SELV/Control wiring

[WaterSparky]

I was wondering if voltage drop applies to SELV etc voltages, situation in question like 24V AC & DC for control etc?
Surely not?

Along the same lines if 230V is used for control for example:

230V coming back from a panel and indicating when a item of equipment is running and indication lamps being lit in a control room or alike?
Does this come under voltage drop regulations?

Cheers

 

[Outspoken]

I was wondering if voltage drop applies to SELV etc voltages, situation in question like 24V AC & DC for control etc?
Surely not?

Along the same lines if 230V is used for control for example:

230V coming back from a panel and indicating when a item of equipment is running and indication lamps being lit in a control room or alike?
Does this come under voltage drop regulations?

Cheers

I'll give you a clue...IT'S CALLED VOLT DROP​, it is not not 230V drop!!

 

[WaterSparky]

Sorry I'm only an apprentice, it was only a question. So I don't know what I did to cause that reply?

 

[stuartcourt]

nothing we just get some stupid questions but fine from an apprentice think you got your answer though

 

[ferg]

I can't remember where I saw it, but someone on here has a sig

"once you have enough knowledge to satisfy the old boys you're too old and knackered to use it"

In my opinion there is no such thing as a stupid question, just a stupid answer

As an apprentice I got used to hearing.."what the .... do they teach you at college!!!"

If you start your questions with I'm an apprentice you might get a bit more slack

 

[v.elec]

I'll give you a clue...IT'S CALLED VOLT DROP​, it is not not 230V drop!!

Unnecessary.

 

[plugsandsparks]

I used to have an escort rally car and needed really bright lights. When i measured the volts at the lamps i was getting 10.8 instead of 13V. I re-wired the lighting taking a feed directly off the alternator, through relays and re-wired direct ground cables to the chassis, all in the name of reducing volt drop and that was only 12V DC, so yes i matters alot.
cheers

 

[WaterSparky]

Thank you I'll just put my sig as Apprentice haha.

I was just thinking with with 24V DC you couldn't really apply volt drop (obviously you could but it's slightly different) as it's not really like mains voltage and is a part of a control circuit for starting a pump or on emergency stop. Struggling for words here really.

 

[KAS1]

Put it this way 24v on a 100mt cable run controlling a relay or control valve I think you'd have to consider volt drop

 

[WaterSparky]

Think I worded this wrong from the start. My understanding WASNT that some how magically 24V or selv was immune to voltage drop. I just meant would the selv/control part of an installation fail the electrical installation certificate? Even if the control part was over the allowed values, just made me think that I was at work we fault finding a motor starter, and the 24V coil was still pulling in at around 19V.

Cheers for the replies though guys