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Milbank 217MTB-48 – Frequently Asked Questions
1) What's the difference between the 4, 5 and 7 terminal versions of the Milbank MTB/48-100 meter socket?
Terminal count has to match what your utility specifies for the service being metered. The MTB/48-100 is offered in 4, 5 and 7 terminal configurations. A 4-terminal jaw arrangement is the common single-phase 3-wire setup, 5-terminal adds a jaw for network or 3-wire single-phase applications that need it, and 7-terminal covers 3-phase 4-wire self-contained metering. Utilities publish an approved meter socket list, so pick the terminal count off that list rather than off the panel you are replacing.
2) Can the Milbank MTB/48-100 be used for an underground service lateral, or is it overhead only?
Both are covered, but they are different part numbers. Overhead-only versions carry the 2-series numbers such as 215MTB-48 and 217MTB-48. The combination overhead and underground versions carry a U prefix, like U214MTB-48 and U217MTB-48, and those are the ones to order when the service conductors come up from below or when you want the flexibility to feed either way. Ordering the plain overhead version for an underground lateral leaves you without the bottom hub provision.
3) Which Milbank MTB/48-100 part number do I order for a 3-phase underground service?
U217MTB-48 is the 7-terminal combination overhead and underground version, and 7-terminal is the self-contained 3-phase 4-wire arrangement. If the lateral is overhead only, 217MTB-48 is the equivalent 7-terminal part.
4) Does the Milbank MTB/48-100 meter socket include a main breaker, or do I add one?
It is a main breaker socket rated 1 to 100 amperes, so the enclosure is built to accept a breaker in that range. The breaker itself is a separate item matched to the utility and to the panel manufacturer being fed, so specify the amperage and the breaker type you need alongside the socket.
5) What does ring-type mean on a Milbank meter socket, and will my utility accept it?
Ring-type means the meter is held in by a sealing ring around the meter rim, which the utility seals after inspection. The MTB/48-100 is a ring-type socket. Some utilities require ringless sockets with a removable cover instead, and the two are not interchangeable once the meter is set, so confirm which style your serving utility lists as approved before you order.
6) What is the lever bypass on this Milbank socket for?
Lever bypass lets the utility or a qualified electrician shunt the meter jaws so the meter can be pulled and replaced without dropping power to the load. On the MTB/48-100 that bypass is built in, which is why many utilities require it on residential and light commercial services where continuity matters. It is a maintenance feature, not a disconnect, and it should only be operated by personnel authorized by the utility.
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Does the Milbank 217MTB-48 come with a warranty?
Absolutely. The Milbank 217MTB-48 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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