Relay Coordination Time: BS 142:1966 Confirmed?

  • Thread starter Thread starter fannypf
  • Start date Start date
  • Tags Tags
    Relay
AI Thread Summary
The discussion revolves around verifying whether BS 142:1966 specifies a relay coordination time of 0.4 seconds. The original poster does not have a copy of the standard and is seeking confirmation from others. Suggestions include checking local libraries and reaching out to a member experienced in the power industry for assistance. There is a reminder to avoid using text speak in the forum. The poster expresses gratitude for the guidance provided.
fannypf
Messages
3
Reaction score
0
hi..i want to know if anyone of you can confirm of BS 142:1966 for relay coordination time is 0.4s? thx
 
Last edited by a moderator:
Engineering news on Phys.org
fannypf said:
hi..i want to know if anyone of you can confirm of BS 142:1966 for relay coordination time is 0.4s? thx

Do you not have a copy of the standard?
 
hi...nope..i don't hv d copy..i've been looking in d i'net...but..i need to verify if BS142:1966 states that the grading time from relay to relay is o.4s..

thx
 
fannypf said:
hi...nope..i don't hv d copy..i've been looking in d i'net...but..i need to verify if BS142:1966 states that the grading time from relay to relay is o.4s..

thx

Please stop using txt speak here in the forums. Please check your private messages (PMs) about it.

On your question, you might get lucky here if somebody has a copy. But you might want to check with your local libraries or other resources.

You might also try PM'ing m.s.j with your question. He works in the power industry, I believe.

https://www.physicsforums.com/member.php?u=84682

.
 
o...thanks a lot..and..sorry about the txt speak..i'll bear that in mind..uhm...yea...thanks...i'll check with the local libraries and other resources..

and,thanks for giving me the contact..i'll PM him..i believe he can help...thank you again,berkeman...
 
Hey guys. I have a question related to electricity and alternating current. Say an alien fictional society developed electricity, and settled on a standard like 73V AC current at 46 Hz. How would appliances be designed, and what impact would the lower frequency and voltage have on transformers, wiring, TVs, computers, LEDs, motors, and heating, assuming the laws of physics and technology are the same as on Earth?
While I was rolling out a shielded cable, a though came to my mind - what happens to the current flow in the cable if there came a short between the wire and the shield in both ends of the cable? For simplicity, lets assume a 1-wire copper wire wrapped in an aluminum shield. The wire and the shield has the same cross section area. There are insulating material between them, and in both ends there is a short between them. My first thought, the total resistance of the cable would be reduced...
I used to be an HVAC technician. One time I had a service call in which there was no power to the thermostat. The thermostat did not have power because the fuse in the air handler was blown. The fuse in the air handler was blown because there was a low voltage short. The rubber coating on one of the thermostat wires was chewed off by a rodent. The exposed metal in the thermostat wire was touching the metal cabinet of the air handler. This was a low voltage short. This low voltage...
Back
Top