Circuit Wiring...??

[Alwayslearningelec]

I am estimating a job and have this note.

"Lighting fixtures provided with em battery packs and indicated with switch control shall be wired with battery charging/sensing circuit wired ahead of switch control". I understand everyhting up to the battery charging /sensing circuit.

What is a battery charging sensing circuit and what do I need to figure?

Thanks

 

[iwire]

You need the neutral, a constant hot and a switched hot all from the same circuit.

The constant hot is the battery charging /sensing circuit.

 

[Rewire]

The constant hot is the "sensing" circuit and the "charging" circuit.You will need to figure for the extra wire,on one store we had to install thye battery ballast because they were shipped seperatly they fought us on the change order but eventually paid.

 

[Profish00]

I charge a extra.7 hr for those

 

[Alwayslearningelec]

See this is where I wish I would have worked in the field. So if I am carrying two wires fo the em I need an extra wire. A neutral is a constant hot? So if I have a two wire em circuit one hot and one ground the hot is not always constant. Am I right?

Thanks again.

 

[Profish00]

The battery ballist needs a constant hot, so yes you need 4 wires instead of three. 1-constant hot Just for the charging of the battery (loss of power to that panel will turn on the battery back-up) 1- switched so the lights go off and on. 1-neutral and 1- ground.

 

[Rewire]

See this is where I wish I would have worked in the field. So if I am carrying two wires fo the em I need an extra wire. A neutral is a constant hot? So if I have a two wire em circuit one hot and one ground the hot is not always constant. Am I right?

Thanks again.

If your EM light is turned off at night with the rest of the lights you will need to run a constant hot wire that also powers the switch for the em light,you need constant hot on the battery back up ballast if your EM light is a night light that is never switched off then you already have a constant hot for the battery ballast.

circuit a1 hot------------switch------------ballast
a1 hot-------------------------------battery backup
neutral-------------------------------ballast/battery backup