Metal pole lights

[Cavie]

I see Dept. of Public Works people installing and maintaining traffic signal lights. If I knew

the answer I wouldn't of asked the question, "Why wouldn't they be ".

Are Railroad crossing lights under the NEC ?

The only thing getting inspected is the service. This is required by the power company. Florida street lighting and signals are being metered. They are requireing the 480 volt to ground services to have a disconect on the line side of the meter which brings up the question "Where is the first means of disconect." I'll find out the answer to that question this week.

 

[benaround]

The only thing getting inspected is the service. This is required by the power company. Florida street lighting and signals are being metered. They are requireing the 480 volt to ground services to have a disconect on the line side of the meter which brings up the question "Where is the first means of disconect." I'll find out the answer to that question this week.

Thank You.

 

[480sparky]

What I didn't like is that the question didn't really have anything to do with the answer. You could have just as simply say if you ran #8's on a 20 amp circuit, what size equipment grounding condutor do you need........

Now for the wierd part.... if that same circuit was on a 40-amp breaker, the ground would only need to be 10.

Go figure.

 

[hillbilly]

Now for the wierd part.... if that same circuit was on a 40-amp breaker, the ground would only need to be 10.

Go figure.

I agree, that's a little confusing.
250.122(B) could use a little more clarification...IMO.

It says "where ungrounded conductors are increased in size, the equipment grounding conductors shall be increased in size proportionally".

In the test question, if this is a new circuit, the ungrounded conductors weren't increased in size, that's the size they were originally.:smile:
Why? Doesn't matter (to me), that's what was used.
Maybe that's all the Installer had.

That's a play on words, as I'm sure that the code is speaking of the size of conductors that "could have/should/have" been used in the first place.
Since you could have used #12 (using the OP's info), when you went to #8, you had to increase the GEC size to match it.
I suppose it has something to do with voltage drop.

If this had been a circuit that required 40 Amps, the #8 would have been OK with a #10 GEC.

Confusing enough?:smile:

steve

 

[cowboyjwc]

Pretty much what all test are about...no?

I always thought it was to see if you knew the answer to the information you were being taught.:smile: If it's an open book test here the poor guy is looking into light poles and what not and wasting time chasing an answer.

Now for the wierd part.... if that same circuit was on a 40-amp breaker, the ground would only need to be 10.

Go figure.

That is correct.

 

[Cavie]

The only thing getting inspected is the service. This is required by the power company. Florida street lighting and signals are being metered. They are requireing the 480 volt to ground services to have a disconect on the line side of the meter which brings up the question "Where is the first means of disconect." I'll find out the answer to that question this week.

The powers to be in Lee county decided that the dicsconect on the line side of the meter is not the first means of disconect. Bonding will take place a usuall in the metercan and seperate at the main.