VariableARK
join:2003-03-17
USA
| reply to nunya
Re: tower conduit
Does this sounds like an apt description of what needs to be done?
"Ground the antenna cables on the top to a common ground wire that runs down to the main box where the ethernet cables are ground and that ground is bonded to the electrical ground as well as it has its own ground rod." |
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nunya
SEE ROCK CITY 475 MILES
Premium,MVM
join:2000-12-23
O Fallon, MO
clubs: | reply to VariableARK
Absolutely. |
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VariableARK
join:2003-03-17
USA | reply to nunya
Does that mean I should put a new ground in AND connect that ground to the common electrical system ground as well? |
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nunya
SEE ROCK CITY 475 MILES
Premium,MVM
join:2000-12-23
O Fallon, MO
clubs: | reply to VariableARK
Bond Bond Bond Bond and Ground Ground Ground Ground. |
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VariableARK
join:2003-03-17
USA | reply to Splitpair
I am putting my equipment box at the base of the tower. Should I bond the equipment on the top to the electrical ground or should I put a new grounding rod in? |
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Splitpair
Premium
join:2000-07-29
Cow Towne
 ·T-Mobile US
| reply to VariableARK
said by VariableARK  :What fittings would I use to seal the steel conduit? The screw down type certainly is not water tight. For that application you want steel not cast zinc compression connectors and depending on the length of the run you may need to allow a gap in the run or use an expansion coupler or two.
Wayne
--
If you cannot fix it with a buttset and some beanies you ain't a technician |
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Splitpair
Premium
join:2000-07-29
Cow Towne
·T-Mobile US
| reply to VariableARK
You could always hire this guy. 
Wayne |
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nunya
SEE ROCK CITY 475 MILES
Premium,MVM
join:2000-12-23
O Fallon, MO
clubs:
 ·AT&T CallVantage
| reply to VariableARK
On this type installation, for flexible conduit (if needed) you would want to use LFMC (liquidtight flexible metallic conduit). You want the metallic innards for shielding / bonding / physical protection.
--
Looks like Reverend Wright got his wish - God Damn America. |
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John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp
 ·CenturyLink
| reply to VariableARK
said by VariableARK :What fittings would I use to seal the steel conduit? The screw down type certainly is not water tight. Compression couplers ARE raintight.
Thomas & Betts and Steel City are most widely available.
I would suggest that you use EMT if permanence is required.
Paint it -before- you put it up...far easier!
--
A is A |
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Killa200
Premium
join:2005-12-02
Spring City, TN
1 edit | reply to VariableARK
Liquid Tight - Non Metallic
The rating is used on the box, connections, and flex / non flex conduit as well. But its definitely the rating i'd be looking for on this project. |
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VariableARK
join:2003-03-17
USA | reply to AMD Phreak
What does LTNM stand for? Is that the liquid tight box terminator/connector? |
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AMD Phreak
Premium
join:2003-12-14
| reply to VariableARK
I would personally transition for the reason I listed earlier and that is for thermal expansion of the joints. It will make it easier to work with as well I think.
At least, this is how I would do it.... 
Nunya has more experience in conduit than I however.
--
"No job is so important, and no service is so urgent that we cannot take the time to perform our work safely."
-- AT&T, Your World, Destroyed.
--Safety One Tower Rescue Certified
--LLigetfa:"Wimax is like teenage sex. Everyone talks about doing it." |
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AMD Phreak
Premium
join:2003-12-14
| reply to VariableARK
I see Graybar lists Steel city in the catalog but there are other mfgs, part description is metallic straight liquid tight connector. Nunya listed what is called a Myers Watertight Hub.
He also referenced I think, what is called an LB, for the lower portion just as you sweep off the tower and transition into the flex. You could do it either way I suppose; go right from EMT to LTNM or use the LB and transition that way.
What ever you do make sure you use clamps and #6 ground wire to bond across each joint on the EMT on the way up to ensure 100% electrical continuity for grounding purposes. Also at the top where you enter the box bond the conduit to the box there.
You need to bond the bottom of the conduit just before you sweep off the tower, this will be the only bond you have on the conduit at the base.
--
"No job is so important, and no service is so urgent that we cannot take the time to perform our work safely."
-- AT&T, Your World, Destroyed.
--Safety One Tower Rescue Certified
--LLigetfa:"Wimax is like teenage sex. Everyone talks about doing it." |
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VariableARK
join:2003-03-17
USA | reply to nunya
Why transition at all? Is there a reason not to run EMT all the way from box to box? What do you mean by tray? I take it the T&B H200TB is a box termination for the lfmc not for emt? |
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nunya
SEE ROCK CITY 475 MILES
Premium,MVM
join:2000-12-23
O Fallon, MO
clubs:
·AT&T CallVantage
| reply to VariableARK
Just make sure your couplings and connectors are listed as "Rain Tight".
Pluggable conduit sealing bodies are also available (and expensive) to keep water out of your equipment.
If you are using EMT on the verticals, you might want to consider LFMC on the tray. I'd transition from EMT to LFMC with straight pull bodies.
If you are running in to 2" knockouts, use a Crouse Hinds ST-6 or T&B H200TB. Either will work (2" threaded hub).
--
Looks like Reverend Wright got his wish - God Damn America. |
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AMD Phreak
Premium
join:2003-12-14 | reply to VariableARK
There are special hubs you use to transition from LTNM to box. I will get you part numbers when I get in the office. |
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VariableARK
join:2003-03-17
USA
| reply to AMD Phreak
I just checked the diameter, 1.5" is tight, so I am going to go with 2". May as well do emt. So the compression couplers are waterproof?- I did not know that. It is running to a small nema4 enclosure on the top and then a larger nema4 enclosure (actual pop) on the bottom, it is a straight vertical run. I assume just make sure I get compression fittings for the box entries as well and the thing will be watertight? |
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nunya
SEE ROCK CITY 475 MILES
Premium,MVM
join:2000-12-23
O Fallon, MO
clubs: | reply to keefe007
Forgot all about that. Yes, you can get LFMC in white (as well as many other colors).
--
Looks like Reverend Wright got his wish - God Damn America. |
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keefe007
Premium
join:2004-02-24
Germantown, WI
2 edits | reply to VariableARK
You might be able to find Sealtight or "liquid tight flexible metal conduit" in white instead of the traditional gray. I know for sure that you can find white PVC flexible conduit/interduct. |
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nunya
SEE ROCK CITY 475 MILES
Premium,MVM
join:2000-12-23
O Fallon, MO
clubs:
·AT&T CallVantage
| reply to VariableARK
Plumbing pipe is a no-go. 1) It's a code violation, 2) Plumbing PVC is normally NOT UV resistant.
Electrical PVC must be sunlight resistant. If you must use PVC, use schedule 80.
EMT with compression couplings would be better.
IMC or RMC with threaded couplings would be the best. I would suggest aluminum due to the weight. Both are very heavy in steel.
I spray mine on the ground the day before and just paint the joints and scratches as I go.
--
Looks like Reverend Wright got his wish - God Damn America. |
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