@3DDave thanks, you are right, and for the first link you sent I did contact SAL and asked them if the filter is in t he SDD 'dimmer' or if i just get the SFI downlights then they will include a filter as well: they said the lights will be flicker immune even on manual ON/OFF switching not...
@stevenal thanks for your reply, there are a lot of apartments in the same building that are not experiencing any flickering. Also these are LED lights not incandescent: the incandescents back in the day used to have 'thermal inertia' to ride through frequency canhed, for LED: it all depends on...
Hi,
I got 2 other videos:
Video 1
Video 2
This is high frequency and different in kind from the first flickers which appear to be voltage drop issue due to high impedance / loose connection.
I have a feeling it is due to the controlled-load frequency that the supply authorty delivers in the...
For the loose wiring termination, am I correct in understanding it this way: the loose connection is causing a high impedance contact with the power supply, therefore reducing the applied voltage. With the reduced voltage: the capacitors in the ballast do not have sufficient time to charge hence...
Hi,
What can be causing these lights to flicker?
1: https://www.dropbox.com/s/9wyc7vck7n7dkex/Defect%20%231%20-%20garden%20lights.MOV?dl=0
2: https://www.dropbox.com/s/cj6or3x1awmdhnu/Defect%20%232.A%20-%20garden%20lights.MOV?dl=0
3...
Hi,
Can you please put a link to a whitepaper, forum or similar regarding the requirements for protecting electrical and control cabling in a fuel refinery?
Something like: use X kind of heat shrink as the cable enters the conduit, then use cable glands type X as the cable enter the equipment...
Hi,
We have an expensive piece of equipment that can withstand only about 4,000,000 A²s let through energy.
There is no circuit breaker fast enough to clear a fault that quick, so we would like to place a fused isolation switch right next to that device. The semi-conductor fuses should be...
I got these formulas but wonderinig how to use them in HV:
Z = impedance per phase
ULN = phase to neutral voltage
ULL = sqrt(3) x ULN
3-Phase fault: Ik = ULN / Z
Earth Fault: Ik = ULN / (Z+Z0)
and just for the record 2-phase fault: Ik = ULL / (2 x Z) which I think is easiest to understand...
@FreddyNurk
You are correct, I am not designing for fault withstand capacity I am designing for grading. I know, the inclusion of the upstream impedance will reduce the fault level to its actual value not the theoretical maximum based on infinite upsteram bus.
Yes I have your same assumption...
I want to calculate the short circuit at my main switchboard.
I have the transformer's data (2MVA, 6%) and I have the network upstream fault so I use:
1 / MVA system = 1 / MVA utility + 1 / MVA transformer
I presume that's correct, right?
Only one more thing: for the utility they gave me the...
Hi,
A 3 phase cable with 240 mm2 cross section for each of the phases is required to connect to a 160 A circuit breaker.
The cable is too large (2.2 x the cross section of AWG 0000 (4/0)), and the terminals on the circuit breaker do not fit.
What accessories would be a good 100% legit (not...
Hi ScottyUK
No we are not thre yet, RCD is required for many applications (AS 3000 section 2.6.1) but not for all applications and not for all concealed wiring. But I think the question is not only realted to concealed wiring, the question is whether or not the earthing of a metal part is a...
Hi rtronics, yes precisely 5.4.6.
the 0.5 ohms is for the bonding conductor itself not for the whole resistance of the bonding conductor + resistance to earth of the metal frame.
the maximum resistance of the main earthing coductor connecting the earh bar in the main switchboard to the main...
