Upload
doancong
View
213
Download
0
Embed Size (px)
Citation preview
Copyright 1999-2015 Dan Dudley
Code Citations – how to find110.14(C)(1)(a)
Chapter (1)Article (110)
Section (14)
Subsection (C)
Subsection (1) under (C)
Subsection (a) under (1)
T.220.55
Table
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 1
Copyright 1999-2015 Dan Dudley
Two of 198 code violations in a 1999 5mil school gym
Condensatedrain andwater on
floor
314.25Covers to be on
all finishedboxes
110.12(A)Openings to be
closed 110.3(A)(8)Safeguarding of
persons
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 2
Copyright 1999-2015 Dan Dudley
More violations314.23Independent
support for boxes
314.25Covers to be
on all finishedboxes
110.12(A)Openings to be
closed
314.29Boxes to beaccessible
A/C Ductwork isnot an approved
support for conduit
358.30Fastening of
conduit
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 3
Copyright 1999-2015 Dan Dudley
300.11Ceiling support
wires not allowedas conduit support
300.11Support wires
must be securedat both ends and
identified asconduit supportwires separatefrom the ceiliggrid support
wires
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 4
Copyright 1999-2015 Dan Dudley
EMT358.30(A)
Support within3 ft. of box is
required
Ceiling tiles arenot approvedfor conduit
support
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 5
Copyright 1999-2015 Dan Dudley
#9ceiling support
wire is notapproved for
conduit support
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 6
Copyright 1999-2015 Dan Dudley
#9ceiling support
wire is notapproved for
conduit support
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 7
Copyright 1999-2015 Dan Dudley
358.30(b)EMT SUPPORTrequired within
3ft oftermination
Box needs to besupported
independentlysince EMT is not
approved forsupport
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 8
Copyright 1999-2015 Dan Dudley
The BUMPER onyour truck is notapproved as aconduit bender
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 9
Copyright 1999-2015 Dan Dudley
Plumbers strapis not approvedfor BONDING
Conduitrequires
support otherthan connector
to box orenclosure
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 10
Copyright 1999-2015 Dan Dudley
More dangerous violations
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 11
Copyright 1999-2015 Dan Dudley
Factoryends leftHOT andexposed
277 Volts onyellow and
orange leads
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 12
Copyright 1999-2015 Dan Dudley
Clearance… WhatClearance ???
110.26(F)(2)
No Less than 3 ftof working
clearance in frontof the equipment.
ArchitecturalBarrier is illegally
located in the“Dedicated
Equipment Space”
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 13
Copyright 1999-2015 Dan Dudley
Framing member isa permanent
support
Terminationlocation is through
front panel
110.26(F)(2)
No Less than 3 ftof working
clearance in frontof the equipment.
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 14
Copyright 1999-2015 Dan Dudley
Not a GroundedReceptacle
Not GFCI protected
Enclosure notlisted and/or
labeled for the use
Receptacle notmounted properly
ImproperConductorEntrance
Conductor notproperly secured
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 15
Copyright 1999-2015 Dan DudleyPlumbing Elbows ??
Plumbing pipe andfittings are notapproved as araceway forconductors.
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 16
Copyright 1999-2015 Dan Dudley
What the heck,they won’t everneed to use thatfire escape ??!!
225.7(C)“…Not less than 3ft from windows,
platforms, fireescapes and the
like…”
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 17
Copyright 1999-2015 Dan Dudley
This truck won’t ever be moved ??
PortableServce
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 18
Copyright 1999-2015 Dan Dudley
Individual InsulatedConductors are onlyallowed in Dwellings
if they are in aRaceway.
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 19
Copyright 1999-2015 Dan Dudley
Exam – vs – Field Experience
• The following slides are information asked on over 90% of the variouselectrical exams across the U.S.
• Jobs electricians perform everyday with the test related questionsand key information points
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 20
Copyright 1999-2015 Dan Dudley
Door must open90 degrees
Four things usually asked:
Headroom 6 1/2ft
Space in front 3ft
Working clearance ≥ 30in
Door open ≥ 90 degrees
≥ = “not less than”
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 21
Copyright 1999-2015 Dan Dudley
Article 110.26(A)(2), (3), (E)
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 22
Copyright 1999-2015 Dan Dudley
Different System Grounded Conductors
NEC Section 200.6(A) & (B)
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 23
Copyright 1999-2015 Dan Dudley
Multiwire Circuits – More than one Voltage System
NEC Section 210.5 (C)(3)
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 24
Copyright 1999-2015 Dan Dudley
250.53(A)(3)
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 30
Copyright 1999-2015 Dan Dudley
250.53(A)(2)
(2) Supplemental Electrode Required. A single rod, pipe,or plate electrode shall be supplemented by an additionalelectrode of a type specified in 250.52(A)(2) through(A)(8). The supplemental electrode shall be permitted to bebonded to one of the following:(1) Rod, pipe, or plate electrode(2) Grounding electrode conductor(3) Grounded service-entrance conductor(4) Nonflexible grounded service raceway(5) Any grounded service enclosure
Exception: If a single rod, pipe, or plate grounding electrodehas a resistance to earth of 25 ohms or less, thesupplemental electrode shall not be required.
(3) Supplemental Electrode. If multiple rod, pipe, or plateelectrodes are installed to meet the requirements of thissection, they shall not be less than 1.8 m (6 ft) apart.
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 32
Copyright 1999-2015 Dan Dudley
250.52(3)
“UFER” orConcreteEncasedElectrode
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 33
Copyright 1999-2015 Dan Dudley
250.52(B)(2)
250.52(A)(5)
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 35
Copyright 1999-2015 Dan Dudley
250.66(A)
•Connections to Rod, Pipe, or Plate Electrodes.Where the grounding electrode conductor isconnected to rod, pipe, or plate electrodes aspermitted in 250.52(A)(5) or (A)(7), that portionof the conductor that is the sole connection tothe grounding electrode shall not be requiredto be larger than 6 AWG copper wire or 4AWG aluminum wire.
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 43
Copyright 1999-2015 Dan Dudley
Not enoughsurface area incontact to carry
fault current
250.92(B)
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 45
Copyright 1999-2015 Dan Dudley
Various methodsof bonding
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 46
Copyright 1999-2015 Dan Dudley
Service Bonding
Article 250.92(A) & (B)
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 47
Copyright 1999-2015 Dan Dudley
Zinc Plated – Pan Headself tapping screws arenot listed for grounding
250.8(A)
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 48
Copyright 1999-2015 Dan Dudley
General Wiring MethodsNEC 518.4(A)
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 49
Copyright 1999-2015 Dan Dudley
Article 300.14
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 54
Copyright 1999-2015 Dan Dudley
2014 NEC change: Max number ofreceptacles on branch circuits otherthan general lighting and outlet circuits
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 60
Copyright 1999-2015 Dan Dudley
Number of Circuits Commercial Buildings
Article 220.18
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 61
Copyright 1999-2015 Dan DudleyNote use of 60°C ampacity of #6 THHN
210.20(a)
60 A Protection Device
#6 AWG THHN Cu
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 62
Copyright 1999-2015 Dan Dudley
30 amp single itemcircuit =80%
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 63
Copyright 1999-2015 Dan DudleyArticle 210.12(b)
All 120-volt, singlephase, 15- and 20-
ampere branchcircuits supplyingoutlets installed indwelling unit family
rooms, dining rooms,living rooms, parlors,
libraries, dens,bedrooms, sunrooms,
recreation rooms,closets, hallways, or
similar rooms orareas shall be
protected by a listedarc-fault circuit
interrupter,combination-type,installed to provideprotection of thebranch circuit.
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 65
Copyright 1999-2015 Dan Dudley
230.24(A)Exceptions1,2 and 3
8/29/2016 Copyright 2016 Dan Dudley & Associates Page 71