Oscar_Lives posted for all of us...
I don't top post - see either inline or at bottom.
Thank you. It is a perfect opportunity to discuss copper tubing fuses. Oh
wait a minute I must digress... First we must touch upon Stumpy. The parallel
parts of him are his mouth and asshole. Now the problem is what is coming out
of these? In the final analysis what one must conclude that stupidity is
secondary to idiocy.
Joseph, I hope I have helped to enlighten you in some small and humble way. If
I can be of further service to you please don't hesitate to ask.
I must ask though did this hotel have rooms rented by the hour? Was it's name
the "Come & Go"? Maybe the "Hot Sheets"? I did not stay at Holiday Inn
Express lat night.
That can depend a lot on where it is and what it's used for...
Since it is marked, I'd assume it is either on a piece of equipment or
in a distribution system.
Generally... if they're marked... it means the system is utilizing a
'auto transformer' specifically wired for good voltage regulation.
This happens a lot in higher end 'boost' transformers. A lot of
audio-type systems use a parallel secondary.
Series (primary)/Parallel (secondary) transformers are common in
industrial settings. A 480 x 240 V transformer (with 120V taps) is wired
this way... although seldom marked. I've used some bigger ones to go
460-600 and 460-380.
What kind of equipment is connected to it?
Its the incoming service on a 3 story hotel building. There are couple of
clearly identifiable transformers and a couple of other boxes that are the feed
the entire building. I think there were two or three clearly stamped Parallel
So a Secondary parallel means multi-taps on a transformer. e.g. 1-460v,
two parallel taps of 230v, 3ph? Or is this a way of taking 460v, 1ph and making
230v, 3ph? I was imagining it to be a double wrapped transformer? I haven't
researched any of this just yet; I was just curious and lazy, thanks for the
No it means that transformer have dual winnings on secondary
and are parallel to increase current
multi-taps can not be parallel on any transformer
on ones I came across from 5vac to 5kvac
e.g. 1-460v, 3ph to
Ahhh... a hotel. That may explain the system and why they are marked
this way. Many local code variations require high-density multiple
occupancy dwellings to have backup power in some flavor.
Sometimes... this is accomplished by numerous means. For example, the
building can have two separate primary feeds.. from different
locations... servicing the buildings. Two different sets of transformers
may supply secondary power (in parallel). I've mostly seen this done at
high rise buildings and large prisons.
Building owners (with generation capability) have also embraced DG
(Distributed Generation) as a way to help with their energy costs. Their
own generators can be fired off and help meet network demands upstream
at a premium cost to the utility. DG may require parallel secondary
circuits in order to properly 'upload' energy to the system in need.
The key is that this equipment is marked as such. A regular distribution
transformer... which may very well have its own secondaries in
parallel... is a common occurrence and no-one would bother. Marking one
like this is warning to the service personnel that other sources of
energy probably exist outside the transformer's own primary circuit.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.