Aux control wiring OCP

[wch]

Mfr says to use 2 #18 AWG connected from auxiliary contacts in a 30/25/3W fused safety switch wired to a local manual controller on wheelchair lift. The
120 V. circuit is fed from a 25/1P CB. Does the 18 AWG control circuit need an in-line fuse? (Safety switch serves the 120v., 1-1/2 HP chair lift motor.)

 

[Dennis Alwon]

Is the control cir. low voltage or 120V?

 

[wch]

To: Dennis Alwon

To: Dennis Alwon

Control ckt is 120--(I think the control supply is supposed to come out of the same 120v safety switch line side.) But, the chair lift may have a control T/F to supply the controller circuit--
then the aux contacts enable the control circuit when the safety switch is turned ON. I didn't see a mfr's diagram.

 

[Dennis Alwon]

I am not sure , to be honest. I don't see these as feeder taps so that takes you to art.240.21(A) which directs you to 210.19 and 210.20. After reading them I think aux. OCP is necessary--- someone else want to chime in.

If the branch circuit conductors are #12 or #10 just run that size and be safe.

 

[wch]

Reply to Dennis

Reply to Dennis

Thanks a lot for the free advice--article 725 is a bottomless pit--
yes-- I would take the easy way out and use #12, but I'm
supposed to know the answers using insufficient information--
that's what engineers are supposed to do from what I hear.
I just added a catch all note to provide all necessary OCP
and connect per mfr's wiring diagram.

 

[jusme123]

430.71 '08 code, table 430.72(B) note control ckt conductor sizes

 

[Dennis Alwon]

430.71 '08 code, table 430.72(B) note control ckt conductor sizes

Thanks, I never saw that. My understanding was that the OP's control circuit extended beyond the enclosure so OCP of 7 amps would be needed.

 

[wch]

To Dennis & Jusme

To Dennis & Jusme

That looks like a wrap. The 25A is good for the 18 AWGcontrol to the motor load per my 2005 NEC 430.72 (B) (2).
I appreciate your help.
wch

 

[Dennis Alwon]

That looks like a wrap. The 25A is good for the 18 AWGcontrol to the motor load per my 2005 NEC 430.72 (B) (2).
I appreciate your help.
wch

That is true if the conductor does not leave the enclosure of the branch circuit. If you need to run these conductors to a wall unit or somewhere other than the enclosure for the branch circuit then you need a 7 amp OCP. At least that is how I read it.

 

[jusme123]

yw. can you both take a look at my post in the lighting section regarding inboard/outboard lights

 

[cadpoint]

Mfr says to use 2 #18 AWG connected from auxiliary contacts in a 30/25/3W fused safety switch wired to a local manual controller on wheelchair lift. The
120 V. circuit is fed from a 25/1P CB. Does the 18 AWG control circuit need an in-line fuse? (Safety switch serves the 120v., 1-1/2 HP chair lift motor.)

Just a thought! It is probably the wrong 1 ...... nevermind

 

[wch]

Meaning, the control wires can run from the fused switch in the same raceway with the
branch circuit conductors to the motor located in the
wheelchair lift enclosure--say about 24" ?
wch

 

[Dennis Alwon]

Meaning, the control wires can run from the fused switch in the same raceway with the
branch circuit conductors to the motor located in the
wheelchair lift enclosure--say about 24" ?
wch

I don't think so. If the control wires originate in an enclosure then it must remain in the enclosure unless you fuse it at 7 amps.

 

[LarryFine]

If the control wires originate in an enclosure then it must remain in the enclosure unless you fuse it at 7 amps.

Unless he ups the wire size, I must concur.

(What would you guys do without me? )

 

[wch]

Reply to Larry Fine Re: control wires outside encl.

Reply to Larry Fine Re: control wires outside encl.

Larry,

Once again, I thank you. I'm still in the dark on control circuits--it will
take a lot more study.

wch