Hence, chances of
moisture or vapour entry are minimised. Hence these glands
are also known as Weather-proof cable glands or Flame-proof
cable glands.

Answer / raffi

Single compression glands used for the unarmoured
cables.since you can make the grip only on cable sheath
whereas Double compression glands are used for armoured
cables as we can tight it with both cable inner sheath also
in cable armour.

Both glands can be used for exlosion proof areas, only
thing is that it should be certified for zone
classifications

Answer / sumith

single compression cable gland is used for normal panels and
it is not airtight.(it cant be used in flammable areas)
double compression cable gland is used for air tight panel i.e
purge panels(used in flammable areas)

What is the principle of a Pressure gauge?

2 Answers   CCIE,

---

in split range control system we are using two control valves,but we have only one positioner and one feed back link.so how we use this one feed back link for two control valves?

2 Answers  

---

What is pipe schedule? What are all effects its having in the valve? how do we take care of pipe sch in case if the customer dint specify in the data sheet. What we need assume and in what basis?

3 Answers  

---

WHEN BOTH WIRES OF THERMOCOUPLE R SHORTED WHAT IS THE OUTPUT THE TEMP ARE 0,30,250,320

13 Answers  

---

What is the function of SMPS

2 Answers  

---

What skill/s does the Instrument Technician has?

6 Answers  

---

Hello friends i need check lists of different instruments during the Erection and commissioning in thermal power plant.Please help me.My Mail id is naba02222@gmail.com/naba02222@rediffmail.com Thanks Nabakishore Biswal

1 Answers  

---

With N nodes and B branches what will have a network ???

0 Answers   BSNL,

---

how we calculate error in percentage when instrument calibrat

1 Answers  

---

What is actuator what is motorized control valve?

5 Answers   Emco,

---

whats diffeence between dcs & scada operation.

3 Answers   Orchid, Reliance,

---

hi,i am doing 3 year in electronic and instrumentation engineering. what type of aptitude questions will be asked in a core industries and how can i improve my skills in instrumentation?

0 Answers  

---