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12-18-2008, 04:41 PM #1
Anchor Requirements For Condensor Conductor To Disconnect
What is the maximum span of anchors for the conductor from the AC condensing unit to the disconnect. Its not real clear to me, but for some reason 36" keeps coming to mind. The one in the photo (left side) was ~ 6 or 7 feet in length and had no anchor. The one on the right was installed behind the wall. Im not sure why they were installed differently, but welcome to Houston Home Building.
12-18-2008, 05:11 PM #2
Re: Anchor Requirements For Condensor Conductor To Disconnect
Those disconnects should not be located behind the equipment anyway, so let the electrician decide when he moves the switches.
12-18-2008, 06:41 PM #3
Re: Anchor Requirements For Condenser Conductor To Disconnect
What Rick said, which makes the following moot:
From the 2008 NEC.
- 350.30 Securing and Supporting. (underlining is mine)
- - LFMC shall be securely fastened in place and supported in accordance with 350.30(A) and (B).
- - - (A) Securely Fastened. LFMC shall be securely fastened in place by an approved means within 300 mm (12 in.) of each box, cabinet, conduit body, or other conduit termination and shall be supported and secured at intervals not to exceed 1.4 m (4½ ft).
- - - - Exception No. 1: Where LFMC is fished between access points through concealed spaces in finished buildings or structures and supporting is impractical.
- - - - Exception No. 2: Where flexibility is necessary after installation, lengths shall not exceed the following:
- - - - - (1) 900 mm (3 ft) for metric designators 16 through 35 (trade sizes ½ through 1¼)
- - - - - (2) 1200 mm (4 ft) for metric designators 41 through 53 (trade sizes 1½ through 2)
- - - - - (3) 1500 mm (5 ft) for metric designators 63 (trade size 2½) and larger
- - - - Exception No. 3: Lengths not exceeding 1.8 m (6 ft) from a luminaire terminal connection for tap conductors to luminaires, as permitted in 410.117(C).
- - - - Exception No. 4: Lengths not exceeding 1.8 m (6 ft) from the last point where the raceway is securely fastened for connections within an accessible ceiling to luminaire(s) or other equipment.
Note that none of the exceptions apply.
Note that once the disconnects are relocated (see Rick's post), the above will need to be done all over again.