I'm only involved in classified area designs once every blue moon, so I'm rusty every time I look at one.
I have float switch in CID2 area and I just need the signal back to a control box in unclassified area. Float switch is explosion proof.
Concept that I'm evaluating:
XP Float switch through side wall of tank
Float switch to junction box mounted on side wall of tank using flex conduit and the wire supplied with float switch.. Probably LFMC.. Per 501.10(B)(2)
- Fittings are listed but just general purpose
- No seals in LFMC
Junction box is just general purpose per 501.10(B)(4) and 500.8(B)(3). No special markings or classifications.
From junction box to unclassified area (therefore crossing boundary) control box using MC per 501.10(B)(1)(5)
- Fittings are listed but just general purpose
The MC cable may or may not need a seal depending on exact cable per 501.15(E)(2) through 501.15(E)(4) . The junction box is not required to be explosion proof so a seal is only needed if it is a cable as 501.15(E)(4). i.e. a seal will not be needed from 501.15(E)(1)
So potentially this:
(Float)--(LFMC)--(JB)--(MC)---(Ctrl Pnl)
where the boundary from CID2 to unclassified is during the MC run
Anything wrong here?
2017 NEC
I have float switch in CID2 area and I just need the signal back to a control box in unclassified area. Float switch is explosion proof.
Concept that I'm evaluating:
XP Float switch through side wall of tank
Float switch to junction box mounted on side wall of tank using flex conduit and the wire supplied with float switch.. Probably LFMC.. Per 501.10(B)(2)
- Fittings are listed but just general purpose
- No seals in LFMC
Junction box is just general purpose per 501.10(B)(4) and 500.8(B)(3). No special markings or classifications.
From junction box to unclassified area (therefore crossing boundary) control box using MC per 501.10(B)(1)(5)
- Fittings are listed but just general purpose
The MC cable may or may not need a seal depending on exact cable per 501.15(E)(2) through 501.15(E)(4) . The junction box is not required to be explosion proof so a seal is only needed if it is a cable as 501.15(E)(4). i.e. a seal will not be needed from 501.15(E)(1)
So potentially this:
(Float)--(LFMC)--(JB)--(MC)---(Ctrl Pnl)
where the boundary from CID2 to unclassified is during the MC run
Anything wrong here?
2017 NEC