ECN Forum Forums General Topics of the Trade General Discussion Area Ask me anything?

Q: "In a basement you have 2 exits does code require lights to be on 3, ways"

A: On the exterior entrance and exits lights
at each man door with their own wall
switchs or motion.

A: On the interior only on the stairways with six risers or more and landing level with entry shall REQUIER threeway.

I'll take a shot Roger
1.No #2 220.22
2.A
3.C
4.True
5.1/0 Feeders #20 Lighting fixture wires

Q: When wiring an Elevator when and why do you a Shunt Trip Breaker?

A: when their is an application of water via sprinklers in pit or machine room and the like.


But thats a gess i didn't really find much.

Q: "How many breakers are allowed in an out building sub panel before you need a main disconnect on that sub panel."

A: A little tricky their dave. if its a seperate building you need a main no mater how meny breakers.

Bucket: Try the "how many breakers" question one more time. Are you in article 225?

What is the minimum size conductor needed to connect the secondary of a transformer to a panel with a 400 amp main breaker.

Bucketman
How about an answer. 01/12/05

[This message has been edited by Bob (edited 01-11-2005).]

[This message has been edited by Bob (edited 01-12-2005).]

Here's an easy one for Bucketman:

Which NEC Section/Article states the correct Ground-Pin orientation of a Receptacle?

... Just kidding!!

Here is the real Q:

Which of these Seperately Derived Systems (SDS) may use the OCPD on the Primary side to protect the Secondary side feeders - and why? :

<OL TYPE=A>

[*] 480 VAC Pri. x 120 VAC Sec. 1 Phase 2 Wire,

[*] 240 VAC Pri. X 600 VAC Sec. 1 Phase 2 Wire,

[*] 600 VAC Pri. X 120/240 VAC Sec. 1 Phase 3 Wire,

[*] 480 VAC Pri. X 208Y/120 VAC Sec. 3 Phase 4 Wire,

[*] 240 VAC Pri. X 600 VAC Sec. 3 Phase 3 Wire,

[*] 600 VAC Pri. X 120/240 VAC Sec. 3 Phase 4 Wire.
</OL>

All Transformers are Isolated types (Primary-Secondary windings Isolated), and are sizes between 37.5 and 45 KVA.

***NOTE***

*VAC = Volts, Alternating Current,
* Pri. = Primary,
* Sec. = Secondary.

This one is a piece of cake!

Scott35

1. What does "BIL" mean?

2. Where can I find a balustrade?

3. When are starwashers permitted to be used?

1) Basic insulation level

2) On a stairway or balcony

3) When Orion's Belt gets dirty

Here are the answers to my questions from yesterday with the questions reposted.

#1 You go on a service call for fixtures not working on outside light poles for a car lot. The problem is a bad time clock feeding a contactor so you replace it. While you were investigating the problem you see these poles are fed with (9) 20 amp circuits from a 120/208 v service .
Now you find that all these circuits share (1) #6 THHN neutral, is this legal?

Yes
No

#2 In a dwelling unit you can install _______ receptacles on a 15 amp circuit.

A 10
B 13
C As many as you can carry in a wheelbarrow
D There is no limit

#3 Which of the following statements about the Grounding Electrode Conductor
(GEC) is false?

A It must be green or marked green
B It must be sized per article 250.66
C It can be orange
D It can be copper, aluminum, or copper clad aluminum

#4 Before the 2002 code gray could be used for an ungrounded (hot) conductor.

True
False

#5 The smallest wire that is allowed to be run in parallel per the NEC is

A 1/0
B #1
C #20
D 500 MCM


Answers ;

#1 Yes, see 225.7(B)

#2 D, 220.3(B)(10) although there is a minimum number of circuits to serve the square footage and the required circuits per article 210, there is no limit to the number of receptacles that can be on each
circuit.

#3 A, see 250.62 note there is no color required and in fact it can be any color except “white or gray” see 200.7 (A)

#4 True, see that the NEC recognizes this in the FPN under 200.10(D)

#5 C, see 620.12(A)(1)



(edited to correct spacing)

Roger



[This message has been edited by Roger (edited 01-11-2005).]